diff --git a/.gitignore b/.gitignore index cc26017..b63da45 100644 --- a/.gitignore +++ b/.gitignore @@ -1,79 +1,42 @@ -### JetBrains template -# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider -# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839 - -# User-specific stuff -.idea/**/workspace.xml -.idea/**/tasks.xml -.idea/**/usage.statistics.xml -.idea/**/dictionaries -.idea/**/shelf - -# AWS User-specific -.idea/**/aws.xml - -# Generated files -.idea/**/contentModel.xml - -# Sensitive or high-churn files -.idea/**/dataSources/ -.idea/**/dataSources.ids -.idea/**/dataSources.local.xml -.idea/**/sqlDataSources.xml -.idea/**/dynamic.xml -.idea/**/uiDesigner.xml -.idea/**/dbnavigator.xml - -# Gradle -.idea/**/gradle.xml -.idea/**/libraries - -# Gradle and Maven with auto-import -# When using Gradle or Maven with auto-import, you should exclude module files, -# since they will be recreated, and may cause churn. Uncomment if using -# auto-import. -# .idea/artifacts -# .idea/compiler.xml -# .idea/jarRepositories.xml -# .idea/modules.xml -# .idea/*.iml -# .idea/modules -# *.iml -# *.ipr - -# CMake -cmake-build-*/ - -# Mongo Explorer plugin -.idea/**/mongoSettings.xml - -# File-based project format +.gradle +build/ +!gradle/wrapper/gradle-wrapper.jar +!**/src/main/**/build/ +!**/src/test/**/build/ + +### IntelliJ IDEA ### +.idea/modules.xml +.idea/jarRepositories.xml +.idea/compiler.xml +.idea/libraries/ *.iws - -# IntelliJ +*.iml +*.ipr out/ - -# mpeltonen/sbt-idea plugin -.idea_modules/ - -# JIRA plugin -atlassian-ide-plugin.xml - -# Cursive Clojure plugin -.idea/replstate.xml - -# SonarLint plugin -.idea/sonarlint/ - -# Crashlytics plugin (for Android Studio and IntelliJ) -com_crashlytics_export_strings.xml -crashlytics.properties -crashlytics-build.properties -fabric.properties - -# Editor-based Rest Client -.idea/httpRequests - -# Android studio 3.1+ serialized cache file -.idea/caches/build_file_checksums.ser - +!**/src/main/**/out/ +!**/src/test/**/out/ + +### Eclipse ### +.apt_generated +.classpath +.factorypath +.project +.settings +.springBeans +.sts4-cache +bin/ +!**/src/main/**/bin/ +!**/src/test/**/bin/ + +### NetBeans ### +/nbproject/private/ +/nbbuild/ +/dist/ +/nbdist/ +/.nb-gradle/ + +### VS Code ### +.vscode/ + +### Mac OS ### +.DS_Store \ No newline at end of file diff --git a/.idea/java-network-study.iml b/.idea/java-network-study.iml deleted file mode 100644 index d6ebd48..0000000 --- a/.idea/java-network-study.iml +++ /dev/null @@ -1,9 +0,0 @@ - - - - - - - - - \ No newline at end of file diff --git a/build.gradle b/build.gradle new file mode 100644 index 0000000..f7beddb --- /dev/null +++ b/build.gradle @@ -0,0 +1,19 @@ +plugins { + id 'java' +} + +group = 'org.example' +version = '1.0-SNAPSHOT' + +repositories { + mavenCentral() +} + +dependencies { + testImplementation platform('org.junit:junit-bom:5.9.1') + testImplementation 'org.junit.jupiter:junit-jupiter' +} + +test { + useJUnitPlatform() +} \ No newline at end of file diff --git "a/[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" "b/docs/[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" similarity index 99% rename from "[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" rename to "docs/[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" index 3120796..39f0286 100644 --- "a/[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" +++ "b/docs/[1-week]\353\204\244\355\212\270\354\233\214\355\201\254-\352\270\260\354\264\210_thread.md" @@ -780,7 +780,7 @@ class ThreadLocalTest { 프린터 큐를 예시로 들어 FIFO 에 대해서 알고 있다. ```java -package org.example.fifo; +package org.example.ch1.fifo; import java.util.LinkedList; import java.util.NoSuchElementException; @@ -821,7 +821,7 @@ public class JobQueue { } } - public void put(Object o){ + public void put(Object o) { synchronized (monitor) { jobs.addLast(o); monitor.notify(); @@ -847,9 +847,7 @@ public class JobQueue { ``` ```java -package org.example.fifo; - -import java.util.Queue; +package org.example.ch1.fifo; class Consumer implements Runnable { private JobQueue queue = null; @@ -877,10 +875,10 @@ class Consumer implements Runnable { ``` ```java -package org.example.fifo; +package org.example.ch1.fifo; class Producer implements Runnable { - private JobQueue queue = null; + private JobQueue queue = null; public Producer(JobQueue queue) { this.queue = queue; diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..249e583 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..a01a0c3 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,6 @@ +#Wed Oct 04 16:36:16 KST 2023 +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100755 index 0000000..1b6c787 --- /dev/null +++ b/gradlew @@ -0,0 +1,234 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit + +APP_NAME="Gradle" +APP_BASE_NAME=${0##*/} + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..107acd3 --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,89 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto execute + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/settings.gradle b/settings.gradle new file mode 100644 index 0000000..d82b992 --- /dev/null +++ b/settings.gradle @@ -0,0 +1,2 @@ +rootProject.name = 'java-network-study' + diff --git a/src/main/java/org/example/ch1/AdvancedStopThread.java b/src/main/java/org/example/ch1/AdvancedStopThread.java new file mode 100644 index 0000000..312a930 --- /dev/null +++ b/src/main/java/org/example/ch1/AdvancedStopThread.java @@ -0,0 +1,29 @@ +package org.example.ch1; + +public class AdvancedStopThread implements Runnable { + + public static void main(String[] args) throws InterruptedException { + AdvancedStopThread ast = new AdvancedStopThread(); + Thread thread = new Thread(ast); + thread.start(); + + Thread.sleep(1000); + + thread.interrupt(); + } + + @Override + public void run() { + try { + while (!Thread.currentThread().isInterrupted()) { + System.out.println("Thread is alive.."); + // 0.5초 멈춘다 + Thread.sleep(500); + } + } catch (InterruptedException e) { + + } finally { + System.out.println("Thread is dead..."); + } + } +} \ No newline at end of file diff --git a/src/main/java/org/example/ch1/DaemonThread.java b/src/main/java/org/example/ch1/DaemonThread.java new file mode 100644 index 0000000..178c9e4 --- /dev/null +++ b/src/main/java/org/example/ch1/DaemonThread.java @@ -0,0 +1,23 @@ +package org.example.ch1; + +class DaemonThread { + + public static void main(String[] args) { + Thread t = new Thread() { + @Override + public void run() { + try { + Thread.sleep(5000); + System.out.println("MyThread 종료"); + } catch (InterruptedException e) { + + } + } + }; + // 데몬스레드 설정 + t.setDaemon(true); + t.start(); + + System.out.println("Main() 종료"); + } +} diff --git a/src/main/java/org/example/ch1/Main.java b/src/main/java/org/example/ch1/Main.java new file mode 100644 index 0000000..b3d72f3 --- /dev/null +++ b/src/main/java/org/example/ch1/Main.java @@ -0,0 +1,54 @@ +package org.example.ch1; + +public class Main { + + public static void main(String[] args) { + + Main stopThread = new Main(); + stopThread.process(); + } + + public void process() { + // StopThread 인스턴스를 생성한 후 이 인자를 파라미터로 받는 스레드 인스턴스를 생성한 후에 출발 + StopThread st = new StopThread(); + Thread thread = new Thread(st); + thread.start(); + try { + Thread.sleep(1000); + } catch (InterruptedException e) { + e.printStackTrace(); + } + st.stop(); + } + + class StopThread implements Runnable { + private boolean stoped = false; + + @Override + public void run() { + while (!stoped) { + System.out.println("Thread is alive ... "); + // 0.5초 간 멈춘다. + try { + Thread.sleep(500); + } catch (InterruptedException e) { + e.printStackTrace(); + } + } + System.out.println("Thread is dead..."); + } + + public void stop() { + stoped = true; + } + } +} + + +// public static void propagateException() throws InterruptedException { +// Thread.sleep(1000); +// Thread.currentThread().interrupt(); +// if (Thread.interrupted()) { +// throw new InterruptedException(); +// } +// } diff --git a/src/main/java/org/example/ch1/NormalThread.java b/src/main/java/org/example/ch1/NormalThread.java new file mode 100644 index 0000000..1d3a72d --- /dev/null +++ b/src/main/java/org/example/ch1/NormalThread.java @@ -0,0 +1,21 @@ +package org.example.ch1; + +class NormalThread { + + public static void main(String[] args) { + Thread t = new Thread() { + @Override + public void run() { + try { + Thread.sleep(1000); + System.out.println("MyThread 종료"); + } catch (InterruptedException e) { + + } + } + }; + t.start(); + + System.out.println("Main() 종료"); + } +} diff --git a/src/main/java/org/example/ch1/PriorityThread.java b/src/main/java/org/example/ch1/PriorityThread.java new file mode 100644 index 0000000..41565b2 --- /dev/null +++ b/src/main/java/org/example/ch1/PriorityThread.java @@ -0,0 +1,39 @@ +package org.example.ch1; + +public class PriorityThread implements Runnable { + + public static void main(String[] args) throws InterruptedException { + System.out.println("Start main"); + + Thread t = new Thread(new PriorityThread()); + t.start(); + Thread.sleep(500); + + t.setPriority(Thread.MIN_PRIORITY); + Thread.sleep(500); + + t.setPriority(8); + Thread.sleep(500); + + t.setPriority(10); + Thread.sleep(500); + + t.interrupt(); + + System.out.println("End Main"); + } + + @Override + public void run() { + try { + while (!Thread.currentThread().isInterrupted()) { + System.out.println("Priority : " + Thread.currentThread().getPriority()); + Thread.sleep(500); + } + } catch (InterruptedException e) { + + } finally { + System.out.println("Thread is dead..."); + } + } +} \ No newline at end of file diff --git a/src/main/java/org/example/ch1/ThreadGroup.java b/src/main/java/org/example/ch1/ThreadGroup.java new file mode 100644 index 0000000..b386da8 --- /dev/null +++ b/src/main/java/org/example/ch1/ThreadGroup.java @@ -0,0 +1,29 @@ +package org.example.ch1; + +class ThreadGroupTest { + + public static void main(String[] args) { + System.out.println("ThreadGroupTest: " + Thread.currentThread()); + + ThreadGroup tg1 = new ThreadGroup( + Thread.currentThread().getThreadGroup(), "ThreadGroup1" + ); + + ThreadGroup tg2 = new ThreadGroup("ThreadGroup2"); + ThreadGroup tg3 = new ThreadGroup(tg1, "ThreadGroup3"); + + Thread t1 = new Thread(tg1, "Thread-1"); + Thread t2 = new Thread(tg2, "Thread-2"); + Thread t3 = new Thread(tg3, "Thread-3"); + + System.out.println(" t1: " + t1); + System.out.println(" t2: " + t2); + System.out.println(" t3: " + t3); + System.out.println( + "main 스레드 그룹:" + Thread.currentThread().getThreadGroup() + ", 활동 중인 스레드 개수:" + Thread.currentThread().getThreadGroup().activeCount() + ", 활동중인 스레드 그룹 개수:" + Thread.currentThread().getThreadGroup().activeGroupCount() + ); + + Thread.currentThread().getThreadGroup().list(); + + } +} diff --git a/src/main/java/org/example/ch1/ThreadJoin.java b/src/main/java/org/example/ch1/ThreadJoin.java new file mode 100644 index 0000000..c793bed --- /dev/null +++ b/src/main/java/org/example/ch1/ThreadJoin.java @@ -0,0 +1,28 @@ +package org.example.ch1; + +class ThreadJoin { + + public static void main(String[] args) throws InterruptedException { + Thread t = new Thread() { + @Override + public void run() { + try { + Thread.sleep(2000); + System.out.println("MyThread 종료"); + Thread.sleep(3000); + } catch (InterruptedException e) { + } + } + }; + // 데몬스레드 설정 + t.start(); + +// try { + t.join(); +// } catch (InterruptedException e) { +// e.printStackTrace(); +// } + + System.out.println("Main() 종료"); + } +} diff --git a/src/main/java/org/example/ch1/ThreadLocalTest.java b/src/main/java/org/example/ch1/ThreadLocalTest.java new file mode 100644 index 0000000..a161b68 --- /dev/null +++ b/src/main/java/org/example/ch1/ThreadLocalTest.java @@ -0,0 +1,58 @@ +package org.example.ch1; + +import java.util.Random; + +class ThreadLocalTest { + + // 카운터 변수 생성 + static volatile int counter = 0; + + // 임의 클래스 생성 + static Random random = new Random(); + + // ThreadLocal 상속한 ThreadLocalObject 클래스 생성 + private static class ThreadLocalObject extends ThreadLocal { + Random random = new Random(); + // 초기값은 0~999 사이여야 한다. + + @Override + protected Object initialValue() { + return random.nextInt(1000); + } + } + + //ThreadLocal 변수 생성 + static ThreadLocal threadLocal = new ThreadLocalObject(); + + private static void displayValue() { + System.out.println("Thread Name:" + Thread.currentThread().getName() + + ", initialValue:" + threadLocal.get() + + ", counter:" + counter); + + } + + public static void main(String[] args) { + displayValue(); + + Runnable runnable = new Runnable() { + @Override + public void run() { + synchronized (ThreadLocalTest.class) { + counter++; + } + displayValue(); + try { + Thread.sleep((int) threadLocal.get()); + displayValue(); + }catch (InterruptedException e) { + e.printStackTrace(); + } + } + }; + + for (int i = 0; i < 3; i++) { + Thread t = new Thread(runnable); + t.start(); + } + } +} diff --git a/src/main/java/org/example/ch1/fifo/Consumer.java b/src/main/java/org/example/ch1/fifo/Consumer.java new file mode 100644 index 0000000..c14aa9a --- /dev/null +++ b/src/main/java/org/example/ch1/fifo/Consumer.java @@ -0,0 +1,25 @@ +package org.example.ch1.fifo; + +class Consumer implements Runnable { + private JobQueue queue = null; + private String name = null; + + public Consumer(JobQueue queue, String index) { + this.queue = queue; + this.name = "Consumer-" + index; + } + + @Override + public void run() { + System.out.println("[ Start " + name + "..."); + try { + while (!Thread.currentThread().isInterrupted()) { + System.out.println(name + " : " + queue.pop().toString()); + } + } catch (Exception e) { + e.printStackTrace(); + } finally { + System.out.println("[ End " + name + ".. ]"); + } + } +} diff --git a/src/main/java/org/example/ch1/fifo/JobQueue.java b/src/main/java/org/example/ch1/fifo/JobQueue.java new file mode 100644 index 0000000..65ba066 --- /dev/null +++ b/src/main/java/org/example/ch1/fifo/JobQueue.java @@ -0,0 +1,64 @@ +package org.example.ch1.fifo; + +import java.util.LinkedList; +import java.util.NoSuchElementException; + +public class JobQueue { + + private static final String NAME = "JOB QUEUE"; + private static final Object monitor = new Object(); + + private LinkedList jobs = new LinkedList(); + + // 하나의 객체만을 생성해서 사용할 수 있도록 싱글톤 패턴 사용 + private static JobQueue instance = new JobQueue(); + + private JobQueue() { + } + + public static JobQueue getInstance() { + if (instance == null) { + synchronized (JobQueue.class) { + instance = new JobQueue(); + } + } + return instance; + } + + public String getName() { + return NAME; + } + + public LinkedList getLinkedList() { + return jobs; + } + + public void clear() { + synchronized (monitor) { + jobs.clear(); + } + } + + public void put(Object o){ + synchronized (monitor) { + jobs.addLast(o); + monitor.notify(); + } + } + + public Object pop() throws InterruptedException { + Object o = null; + synchronized (monitor) { + if (jobs.isEmpty()) { + monitor.wait(); + } + o = jobs.removeFirst(); + } + if (o == null) throw new NoSuchElementException(); + return o; + } + + public int size() { + return jobs.size(); + } +} diff --git a/src/main/java/org/example/ch1/fifo/Producer.java b/src/main/java/org/example/ch1/fifo/Producer.java new file mode 100644 index 0000000..9fc0d99 --- /dev/null +++ b/src/main/java/org/example/ch1/fifo/Producer.java @@ -0,0 +1,24 @@ +package org.example.ch1.fifo; + +class Producer implements Runnable { + private JobQueue queue = null; + + public Producer(JobQueue queue) { + this.queue = queue; + } + + @Override + public void run() { + System.out.println("[ START PRODUCER...]"); + try { + int i = 0; + while (!Thread.currentThread().isInterrupted()) { + queue.put(Integer.toString(i++)); + } + } catch (Exception e) { + e.printStackTrace(); + } finally { + System.out.println("[ END PRODUCER.. ]"); + } + } +} diff --git a/src/main/java/org/example/ch1/fifo/Tester.java b/src/main/java/org/example/ch1/fifo/Tester.java new file mode 100644 index 0000000..9de474b --- /dev/null +++ b/src/main/java/org/example/ch1/fifo/Tester.java @@ -0,0 +1,32 @@ +package org.example.ch1.fifo; + +class Tester { + + public static void main(String[] args) throws InterruptedException { + JobQueue queue = JobQueue.getInstance(); + + //소비자 생성 후 시작 + Thread con1 = new Thread(new Consumer(queue, "1")); + Thread con2 = new Thread(new Consumer(queue, "2")); + Thread con3 = new Thread(new Consumer(queue, "3")); + con1.start(); + con2.start(); + con3.start(); + + //생성자 생성 후 시작 + Thread pro = new Thread(new Producer(queue)); + pro.start(); + + Thread.sleep(500); + // 생성자 종료 + pro.interrupt(); + + Thread.sleep(500); + // 소비자 종료 + con1.interrupt(); + con2.interrupt(); + con3.interrupt(); + + + } +} diff --git a/src/main/java/org/example/ch2/ChildTest.java b/src/main/java/org/example/ch2/ChildTest.java new file mode 100644 index 0000000..97242d0 --- /dev/null +++ b/src/main/java/org/example/ch2/ChildTest.java @@ -0,0 +1,51 @@ +package org.example.ch2; + +class ChildTest { + + class Parent2 { + int i = 7; + public int get() { + return i; + } + } + + class Child2 extends Parent2 { + int i = 5; + public int get() { + return i; + } + } + + public static void main(String[] args) { + ChildTest childTest = new ChildTest(); + childTest.execute(); + + + } + + private void execute() { + Parent2 p = new Parent2(); + System.out.println("--1--"); + System.out.println(p.i); + System.out.println(p.get()); + + Child2 c = new Child2(); + System.out.println("--2--"); + System.out.println(c.i); + System.out.println(c.get()); + + Parent2 p2 = new Child2(); + System.out.println("--3--"); + System.out.println(p2.i); + System.out.println(p2.get()); + + System.out.println("--4--"); + print(c); + print(p2); + } + + public static void print(Parent2 p) { + System.out.println(p.i); + System.out.println(p.get()); + } +} diff --git a/src/main/java/org/example/ch2/InheritanceTest.java b/src/main/java/org/example/ch2/InheritanceTest.java new file mode 100644 index 0000000..15e1b1c --- /dev/null +++ b/src/main/java/org/example/ch2/InheritanceTest.java @@ -0,0 +1,54 @@ +package org.example.ch2; + +class InheritanceTest { + + public static void main(String[] args) { + InheritanceTest inheritanceTest = new InheritanceTest(); + inheritanceTest.execute(); + } + + private void execute() { + FirstChild fc = new FirstChild(); + System.out.println(fc.read()); + + SecondChild sc = new SecondChild(); + System.out.println(sc.read()); + + ThirdChild tc1 = new ThirdChild(fc); + System.out.println(tc1.read()); + + ThirdChild tc2 = new ThirdChild(sc); + System.out.println(tc2.read()); + } + + class Parent { + + public String read() { + return "Parent 입니다"; + } + } + + public class FirstChild extends Parent { + public String read() { + return super.read() + ": firstChild"; + } + } + + class SecondChild extends Parent { + public String read() { + return super.read() + ": secondChild"; + } + } + + class ThirdChild extends Parent { + Parent p; + + public ThirdChild(Parent p) { + this.p = p; + } + + public String read() { + return p.read() + ": thirdChild"; + } + } +}