package com.java;

//file name: Main.java

class Base {

protected void foo() {

System.out.println("Base.foo()");

}

}

class Derived extends Base {

protected void foo() {

System.out.println("Derived.foo()");

}

}

public class Main {

public static void gfg(String s)

{

System.out.println("String");

}

public static void gfg(Object o)

{

System.out.println("Object");

}

/*public static void gfg(Integer i)

{

System.out.println("Integer");

} */

public static void main(String args[]) {

Derived d = new Derived();

d.foo();

gfg(null);

String s1 = "abc";

String s2 = s1;

s1 += "d";

System.out.println(s1 + " " + s2 + " " + (s1 == s2));

StringBuffer sb1 = new StringBuffer("abc");

StringBuffer sb2 = sb1;

sb1.append("d");

System.out.println(sb1 + " " + sb2 + " " + (sb1 == sb2));

}

}