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Add Java implementations of Result, Maybe, Either #2

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Add Java implementations of Result, Maybe, Either #2

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94f74de
Add Result implementation in Java
mari4kaa Jun 18, 2025
3b5a0df
Add Either implementation in Java
mari4kaa Jun 18, 2025
4727421
Add Maybe implementation in Java
mari4kaa Jun 18, 2025
9254e0e
Add one more usage example of Result
mari4kaa Jun 18, 2025
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Add one more usage example of Result
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@mari4kaa
mari4kaa committed Jun 18, 2025
commit 9254e0e2c6d8887c0fed401089cc1410399165dc
4 changes: 2 additions & 2 deletions Java/Result/Result.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ public static <T> Result<T, Exception> fromValue(T value) {
return new Result<>(value, null);
}

public static <E extends Exception> Result<Void, E> fromError(E error) {
public static <T, E extends Exception> Result<T, E> fromError(E error) {
return new Result<>(null, error);
}

Expand All @@ -36,4 +36,4 @@ public T getValue() {
public E getError() {
return error;
}
}
}
30 changes: 28 additions & 2 deletions Java/Result/ResultUsage.java
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
public class ResultUsage {
public static void main(String[] args) {
// Usage
// Basic usage
Result<String, Exception> success = Result.create("Successfully received data");
Result<String, Exception> failure = Result.create(new Exception("Network error"));

Expand All @@ -11,5 +11,31 @@ public static void main(String[] args) {
if (failure.isError()) {
System.out.println("Failure: " + failure.getError().getMessage());
}

// Additional usage example
// Handling a method that may throw and wrapping the result
Result<Integer, Exception> result1 = parseIntSafe("123");
Result<Integer, Exception> result2 = parseIntSafe("abc");

if (result1.isSuccess()) {
System.out.println("Parsed value: " + result1.getValue());
} else {
System.out.println("Parse error: " + result1.getError().getMessage());
}

if (result2.isSuccess()) {
System.out.println("Parsed value: " + result2.getValue());
} else {
System.out.println("Parse error: " + result2.getError().getMessage());
}
}

public static Result<Integer, Exception> parseIntSafe(String input) {
try {
int value = Integer.parseInt(input);
return Result.fromValue(value);
} catch (Exception e) {
return Result.fromError(e);
}
}
}
}