java feature - checked versus unchecked exceptions / published by https://github.com/dacr/code-examples-manager #9cf3f47c-c240-4d2d-b5f6-8ab29b89c915/fdbcf0f54b4f543955be74399713e2fe8bab2146

JavaFeatureExceptionCheckedUnchecked.java

// summary : java feature - checked versus unchecked exceptions
// keywords : java, scalacli, checked, unchecked, exception, @testable
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : 9cf3f47c-c240-4d2d-b5f6-8ab29b89c915
// created-on : 2022-01-22T10:06:48+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

public class JavaFeatureExceptionCheckedUnchecked {
  // Any instances of java.lang.RuntimeException or java.lang.Error are unckecked exceptions
  // SO NO need to declare them in throws clauses
  static class MyUncheckedException1 extends java.lang.RuntimeException {
    public MyUncheckedException1(String message) {
      super(message);
    }
  }

  static class MyUncheckedException2 extends java.lang.Error {
    public MyUncheckedException2(String message) {
      super(message);
    }
  }

  static class MyCheckedException extends java.lang.Exception {
    public MyCheckedException(String message) {
      super(message);
    }
  }

  public static void println(String message) throws MyCheckedException {
    if (message == null) throw new MyUncheckedException1("is null");
    if (message.length() == 0) throw new MyUncheckedException2("is empty");
    if (message.equals("boum")) throw new MyCheckedException("bad message");
    System.out.println(message);
  }

  public static void main(String[] args) throws MyCheckedException {
    var message = "hello world";
    println(message);
  }
}