public class HelloWorld {
 public static void main(String[] args) {
 System.out.println("Hello, World!");
 }
}

int x = 10;
int y = 20;
int z = y += x;

List numbers = Arrays.asList(1, 2, 3, 4, 5);
numbers.stream().filter(n -> n % 2 == 0).forEach(System.out::println);

public class MyRunnable implements Runnable {
 public void run() {
 System.out.println("Thread executed.");
 }
}
Thread thread = new Thread(new MyRunnable());
thread.start();

public class Person {
 private String name;
 public Person(String name) {
 this.name = name;
 }
 public String getName() {
 return name;
 }
}
Person person = new Person("John");
System.out.println(person.getName());

public class Test {
 public static void main(String[] args) {
 try {
 System.out.println("Hello World");
 throw new RuntimeException();
 } catch (RuntimeException e) {
 System.out.println("Caught RuntimeException");
 } finally {
 System.out.println("In finally block");
 }
 }
}