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

public class Test {
 public static void main(String[] args) {
 int x = 10;
 int y = 20;
 System.out.println(x + y);
 }
}

public class ArrayTest {
 public static void main(String[] args) {
 int[] arr = {1, 2, 3, 4, 5};
 for(int i: arr) {
 System.out.println(i);
 }
 }
}

public class ThreadTest extends Thread {
 public void run() {
 System.out.println('Thread is running.');
 }
 public static void main(String args[]) {
 ThreadTest t1 = new ThreadTest();
 t1.start();
 }
}

public class Student {
 private String name;
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
}

public class Test {
 public static void main(String[] args) {
 int x = 10;
 int y = x++ + ++x;
 System.out.println(y);
 }
}