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10
package mypack; 
public class MyPackageClass {
 public void display() {
 System.out.println("Hello from MyPackageClass in mypack package!");
 }
}
package Programs; 
import mypack.MyPackageClass; 
public class Main {
 public static void main(String[] args) {
 MyPackageClass myPackageObj = new MyPackageClass();
 myPackageObj.display(); 
 }
}


11
class MyRunnable implements Runnable {
 public void run() {
 for (int i = 1; i <= 5; i++) {
 System.out.println("Thread " + Thread.currentThread().getId() + ": " + i);
 try {
 Thread.sleep(500); 
 } catch (InterruptedException e) {
 e.printStackTrace();
 }
 }
 }
}
public class Main {
 public static void main(String[] args) {
 MyRunnable myRunnable1 = new MyRunnable();
 MyRunnable myRunnable2 = new MyRunnable();
 Thread thread1 = new Thread(myRunnable1);
 Thread thread2 = new Thread(myRunnable2);
 thread1.start();
 thread2.start();
 }
}



12
package Programs;
class MyThread extends Thread {

 public MyThread(String name) {
 super(name);
 start();
 }
 public void run() {
 for (int i = 1; i <= 5; i++) {
 System.out.println(Thread.currentThread().getName() + ": " + i);

try {
 Thread.sleep(1000);
 } catch (InterruptedException e) {
 e.printStackTrace();
 }
 }
 }
}
public class Main {
 public static void main(String[] args) {

 for (int i = 1; i <= 5; i++) {
 System.out.println("Main Thread: " + i);

try {
 Thread.sleep(500); 
 } catch (InterruptedException e) {
 e.printStackTrace();
}
 }
 MyThread myThread = new MyThread("Child Thread");
 }
}