import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class SampleClass extends Thread{

private int sum1 = 0;

private int sum2 = 0;

Runnable runner1 = new Runnable(){

public void run() {

// TODO Auto-generated method stub

for(int i = 0; i<5; i++){

System.out.println(Thread.currentThread().getName() + " iteration no. " + i);

}

}

};

Runnable runner2 = new Runnable(){

public void run() {

// TODO Auto-generated method stub

for(int i = 0; i<5; i++){

System.out.println(Thread.currentThread().getName() + " iteration no. " + i);

}

}

};

public void executeRunnables(){

ExecutorService executor = Executors.newFixedThreadPool(2);

executor.submit(runner1);

executor.submit(runner2);

executor.shutdown();

}

public void executeThreads(){

System.out.println(Thread.currentThread().getName());

for(int i=0; i<10; i++){

new Thread("" + i){

public void run(){

System.out.println("Thread: " + getName() + " running");

}

}.start();

}

}

public void joinThreads(){

final int[] arr = {1,2,3,4,5,6};

Thread t1 = new Thread("first half"){

public void run(){

System.out.println("Thread " + Thread.currentThread().getName() + " started.");

int temp = 0;

for(int i = 0; i<=arr.length/2; i++){

temp += arr[i];

}

sum1 = temp;

}

};

Thread t2 = new Thread("second half"){

public void run(){

System.out.println("Thread " + Thread.currentThread().getName() + " started.");

int temp = 0;

for(int i = arr.length/2 + 1; i<arr.length; i++){

temp += arr[i];

}

sum2 = temp;

}

};

Thread t3 = new Thread("addition"){

public void run(){

System.out.println("Thread " + Thread.currentThread().getName() + " started.");

System.out.println("sum: " + (sum1 + sum2));

}

};

t1.start();

t2.start();

//makes sure that t3 will be executed AFTER t1 and t2 finished.

try{

t1.join();

t2.join();

} catch(InterruptedException e){

e.printStackTrace();

}

t3.start();

}

}