Example of thread join

এই উদাহরণে, join এর মাধ্যমে  আমরা দুইটা থ্রেডের রেজাল্টকে এক করে দেখবো 

public class ComplexCalculation {
    public BigInteger calculateResult(BigInteger base1, 
                                      BigInteger power1, 
                                      BigInteger base2, 
                                      BigInteger power2) {
        BigInteger result;
        PowerCalculatingThread thread1 = new PowerCalculatingThread(base1, power1);
        PowerCalculatingThread thread2 = new PowerCalculatingThread(base2, power2);
 
        thread1.start();
        thread2.start();
 
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
 
        result = thread1.getResult().add(thread2.getResult());
        return result;
    }
 
    private static class PowerCalculatingThread extends Thread {
        private BigInteger result = BigInteger.ONE;
        private BigInteger base;
        private BigInteger power;
 
        public PowerCalculatingThread(BigInteger base, BigInteger power) {
            this.base = base;
            this.power = power;
        }
 
        @Override
        public void run() {
            for(BigInteger i = BigInteger.ZERO;
                i.compareTo(power) !=0;
                i = i.add(BigInteger.ONE)) {
                result = result.multiply(base);
            }
        }
 
        public BigInteger getResult() {
            return result;
        }
    }
}