자바 쓰레드 2개를 이용한 1~100 총합 구하기

package su1;

class B extends Thread{

int sum=0;

int a,b;

B(int start , int end){

a=start;

b=end;

}

public void run(){

for(int i=a; i<=b; i++){

sum+=i;

}

}

}

class A{

public static void main(String[] args) {

B b1 = new B(1,50);

B b2 = new B(51,100);

b1.start();

b2.start();

try{

b1.join();

b2.join();

}

catch(Exception e){}

System.out.println(b1.sum+"//"+b2.sum);

System.out.println(b1.sum + b2.sum);

}

}