public class HelloWorld{

    public static void main(String[] args) {

    int one = 10 ;

        int two = 20 ;

        int three=0;

        three =one+two;

        System.out.println("three=one+two==>"+three+"\t");

        System.out.println("three+=one==>"+(three+=one)+"\t");

        System.out.println("three-=one==>"+(three-=one)+"\t");

        System.out.println("three*=one==>"+(three*=one)+"\t");

        System.out.println("three/=one==>"+(three/=one)+"\t");

        System.out.println("three%=one==>"+(three%=one)+"\t");

}

}

  为什么每条都要加呢？  直接输出代码不是会少点，速度会快点