== > 这个>是起什么作用的
three=one+tuo;
System.out.println("three=one+two ==>"+three);
three +=one;
System.out.println("three +=one ==>"+three);
three -=one;
System.out.println("three -=one ==>"+three);
three *=one;
System.out.println("three *=one ==>"+three);
three /=one;
System.out.println("three /=one ==>"+three);
three %=three;
System.out.println("three %=three ==>"+three);