个回答

• 慕尼黑9030500

  2019-09-04 22:16:53

  已采纳

  public class HelloWorld{

      public static void main(String[] args) {

      int one = 10 ;

          int two = 20 ;

          int three = 0 ;这个地方已经有定义了three变量

          three=one+two;所以在这里加int会出现报错

  //

  error: variable three is already defined in method main(String[])
          int three=one+two;

  //

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

          three=three+one;

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

          three=three-one;

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

          three=three*one;

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

          three=three/one;

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

          three=three%one;

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

  }

  }

  
  

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