hw10_19.java

来自「Java程序设计实例」· Java 代码 · 共 51 行

//10-19
interface Show_ans
{
   void show();
}
interface Math extends Show_ans
{
   int add(int a,int b); //计算a+b
   int sub(int a,int b); //计算a-b
   int mul(int a,int b); //计算a*b
   int div(int a,int b); //计算a/b
}

class Compute implements Math
{
   int ans;
   public int add(int a,int b) //计算a+b
   {
      ans=a+b;
      return 0;
   }
   public int sub(int a,int b) //计算a-b
   {
      ans=a-b;
      return 0;
   }
   public int mul(int a,int b) //计算a*b
   {
      ans=a*b;
      return 0;
   }
   public int div(int a,int b) //计算a/b
   {
      ans=a/b;
      return 0;
   }
   public void show()
   {
      System.out.println("ans="+ans);
   }
}

public class hw10_19
{
   public static void main(String args[])
   {
      Compute cmp=new Compute();
      cmp.mul(3,5);
      cmp.show();
   }
}