利用接口做参数,写个计算器,能完成+-*/运算
(1)定义一个接口Compute含有一个方法int computer(int n,int m);
(2)设计四个类分别实现此接口,完成+-*/运算
(3)设计一个类UseCompute,含有方法:public void useCom(Compute com, int one, int two)
此方法要求能够:1.用传递过来的对象调用computer方法完成运算2.输出运算的结果
(4)设计一个测试类,调用UseCompute中的方法useCom来完成+-*/运算
1 public interface Compute {2 3 int computer(int m,int n);4 5 }
1 public class Add implements Compute {2 3 @Override4 public int computer(int m, int n) {5 6 return m+n;7 }8 9 }
1 public class Subtract implements Compute {2 3 @Override4 public int computer(int m, int n){5 6 return m-n;7 }8 9 }
1 public class Cheng implements Compute {2 3 @Override4 public int computer(int m, int n){5 6 return m*n;7 }8 9 }
1 public class Chu implements Compute {2 3 @Override4 public int computer(int m, int n) {5 6 return m/n;7 }8 9 }
1 public class UseCompute { 2 public void useCom(Compute com, int one, int two) { 3 4 com.computer(one, two); 5 System.out.println("结果=" + com.computer(one, two)); 6 7 } 8 9 public static void main(String[] args) {10 11 UseCompute jsq = new UseCompute();12 // 加13 Add a = new Add();14 jsq.useCom(a, 150, 33);15 // 减16 Subtract b = new Subtract();17 jsq.useCom(b, 150, 33);18 // 乘19 Cheng c1 = new Cheng();20 jsq.useCom(c1, 150, 33);21 // 除22 Chu c2 = new Chu();23 jsq.useCom(c2, 150, 33);24 }25 }
结果:
原标题:接口—计算器
关键词:接口