Java接口练习
利用接口做参数,写个计算器,能完成加减乘除运算
(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来完成加减乘除运算。
代码展示:
1,定义接口:
package compute;
public interface Compute {
//定义接口
int compute(int n, int m);
}
2,加法类:
package compute;
public class Addition implements Compute{
@Override
public int compute(int n, int m) {
return n+m;
}
}
3,减法类:
package compute;
public class Subtraction implements Compute{
@Override
public int compute(int n, int m) {
return n-m;
}
}
4,乘法类:
package compute;
public class Multiplication implements Compute{
@Override
public int compute(int n, int m) {
return n*m;
}
}
5,除法类:
package compute;
public class Division implements Compute{
@Override
public int compute(int n, int m) {
return n/m;
}
}
6,UseCompute类:
package compute;
public class UseCompute {
public static void useCom(Compute com,int a,int b){
System.out.println(com.compute(a,b));
}
}
7,测试类:
package compute;
public class Test {
public static void main(String[] args) {
Compute compute = new Addition();
UseCompute.useCom(compute,20,10);
compute = new Subtraction();
UseCompute.useCom(compute,20,10);
compute = new Multiplication();
UseCompute.useCom(compute,20,10);
compute = new Division();
UseCompute.useCom(compute,20,10);
}
}
运行结果: