package com.my.shiyan9_2;
public class Text {
public static void main(String[] args) {
// TODO 自动生成的方法存根
UseCompute u1 = new UseCompute();
Compute com = new add();
u1.useCom(com, 5, 6);
u1.useCom(new sub(), 5, 6);
u1.useCom(new mul(), 5, 6);
u1.useCom(new div(), 5, 6);
u1.useCom(new div(), 9, 3);
}
}
interface Compute{
public int computer(int n,int m);
}
//加法
class add implements Compute{
@Override
public int computer(int n,int m) {
System.out.print("加法:\n n+m = ");
// TODO 自动生成的方法存根
return n+m;
}
}
//减法
class sub implements Compute{
@Override
public int computer(int n, int m) {
System.out.print("减法:\n n-m = ");
return n-m;
}
}
//乘法
class mul implements Compute{
@Override
public int computer(int n, int m) {
System.out.print("乘法:\n n×m = ");
return n*m;
}
}
//除法
class div implements Compute{
@Override
public int computer(int n, int m) {
if(m!=0) {
System.out.print("除法:\n n÷m = ");
return n/m;
}else {
System.out.print("分母不能为零！");
return 0 ;
}
}
}
class UseCompute{
public void useCom(Compute com, int one, int two) {
System.out.println(com.computer(one, two));
}
}
为什么输出时当除法if判断分母为零时“ System.out.print("分母不能为零！");”这个语句不输出，其次就是为什么已经判断分母为零了这句“ System.out.print("除法:\n n÷m = ");”还会输出？求大神赐教。
