计算器类

package calculator;

import java.util.Scanner;

public class Calculator{

private float number1;

private float number2;

private float addresult;

private float minusresult;

private float multipleresult;

private float divideresult;

public Calculator() {

}

public Calculator(float number1,float number2) {

this.number1=number1;

this.number2=number2;

}

//加法的实现

public float add(){

System.out.println(number1+"+"+number2+"="+(number1+number2));

return addresult;

}

//减法的实现

public float minus() {

System.out.println(number1+"-"+number2+"="+(number1-number2));

return minusresult;

}

//乘法的实现

public float multiple() {

System.out.println(number1+"*"+number2+"="+(number1*number2));

return multipleresult;

}

//除法的实现

public float divide() {

if(number2==0.0f) {

System.out.println("0不能做除数");

}

else {

System.out.println(number1+"/"+number2+"="+(number1/number2));

}

return divideresult;

}

}

测试类如下

package calculator;

import java.util.Scanner;

public class Test {

public static void main(String[] args) {

// TODO Auto-generated method stub

System.out.println("***********************");

System.out.println("欢迎使用计算机系统");

System.out.println("请输入两个数字");

Scanner sc=new Scanner(System.in);

float number1=sc.nextFloat();

float number2=sc.nextFloat();

Calculator c=new Calculator(number1,number2);

System.out.println("请输入要进行的操作序号。");

System.out.println("1，两数相加。 2，两数相减。 3，两数相乘。 4，两数相除");

System.out.println("************************");

int s;

s=sc.nextInt();

switch(s){

case 1:

c.add();

break;

case 2:

c.minus();

break;

case 3:

c.multiple();

break;

case 4:

c.divide();

break;

}

sc.close();

}

}

新手学习，还请多指教。