java写计算器思路（JAVA学到方法写了一个四则运算计算器，请教一下有什么需要改进的）
导读：package method; /* * 四则运算计算器 * */ import java.util.Scanner; public...
package method;
/*
* 四则运算计算器
* */
import java.util.Scanner;
public class Demo07
{
public static void main(String[] args)
{
Scanner scanner = new Scanner(System.in);
int a = 0;
int num1 = 0, num2 = 0;
System.out.println("请选择运行方法");
System.out.println("1.加法\t2.减法\t3.乘法\t4.除法");
if (scanner.hasNextInt())
{
a = scanner.nextInt();
}
switch (a)
{
case 1 ->
{
System.out.println("请输入两个操作数");
if (scanner.hasNextInt())
{
num1 = scanner.nextInt();
num2 = scanner.nextInt();
}
System.out.println(add(num1, num2));
}
case 2 ->
{
System.out.println("请输入两个操作数");
if (scanner.hasNextInt())
{
num1 = scanner.nextInt();
num2 = scanner.nextInt();
}
System.out.println(sub(num1, num2));
}
case 3 ->
{
System.out.println("请输入两个操作数");
if (scanner.hasNextInt())
{
num1 = scanner.nextInt();
num2 = scanner.nextInt();
}
System.out.println(mpc(num1, num2));
}
case 4 ->
{
System.out.println("请输入两个操作数");
if (scanner.hasNextInt())
{
num1 = scanner.nextInt();
num2 = scanner.nextInt();
}
System.out.println(div(num1, num2));
}
default -> System.out.println("输入非法");
}
scanner.close();
}
//加法运算
public static int add(int num1, int num2)
{
return num1 + num2;
}
//减法运算
public static int sub(int num1, int num2)
{
return num1 - num2;
}
//乘法运算
public static int mpc(int num1, int num2)
{
return num1 * num2;
}
//除法运算
public static int div(int num1, int num2)
{
return num1 / num2;
}
}
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