欢迎使用JAVA小白计算器

import java.util.Scanner;

public class Demo03 {
public int jia(int a, int b) {
int sum = a + b;
return sum;
}
public int cheng(int a,int b) {
int ce = a * b;
return ce;
}
public int jian(int a, int b) {
int ji = a - b;
return ji;
}
public int chu(int a, int b) {
int ch = a / b;
return ch;
}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);
while (true) {
System.out.println("请输入第一个数：");
int a = sc.nextInt();
System.out.println("请输入第二个数");
int b = sc.nextInt();

System.out.println("请选择要进行的运算:");
String PI = sc.next();
Demo03 c = new Demo03();
int e;

switch (PI) {
case "+":

e = c.jia(a, b);
System.out.println("结果是：" + e);
break;

case "-":

e = c.jian(a, b);
System.out.println("结果是：" + e);
break;

case "*":

e = c.cheng(a, b);
System.out.println("结果是：" + e);
break;

case "/":

e = c.cheng(a, b);
System.out.println("结果是：" + e);
break;

default:
System.out.println("不符合规范");
}
System.out.println("是否继续进行计算？t/exit");
String cs = sc.next();
if (cs.equals("exit")) {
System.out.println("感谢你的使用");
break;
}
}
}

}