话不多说，代码献上：
package demopo1; import java.util.Scanner; public class javatest { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("请输入第一个数字："); int firstNum = in.nextInt(); System.out.println("请输入算数运算符号："); String s = in.next(); System.out.println("请输入第二个数字："); int secondNum = in.nextInt(); switch(s){ case "+": System.out.println(firstNum + "+" +secondNum+"="+(firstNum+secondNum)); break; case "-": System.out.println(firstNum+"-"+secondNum+"="+(firstNum-secondNum)); break; case "*": System.out.println(firstNum+"*"+secondNum+"="+(firstNum*secondNum)); break; case "/": System.out.println(firstNum+"/"+secondNum+"="+(firstNum/secondNum)); break; default: System.out.println("输入有误...."); } } }
运行结果：
请输入第一个数字： 22 请输入算数运算符号： * 请输入第二个数字： 6 22*6=132
