java中如何将字符串转化为字符_如何在Java中将字符串转换为运算符？

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Is it possible to pass arithmetic operators to a method in java?8个

我试图在java中创建一个简单的基于文本的计算器,我的第一个程序,EVER,我无法弄清楚如何将输入字符串转换为变量opOne.然后,我将尝试使用opOne作为运算符对numTwo运行numOne.

代码如下：

import java.io.*;

import java.math.*;

public class ReadString {

public static void main (String[] args) {

System.out.print("Enter the first number: ");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

int numOne = 0 ;

int numTwo = 0 ;

String opOne = null;

while(true){

try {

numOne = Integer.valueOf(br.readLine());

break;

} catch (IOException error) {

System.out.println("error; try again.");

System.exit(1);

}

catch (NumberFormatException nfe) {<