题解HJ54 | #表达式求值#

import java.util.*;
import javax.script.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scan = new  Scanner(System.in);
        String input = scan.nextLine();
        ScriptEngine scriptEngine = new ScriptEngineManager().getEngineByName("nashorn");
        System.out.println(scriptEngine.eval(input));
    }
}

没看懂 这题我抄的代码