java中用eval

package com.xuz.csdn.june16;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;


public class ScriptEngineTest {

    public static void main(String[] args) {
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine se = sem.getEngineByName("js");
        try {
            System.out.println(se.eval("1+2*(3+4)").toString());
        } catch (ScriptException e) {
            e.printStackTrace();
        }
    }

}