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();        }    }}