package scc;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Counter {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  ScriptEngineManager manager = new ScriptEngineManager();
  ScriptEngine SE = manager.getEngineByName("js");
  String Numbers = new String("1+2/5");
  try {
   String ans = SE.eval(Numbers).toString();
   System.out.println(ans);
  }
  catch (ScriptException e) {
   e.printStackTrace();
  }
 }
}

ScriptEngineManger sem = new ScriptEngineManger();
/*script引擎管理*/
ScriptEngine se= sem.getEngineByName("JavaScript");
/*script引擎*/
JTextField tf = new JTextField(10);
try
    {
 System.out.println (se.eval ("2+2"));
 /* 执行一段script 打印结果*/
 tf.setText(se.eval(tf.getText()).tostring);
 //将运算结果显示到文本框,类似计时器效果
}
catch (ScriptException e)
    {
 System.out.println ("算术式出错！");
}