Java调用JavaScript实现字符串计算器代码示例

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！");
}