import com.singularsys.jep.Jep;
　　import com.singularsys.jep.JepException;
　　public class SimpleExample
　　{ public static void main(String[] args) { Jep jep = new Jep(); //一个数学表达式
　　String exp = "((a+b)*(c+b))/(c+a)/b"; //给变量赋值
　　jep.addVariable("a", 10);
　　jep.addVariable("b", 10);
　　jep.addVariable("c", 10);
　　try { //执行
　　jep.parse(exp);
　　Object result = jep.evaluate();
　　System.out.println("计算结果： " + result); }
　　catch (JepException e)
　　{
　　System.out.println("An error occured: " + e.getMessage());
　　}
　　}
　　}

 package com.eric.test;

import org.nfunk.jep.JEP;

public class SimpleExample {
	public static void main(String[] args) {
		JEP jep = new JEP(); // 一个数学表达式
		String exp = "((a+b)*(c+b))/(c+a)/b"; // 给变量赋值
		jep.addVariable("a", 10);
		jep.addVariable("b", 10);
		jep.addVariable("c", 10);
		jep.parseExpression(exp);
		Object result = jep.getValueAsObject();
		System.out.println("计算结果： " + result);
	}

}

 package com.eric.test;

import org.nfunk.jep.JEP;

public class Test {
	public static void main(String[] args) {
		JEP myPrase=new JEP();

		myPrase.parseExpression("5+1+6");

		double a=myPrase.getValue();

		System.out.println(a);
		
		myPrase.parseExpression("1000<10002&&1001>1000");
		//System.out.println((Boolean)myPrase.getValueAsObject());
		System.out.println(myPrase.getValue());
	}

}

package com.eric.test;

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

public class ScriptTest {
	private ScriptEngine se;

	public ScriptTest() {
		ScriptEngineManager sem = new ScriptEngineManager();		
		se = sem.getEngineByExtension("js");
	}

	public Object cal(String expression) {
		Object result = null;
		try {
			result = se.eval(expression);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("Error occured");
		}
		return result;
	}

	public static void main(String[] args) {
		ScriptTest app = new ScriptTest();
		String[] s = { "1+1", "(1-2)*4", "3*(2+4)/27" };
		for (int i = 0; i < s.length; i++) {
			Object r = app.cal(s[i]);
			System.out.println(s[i] + " = " + r);
		}
	}
}