pom文件引入groovy包

<dependency>
      <groupId>org.codehaus.groovy</groupId>
      <artifactId>groovy-all</artifactId>
      <version>2.5.5</version>
    </dependency>

java接口

package com.yydone.test;

interface IFoo {
    Object add(Object x, Object y);
}

groovy实现类，实现IFoo接口

package com.yydone.test

class Foo implements IFoo {
    Object add(Object x, Object y) {
        return x + y
    }
}

java测试类

package com.yydone.test;

import groovy.lang.GroovyClassLoader;

public class GroovyClassLoaderExample {

    public static void main(String[] args) {
        try {
            Class clazz;
            try (GroovyClassLoader loader = new GroovyClassLoader()) {
                clazz = loader.loadClass("com.yydone.test.Foo");
            }
            IFoo foo = (IFoo) clazz.newInstance();
            System.out.println( foo.add(new Integer(2), new Integer(3)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

运行结果

5

成功调用groovy实现