利用联合编译混合使用 Groovy 和 Java

//AGroovyClass.groovy
class AGroovyClass {
    def useClosure(closure) {
        println "Calling closure"
        closure()
    }

    def passToClosure(int value, closure) {
        println "Simply passing $value to the given closure"
        closure(value)
    }
} 

//UseAGroovyClass.java
public class UseAGroovyClass {
    public static void main(String[] args) {
        AGroovyClass instance = new AGroovyClass();
        Object result = instance.useClosure(new Object() {
            public String call() {
                return "You called from Groovy!";
            }
        });

        System.out.println("Received: " + result);
    }
}

#编译运行
groovyc -j UseAGroovyClass.java AGroovyClass.groovy
java -classpath $GROOVY_HOME/embeddable/groovy-all-2.4.5.jar:. UseAGroovyClass