Groovy动态创建类、方法合成、方法委托

/** * 动态生成类 */def expando = new Expando(name : 'hello',fun1:{int a,int b -> a*b})expando.height = 100expando.fun2 = {    int a,int b->        a+b}println expando.nameprintln expando.heightprintln expando.fun1(2,6)println expando.fun2(2,6)/** * 方法合成 */class MyPerson{    def methodMissing(String name, def args) {        println 'missing'        if (name.startsWith('play')){            //生成的class文件 调用方式不一样//            println metaClass            MyPerson p = this//            println p.metaClass            p.metaClass."$name" = {                println "invoke $name"            }            "$name"(args)        }        return null    }}def p = new MyPerson()p.playGame()p.playGame()/** * 方法委托 */class Work1{    def fun(){        println('work1')    }}class Work2{    def fun2(){        println('work2')    }}class WorkManager{    {        delegate(Work1,Work2)    }    def delegate(Class... classes){        def objects = classes.collect{it.newInstance()}        WorkManager workManager = this        workManager.metaClass.methodMissing = {            String name,def args->                def object = objects.find{it.respondsTo(name,args)}                if(object){                    //动态注入方法                    workManager.metaClass."$name" = {                        object.invokeMethod(name,args)                    }                    invokeMethod(name,args)                }        }    }}def wm = new WorkManager()wm.fun()wm.fun2()//第二种方法 groovy自带的注解class WorkManager1{    @Delegate    Work1 work1 = new Work1()    @Delegate    Work2 work2 = new Work2()}new WorkManager1().fun()new WorkManager1().fun2()