/**
* 动态生成类
*/
def expando =
new Expando(
name :
'hello',
fun1:{
int a,
int b -> a*b})
expando.
height =
100
expando.
fun2 = {
int a,
int b->
a+b
}
println expando.
name
println expando.
height
println 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()
