Groovy学习笔记(一)基本语法

1.变量的定义和赋值

 def param
 type param
 (param1,param2,param3) = [1,2,3]   

 //注: 句尾分号可有可无

2.包的导入

  import com.a.b
   //解决命名冲突使用as关键字
   import com.a.b.C as AC
   import com.b.b.C as BC
   AC ac
   BC bc

3.数组及循环定义

a.顺序数组: 1..3 ,1..<5  type IntRange
b.离散数组:[1,2,4,6] as int[]
c. for (i in 1..3) {} ,for (i = 0; i < 10; i++)
d.3.times {}
e. 3.upto(5) {}

4.空指针及异常判断

a.Object?.exec()
b.try { //TODO }catch(ex) {//TODO}

5.用接口封装闭包(单方法接口)

interface Listener {
     void perform()
}
def function(Listener listener) {
listener.perform()
}
function ({//TODO} as Listener)
//闭包对象将被封装到Listener的perform方法中

对于多方法接口的闭包传递方法(MAP类):

handle = [perform1 : {//TODO},perform2:{//TODO}]
function (handle as Listener) 

动态调用动态类型

def types = ['ActionListener1','ActionListener2']
def handle = {println it}
for (i in types) {
     handleImpl = handle.asType("com.test.$i")
     obj."add$i"(handleImpl)
}

6.运算符重载

<<: leftShift(other)
+: plus(other)

7.switch语句:

 switch (state) {
case [state1,state2]:
break;
case state3:
break;
}

8.动态类型调用

class Man {
def sayHello() {//TODO}
}
class Woman {
def sayHello() {//TODO}
}
function (person) {
person.sayHello()
}