[移动开发]Groovy(三)

Groovy(三)基础

闭包

Groovy闭包很像Java中的匿名内部类

匿名内部内

闭包的使用方式

简单的定义

在Groovy中这种简单的匿名代码块就叫闭包

def closure = {println "hi"}
//调用方式
closure()
closure.call()

作为参数进行传递

def closure = {println("hi01")}
def fun_closure(closure){
    closure();
}
//1
fun_closure(closure);
//2
fun_closure({println("hi02")})
//3
fun_closure(){println("hi03")}

注意:当是构造器接收闭包作为参数时

闭包会与匿名内部类冲突

new class_closure({println("hi04")})

像闭包传递参数

默认一个参数时

def closure = {println("hi0$it")}
def fun_closure(closure){
    closure("1");
}
fun_closure(closure);

多个参数时

def closure1 = { i1,i2->println("hi$i1$i2")}
def fun_closure1(closure){
    closure("1","2");
}
fun_closure1(closure1);