1 class a {
2 def v1 = "v1 in a"
3 static def v2 = "v2 in a"
4 def v4 = "v4 in a"
5 def v5 = "v5 in a"
6 def va = "va in a"
7 def b() {
8 def v1 = "v1 in a.b()"
9 def v2 = "v2 in a.b()"
10 def v4 = "v4 in a.b()"
11 def g = {
12 def v0 = "v0 in closure g"
13 def h = {
14 //function b里面已经定义v4 = "v4 in a.b()"所以下面这行
15 //报错:The current scope already contains a variable of the name v4
16 //def v4 = "v4 in closure h"
17 }
18 }
19 def c = {
20 //下面的这行代码报错:The current scope already contains a variable of the name v1
21 //def v1 = "v1 in closure c"
22 println v1
23 println owner
24 println this
25 //下面这行定义v5变量正常,输出的结果也是:v5 in closure c
26 def v5 = "v5 in closure c"
27 println v5//v4
28 println va
29 }
30 println "***" + c.toString() + "***"
31 c()
32
33 return "b func"
34 }
35
36 def d = {
37 println v1;
38 println v2;
39 println v4;
40 def v5 = "v5 in closure d"
41 println v5
42 }
43
44 def e = {
45 def v1 = "v1 in closure e"
46 def f = {
47 //下面这行代码报错:The current scope already contains a variable of the name v1
48 //def v1 = "v1 in closure f"
49 println v1
50
51 //下面这行就没错,因为闭包e的v2是在后面定义的
52 def v2 = "v2 in closure f"
53
54 //下面这行报错,v3在f里面不可见
55 //println v3
56
57 def vf = "vf in closure f"
58 }
59 f()
60 def v2 = "v2 in closure e"
61 def v3 = "v3 in closure e"
62
63 //在闭包e里面vf不可见
64 //println vf
65 }
66 }
67 def test(x) {
68 println "func test start --- x:" + x
69 def v1 = 1000
70 def v2 = 2000
71 def v3 = 3000
72
73 x()
74 println "func test--- end:"
75 }
76 test(new a().d)
77 println "--------------"
78 //println new a().v4
79 println new a().b()
80 new a().e()
81
82
83 /*
84 通过上面的测试代码可以看出:
85 1.在闭包a里面定义的闭包b,那么b中定义的变量不能和和闭包a里面定义的变量名字相同.
86 2.在函数a里面定义的闭包b,那么b中定义的变量不能和和函数a里面定义的变量名字相同.
87 3.由此也可以推导出:在函数a里面定义闭包b,在闭包b里面定义闭包c,那么c中定义
88 的变量也不能和函数a中定义的变量名字相同,对于任意多层闭包嵌套也是如此
89 在闭包里面的符号查找方面:
90 首先在闭包里面查找,如果闭包里面没有定义,则有两种情况(假设delegate策略是Closure.OWNER_FIRST,其它策略是一样的):
91 1.如果这个闭包的外层是函数,则现在函数里面查找,如果函数里面也没有定义,则进入delegate策略即在owner里面查找,
92 如果owner里面没有,则在delegate里面查找,ruguo delegate里面没有就报错
93 2.如果这个闭包没外层不是函数,则直接进入delegate策略即在owner里面查找,如果owner里面没有,则在delegate里面查找
94 如果delegate里面没有就报错.
95
96 */
