[英]How to share arguments ( pass & return in both direction) between closure and method like shown below groovy code?
Groovy code: how to pass and return arguments or values Groovy代码:如何传递和返回参数或值
def method (int a, Closure c) {
Query q = new Query()
c.delegate = q
c()
//label 1: pass a to label 2 and get str from there
}
class Query
{
void key (String str) {
//label 2: return str and get a to method label 1.
}
}
method(5) {
key "got"
}
How to get access on both labels in above shown groovy code. 如何在上面显示的常规代码中访问两个标签。
I don't know how to use some keys like .call()
return
inside this closure. 我不知道如何在此闭包内使用某些键,例如.call()
return
。
Update 1: 更新1:
def method (int a, Closure c) {
Query q = new Query()
c.delegate = q
c.call(a)
def str = q.str
println str
}
class Query
{
def str
def a
void key (String str) {
this.str = str
this.a=a
println a
}
}
method(5) {
key "got"
}
Actual Output: 实际输出:
null
got
Expected Output: 预期产量:
5
got
How to solve this ? 如何解决呢?
How about something like 怎么样
def method (int a, Closure c) {
Query q = new Query()
q.a = a
c.delegate = q
c.call()
def str = q.str
println str
}
class Query
{
def str
def a
void key (String str) {
this.str = str
println a
}
}
method(5) {
key "got"
}
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