Groovy 默认为您执行此操作(映射构造函数)。您不需要工厂方法。这是一个例子
import groovy.transform.ToString
@ToString(includeFields = true, includeNames = true)
class Foo{
String name = "Default Name"
int age = 25
String address = "Default Address"
}
println new Foo()
println new Foo(name: "John Doe")
println new Foo(name: "Max Payne", age: 30)
println new Foo(name: "John Miller", age: 40, address: "Omaha Beach")
//Prints
Foo(name:Default Name, age:25, address:Default Address)
Foo(name:John Doe, age:25, address:Default Address)
Foo(name:Max Payne, age:30, address:Default Address)
Foo(name:John Miller, age:40, address:Omaha Beach)
UPDATE
@codelark 的占星术:)。如果该类无法设置默认值,您可以这样做
@ToString(includeFields = true, includeNames = true)
class Bar{
String name
int age
String address
}
def createBar(Map map = [:]){
def defaultMap = [name:'John Doe',age:51,address:'High Street 11']
new Bar(defaultMap << map)
}
println createBar()
println createBar(name: "Ethan Hunt")
println createBar(name: "Max Payne", age: 30)
println createBar(name: "John Miller", age: 40, address: "Omaha Beach")
//Prints
Bar(name:John Doe, age:51, address:High Street 11)
Bar(name:Ethan Hunt, age:51, address:High Street 11)
Bar(name:Max Payne, age:30, address:High Street 11)
Bar(name:John Miller, age:40, address:Omaha Beach)