Groovy学习笔记-使用多赋值

Posted 2020-09-30

1.方法返回多个结果：返回数组，将多个变量逗号隔开，放在左侧圆括号中

def splitName (fullName) { 
    fullName.split(‘ ‘)
}

def (firstName, lastName) = splitName(‘Tom Smith‘)

println "$lastName, $firstName"

/* output
 Smith Tom
*/

2.交换变量：将欲交换的变量放在左侧圆括号内，右侧中括号相反顺序放置

def name1 = ‘aaa‘
def name2 = ‘bbb‘

(name1, name2) = [name2, name1]

println "$name1, name2"

/*output
bbb, name2
*/

3.使用多赋值：如果有多余的变量，则会设置变量为null

def (String cat, String mouse) = [‘Tom‘, ‘Jerry‘, ‘Spike‘]

println "$cat, $mouse"

def (first, second, third) = [‘Tom‘, ‘Jerry‘]

println "$first, $second, $third"

/*output
Tom, Jerry
Tom, Jerry, null
*/