字符串字面值
def age=25
log.info 'My age is ${age}'
log.info "my age is ${age}"
log.info "My age is ${age}"
log.info """My age is ${age} """
字符串索引
def greeting='hello world'
greeting [1] 输入结果：e
greeting[-1] d
greeting[1..4] ello
greeting[1..<5] ello
greeting[4..2] oll
greeting[4,3,7] olr
def hah='Hello world'
'hello'+'world' //把两个字符串连接起来 helloworld
'hello'*3 //hellohellohello
'hello'+3 //hello3
hah -'o world' //Hell hah
hah.length() //11
hah.size() //11
hah.count('l') //3 hah中l出现的次数
hah.contains('ell') //true hah中是否存在ell
String方法：
String te='ha'
def hah='Hello world'
def ha='what is hah
def to=te.center(10,'l') // te字符串长度为10，左右均使用l填充
te.center(10) // te字符串长度为10，左右均使用空格填充
log.info to
te.concat('test') //te后面加上字符串test
'test'.compareToIgnoreCase('hah') //按字典顺序比较两个字符串，忽略大小写，返回int值
ha.equalsIgnoreCase(ha) //比较恋歌字符串，忽略大小写，返回Boolean
hah.getAt(0) // hah此字符串第0个字符
hah.indexOf('d') //hah此字符串d的索引值
hah.leftShift(12334) //Hello world12334
ha.minus('is') //删除字符串中的is
ha.next() //
log.info ha.padLeft(30) //在字符串左侧使用空格填充字符。需共30个字符
log.info ha.padLeft(30,'@')
log.info ha.padRight(30) //在字符串右侧使用空格填充字符。需共30个字符
log.info ha.padRight(30,'@')
5.plus(5) //5+5
hah.previous() //删除hah最后一个字符
hah.reverse() //创建当前字符的逆序字符串
hah <=>ha //比较字符串
hah.compareTo(ha) //比较字符串