列表List
列表
常用方法：
//List定义
def list=new ArrayList()//这是java的定义方式，这里也可以用
def list2=[1,2,3,4,5]
println list2.class //有没有像数组，输出：java.util.ArrayList
def list3=[1,2,3,4,5] as int[]
println list3.class //输出：[I 说明这个是数组
int[] array=[1,2,3,4,5]//数组
//添加元素
list2.add(6)
list2.leftShift(7)//相当于add
println list2+8 //相当于add 输出：[1, 2, 3, 4, 5, 6, 7, 8] 但是会产生一个新列表，原列表不变
println list2.toListString()// 输出：[1, 2, 3, 4, 5, 6, 7]
//删除元素
list2.remove(1) //可以传角标也可以传对象
list2.remove((Object)4)//输出：[1, 3, 5, 6, 7]
println list2
list2.removeAt(2)
println list2 //输出：[1, 3, 6, 7]
list2.removeElement(3)
println list2 //输出：[1, 6, 7]
list2.removeAll {
it%2==0
}
println list2 //输出：[1, 7]
def list5=[1,2,3,4,5]
println list5-[2,4] //输出：[1, 3, 5]
println list5.toListString()
//排序
def sortList=[6,-1,3,5,2,-9]
//可以像java一样定义一个比较器
Comparator comparator={a,b->
a==b?0:(Math.abs(a)>Math.abs(b)?1:-1)
}
sortList.sort(comparator)
//同上
//Collections.sort(sortList,comparator)
println sortList
sortList.sort {a,b->
a==b?0:(Math.abs(a)>Math.abs(b)?1:-1)
}
def sortStringList=['abc','z','hello','groovy','java']
sortStringList.sort{
it.size()
}
println sortStringList//输出：[z, abc, java, hello, groovy]
//查找
def findList = [-3, 9, 6, 2, -7, 1, 5]
int result = findList.find { return it % 2 == 0 }
//def result = findList.findAll { return it % 2 != 0 }
//def result = findList.any { return it % 2 != 0 }
//def result = findList.every { return it % 2 == 0 }
println result
println findList.min { return Math.abs(it) }
println findList.max { return Math.abs(it) }
//统计个数
def num = findList.count { return it % 2 == 0 }
println num
映射Map
//java中的定义方式
//def map = new HashMap()
def colors = [red : 'ff0000',
green: '00ff00',
blue : '0000ff']
//索引方式
//println colors['red']
println colors.red
colors.blue
//添加元素
//colors.yellow = 'ffff00'
colors.complex = [a: 1, b: 2]
//获取colors的类型，注意不能用colors.class来获取，colors.class相当于是从colors中查找key为class的value了
//println colors.getClass()
/**
* Map操作详解
*/
def students = [
1: [number: '0001', name: 'Bob',
score : 55, sex: 'male'],
2: [number: '0002', name: 'Johnny',
score : 62, sex: 'female'],
3: [number: '0003', name: 'Claire',
score : 73, sex: 'female'],
4: [number: '0004', name: 'Amy',
score : 66, sex: 'male']
]
//遍历Entry
students.each { def student ->
println "the key is ${student.key}, " +
" the value is ${student.value}"
}
//带索引的遍历
students.eachWithIndex { def student, int index ->
println "index is ${index},the key is ${student.key}, " +
" the value is ${student.value}"
}
//直接遍历key-value
students.eachWithIndex { key, value, index ->
println "the index is ${index},the key is ${key}, " +
" the value is ${value}"
}
//Map的查找
def entry = students.find { student ->
return student.value.score >= 60
}
//println entry
def entrys = students.findAll { student ->
return student.value.score >= 60
}
//println entrys
def count = students.count { student ->
return student.value.score >= 60 &&
student.value.sex == 'male'
}
//println count
def names = students.findAll { student ->
return student.value.score >= 60
}.collect {
return it.value.name
}
//println names.toListString()
def group = students.groupBy { student ->
return student.value.score >= 60 ? '及格' : '不及格'
}
//println group.toMapString()
/**
* 排序,这个会生成一个新map，原map是不变的
*/
def sort = students.sort { student1, student2 ->
Number score1 = student1.value.score
Number score2 = student2.value.score
return score1 == score2 ? 0 : score1 < score2 ? -1 : 1
}
println sort.toMapString()
println students.toMapString()
输出结果
Range
image.png
//范围Range是继承自List的，所以前面讲解到的List中的方法在Range中都可以使用
def range=1..10
//输出
println range[0] //1
println range.contains(10) //true
println range.from //1
println range.to //10
//遍历
range.each {
println it
}
for(i in range)
{
println i
}
//Range的典型使用
def result=getGrade(70)
println result
def getGrade(def score)
{
def result;
switch (score)
{
case 0..<60://从0到60，但是小于60，也就是说不包括60
result="不及格"
break
case 60..<70:
result='及格'
break
case 70..<80:
result='良好'
break
case 80..100:
result='优秀'
break
}
return result
}
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