void main(){// 定义List第一种方式List listArr = ["孙悟空","猪八戒","沙和尚","唐僧"];print(listArr[0]); // 孙悟空// 定义List第二种方式List listArr2 = new List();listArr2.add('牛魔王');print(listArr2); // ["牛魔王"]// List 常用属性List listArr3 = ["孙悟空","猪八戒","沙和尚","唐僧"];print(listArr3.length); // 4print(listArr3.isEmpty); // falseprint(listArr3.isNotEmpty); //trueprint(listArr3.reversed); // (唐僧,沙和尚,猪八戒,孙悟空)print(listArr3.reversed.toList()); // [唐僧,沙和尚,猪八戒,孙悟空]
// List 常用方法List listArr4 = ["孙悟空","猪八戒","沙和尚","唐僧"];print(listArr4.add("牛魔王")); // 增加单个print(listArr4.addAll(["白骨精","太上老君"])); // 增加多个 ["孙悟空","猪八戒","沙和尚","唐僧","白骨精","太上老君"]print(listArr4.indexOf("孙悟空")); // 0 返回索引值 查找不到返回-1 listArr4.remove("唐僧");print(listArr4); // ["孙悟空","猪八戒","沙和尚","白骨精","太上老君"]listArr4.removeAt(4); // 使用索引值删除print(listArr4); // ["孙悟空","猪八戒","沙和尚","白骨精"]List listArr5 = ["孙悟空","猪八戒","沙和尚","唐僧"];listArr5.fillRange(1,2,"太上老君"); // fillRange(开始位置, 结束位置, 修改的数据)print(listArr5); // ["孙悟空","太上老君","沙和尚","唐僧"]listArr5.insert(1,"猪八戒");print(listArr5); // insert(插入位置, 插入的数据) 单个数据listArr5.insertAll(1,["白骨精", "牛魔王"]); // 插入多个值print(listArr5); // ["孙悟空","白骨精","牛魔王","猪八戒","太上老君","沙和尚","唐僧"]List listArr6= ["孙悟空","猪八戒","沙和尚","唐僧"];String str = listArr6.join("-") // 数组分割成字符串print(str is String); // trueprint(str); // 孙悟空-猪八戒-沙和尚-唐僧String str2 = "孙悟空-猪八戒-沙和尚-唐僧"; List listArr7 = str2.split('-'); // 字符串拼接成数组print(listArr7); // ["孙悟空","猪八戒","沙和尚","唐僧"]}

void main(){var setTest = new Set();setTest.add("aaaa");setTest.add("bbbb");setTest.add("aaaa");print(setTest); // { aaa, bbb} 去除重复print(setTest.toList()); //[aaa,bbb]// 去重List listArr = ["孙悟空","猪八戒","牛魔王","猪八戒"];var setTest2 = new Set();setTest2.addAll(listArr);print(setTest2); //{孙悟空,猪八戒,牛魔王}print(setTest2.toList());// [孙悟空,猪八戒,牛魔王];
}

void main(){Map person = {"name":"孙悟空","age" : 500};// var mapTest = new Map();
// mapTest["name"] = "孙悟空";
// 常用属性print(person.keys); // (name,age)print(person.keys.toList()); // [name,age]print(person.values.toList()); // [孙悟空,500]print(person.isEmpty); // falseprint(person.isNotEmpty); // true// 常用方法person.addAll({"work":["取经","杀怪"],"height":180});print(person); // {name:孙悟空, age:500, work: [取经, 杀怪], height:180}person.remove("height");print(person); // {name:孙悟空, age:500, work: [取经, 杀怪]}person.containsValue("孙悟空"); // true
}

void main(){// ListList listArr = ["孙悟空","猪八戒","沙和尚","唐僧"];for(int i = 0; i <listArr.length; i++ ){print(listArr[i]);}for(List item in listArr){print(item);}listArr.forEach((value){print("$value");});List listArr2 = [1,2,3,4];List newList = new List();for(int i = 0; i <listArr2.length; i++ ){newList.add(listArr2[i]*2);};print(newList); //[2,4,6,8]List newList2 = listArr2.map((value){return value*2;});print(newList2);// (2,4,6,8)print(newList2.toList()); // [2,4,6,8]List listArr3 = [1,2,3,4];List newList3 = listArr3.where((value){return value > 2;});print(newList3); // [3,4]List listArr4 = [1,2,3,4];Bool boolTest = listArr4.any((value){  // 只要集合里面有满足条件返回truereturn value > 2;});print(boolTest); // trueList listArr5 = [1,2,3,4];Bool boolTest2 = listArr5.every((value){  // 只要集合里面每一个都要满足条件返回truereturn value > 2;});print(boolTest2); // false// Setvar setTest = new Set();setTest.addAll([123,345,678]);setTest.forEach((value)=> print(value));// 123 345 678Map person2 = {"name":"孙悟空","age":24};person2.forEach((key, value){ // Map 中的forEach有两个参数print("$key --- $value"); // name --- 孙悟空})
}