public class TestDemo {
public static void main(String[] args) {
// set 转list
List list = new ArrayList(new HashSet());
// list 转set
Set set = new HashSet(new ArrayList());
// 数组转list
List stooges = Arrays.asList("Larry", "Moe", "Curly");
// 数组转set
int[] a = { 1, 2, 3 };
Set sets = new HashSet(Arrays.asList(a));
// map的操作
Map map = new HashMap();
map.put("1", "a");
map.put(‘2‘, ‘b‘);
map.put(‘3‘, ‘c‘);
for(Object ma : map.keySet()){
System.out.printf("ma:"+ma);
}
System.out.println(map);
System.out.println(map.keySet());
System.out.println(map.values());
// 将map转为list
List mapList = new ArrayList(map.values());
System.out.println(mapList);
// 将map的值转化为Set
Set mapSet = new HashSet(map.values());
System.out.println(mapSet);
// list转数组
List listCon = Arrays.asList("a", "b");
System.out.println(listCon);
String[] arr = (String[]) list.toArray(new String[list.size()]);
System.out.println(Arrays.toString(arr));
}
}
Map,list,set,集合转化,布布扣,bubuko.com
原文地址:http://www.cnblogs.com/love-you-girl/p/3811619.html