24.Collection
发表日期:2022-08-05 16:35:35 | 来源: | | 浏览(622) 分类:JAVA基础
ListDemo
import java.util.ArrayList; import java.util.Collection; import java.util.List; public class ListDemo { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Collection<String> collection = new ArrayList<String>(); collection.add("eniac"); collection.add("bast man!"); List<String> list = new ArrayList<String>(); list.add("hello"); list.add("world"); list.add(1,"-"); list.addAll(0,collection); System.out.println(list);//[eniac, bast man!, hello, -, world] list.remove(3); System.out.println(list);//[eniac, bast man!, hello, world] for (int i = 0; i < list.size(); i++) { System.out.print(list.get(i)); } System.out.println(); System.out.println(list.toArray());//[Ljava.lang.Object;@c17164 System.out.println(list.toArray(new String[]{}));//[Ljava.lang.String;@de6ced } }
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