1 package com.Lucky; 2 3 import java.util.ArrayList; 4 import java.util.Iterator; 5 6 /** 7 * 集合: Collection[接口] 与 Map[接口] 8 * 9 * Collection: List 与 Set 与 Queue 10 * 11 * List: ArrayList LinkedList 12 * Set: HashSet LinkedHashSet 13 * Queue: LinkedList 14 * 15 * 16 * 17 * Map: HashMap 与 TreeMap 18 * 19 * 20 */ 21 public class ListRemark { 22 23 public static void main(String[] args) { 24 ArrayList arrayList=new ArrayList(); 25 arrayList.add(10); 26 arrayList.add(20); 27 arrayList.add(5); 28 arrayList.add(50); 29 30 31 //获取集合里面的数据 32 System.out.println("--------1.for循环遍历----------------"); 33 System.out.print("["); 34 for (int i = 0; i < arrayList.size(); i++) { 35 if(i==arrayList.size()-1){ 36 System.out.print(arrayList.get(i)); 37 }else { 38 System.out.print(arrayList.get(i)+","); 39 } 40 } 41 System.out.println("]"); 42 43 44 45 46 47 48 System.out.println("--------2.高级for遍历----------------"); 49 System.out.print("["); 50 for (Object obj:arrayList) { 51 System.out.print(obj+","); 52 } 53 System.out.println("]"); 54 55 56 System.out.println("--------3.迭代器遍历----------------"); 57 Iterator iterator= arrayList.iterator(); 58 System.out.print("["); 59 while (iterator.hasNext()){ 60 System.out.print((int)iterator.next()+","); 61 } 62 System.out.println("]"); 63 64 65 System.out.println("--------4.lambda遍历----------------"); 66 System.out.print("["); 67 arrayList.forEach((elem)->System.out.print(elem+" ")); 68 System.out.println("]"); 69 70 } 71 72 73 }
标签:--------,arrayList,System,print,集合,println,out From: https://www.cnblogs.com/Lucky-only/p/16975153.html