java-集合遍歷
阿新 • • 發佈:2022-04-01
import java.util.ArrayList; import java.util.Arrays; import java.util.Iterator; import java.util.Scanner; public class Javatest83 { /** * 集合-Collection(ArrayList、LinkedList等) * 練習2:提示使用者輸入整數,存放到ArrayList集合中, * 輸入0代表結束。分別使用for、foreach、iterator迴圈集合,並刪除所有是3的倍數的元素 */ public staticvoid main(String[] args) { ArrayList<Integer> list = new ArrayList<>(); System.out.println("請輸入整數,輸入0代表結束:"); Scanner sc = new Scanner(System.in); int i = sc.nextInt(); while(i != 0){ list.add(i); System.out.println("請輸入整數,輸入0代表結束:"); i= sc.nextInt(); } //for遍歷 for (int j = 0; j < list.size();) { if(list.get(j) % 3 == 0) list.remove(j); else j++; } System.out.println(Arrays.toString(list.toArray())); //foreach遍歷 for (Integer m:list) { System.out.println(m); }//Iterator遍歷 Iterator it = list.iterator(); while (it.hasNext()){ int tep = (int)it.next(); if(tep % 3 == 0){ it.remove(); } else System.out.println(tep); } } }