Java,使用Iterator搜索ArrayList并删除匹配的对象 [英] Java, Using Iterator to search an ArrayList and delete matching objects
本文介绍了Java,使用Iterator搜索ArrayList并删除匹配的对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
基本上,用户提交一个字符串,Iterator在其中搜索ArrayList。找到时Iterator将删除包含String的对象。
Basically, the user submits a String which the Iterator searches an ArrayList for. When found the Iterator will delete the object containing the String.
因为这些对象中的每一个都包含两个字符串,所以我发现将这些行写成一个就很麻烦。
Because each of these objects contain two Strings, I am finding trouble writing these lines as one.
Friend current = it.next();
String currently = current.getFriendCaption();
感谢您的帮助!
推荐答案
您不需要在一行上使用它们,只需使用删除
即可在匹配时删除项目:
You don't need them on one line, just use remove
to remove an item when it matches:
Iterator<Friend> it = list.iterator();
while (it.hasNext()) {
if (it.next().getFriendCaption().equals(targetCaption)) {
it.remove();
// If you know it's unique, you could `break;` here
}
}
完整演示:
import java.util.*;
public class ListExample {
public static final void main(String[] args) {
List<Friend> list = new ArrayList<Friend>(5);
String targetCaption = "match";
list.add(new Friend("match"));
list.add(new Friend("non-match"));
list.add(new Friend("match"));
list.add(new Friend("non-match"));
list.add(new Friend("match"));
System.out.println("Before:");
for (Friend f : list) {
System.out.println(f.getFriendCaption());
}
Iterator<Friend> it = list.iterator();
while (it.hasNext()) {
if (it.next().getFriendCaption().equals(targetCaption)) {
it.remove();
// If you know it's unique, you could `break;` here
}
}
System.out.println();
System.out.println("After:");
for (Friend f : list) {
System.out.println(f.getFriendCaption());
}
System.exit(0);
}
private static class Friend {
private String friendCaption;
public Friend(String fc) {
this.friendCaption = fc;
}
public String getFriendCaption() {
return this.friendCaption;
}
}
}
输出:
$ java ListExample
Before:
match
non-match
match
non-match
match
After:
non-match
non-match
这篇关于Java,使用Iterator搜索ArrayList并删除匹配的对象的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文