Can java delete list elements?-JavaBase-php.cn

Can java delete list elements?

青灯夜游

Release： 2019-12-31 10:54:12

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Can java delete list elements?

Java can delete list elements. Here are some ways to delete list elements in Java.

Method 1: Use the remove() method of Iterator

public class Test {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("aa");
        list.add("bb");
        list.add("cc");
        Iterator<String> it = list.iterator();
        while(it.hasNext()){
            String str = (String)it.next();
            if("aa".equals(str)){
                it.remove();
            }        
        }
        System.out.println(list.size());
    }
}

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Method 2: Use the remove() method of List, pay attention to list.size() Position

public class Test {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("aa");
        list.add("bb");
        list.add("cc");
        for (int i = list.size() - 1; i >= 0; i--) {
            String str = list.get(i);
            if ("aa".equals(str)) {
                list.remove(str);
            }
        }
        System.out.println(list.size());
    }
}

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Method 3: Use CopyOnWriteArrayList

public class Test {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("aa");
        list.add("bb");
        list.add("cc");
        CopyOnWriteArrayList<String> cowList = new CopyOnWriteArrayList<String>(list);
        for (String str : cowList) {
            if ("aa".equals(str)) {
                cowList.remove(str);
            }
        }
        System.out.println(cowList.size());
    }
}

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