如何从 ArrayList 中删除空白项.无需删除索引 [英] how to remove blank items from ArrayList.Without removing index wise

问题描述

public class ArrayListTest {

    public static void main(String[] args) {
        ArrayList al=new ArrayList();
        al.add("");
        al.add("name");
        al.add("");
        al.add("");
        al.add(4, "asd");
        System.out.println(al);
    }
}

o/p [, 姓名, , , asd]欲望 O/p [name,asd]

o/p [, name, , , asd] desire O/p [name,asd]

推荐答案

您可以使用 removeAll(Collection c) :

You can use removeAll(Collection<?> c) :

删除此集合的所有元素，这些元素也包含在指定集合

Removes all of this collection's elements that are also contained in the specified collection

al.removeAll(Arrays.asList(null,""));

这将删除List中所有null或等于""的元素.

This will remove all elements that are null or equals to "" in your List.

输出:

[name, asd]

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