java如何在特定位置将字符串列表添加到另一个列表中？

Question

我有两个列表A，B。现在我想在列表A中添加B元素，索引为2，4，6

List<String> A = new ArrayList<>();
List<String> B = new ArrayList<>();

//A contains {"a","b","c","d","e","f","g"}
//B contains {"1","2","3","4"}

//Needed output is {"a","b","1","c","d","2","e","f","3","g"}

如何在java中实现这一点

Answer 1

您可以使用^{}方法来完成

请尝试以下代码：

public class Test {
    public static void main(String[] args) {
        List<String> A = new ArrayList<>();
        A.add("a");
        A.add("b");
        A.add("c");
        A.add("d");
        A.add("e");
        A.add("f");
        A.add("g");
        List<String> B = new ArrayList<>();
        B.add("1");
        B.add("2");
        B.add("3");
        B.add("4");

        int indToAdd = 2;
        for(int i = 0; i < B.size() && indToAdd < A.size(); i++) {
            A.add(indToAdd, B.get(i));
            indToAdd += 3;
        }
        System.out.println(A);
    }
}

main()方法调用的输出为：

[a, b, 1, c, d, 2, e, f, 3, g]