Question

我正在尝试使用String方法将String Array转换为split。当我尝试使用reverse方法单独反转数组的元素时，reverse方法甚至不会显示在Eclipse代码建议中。明确使用reverse，会发出错误The method reverse() is undefined for the type String。请帮忙！

public class Split {

    public static void main(String args[]){

        String temp;

        String names="Apple Banana Cabbage Daffodil";

        String[] words = names.split(" ");

        for (int i = 0; i < words.length; i++) {

            temp = words[i].reverse();

        }

    }

Answer 1

编译器消息很明确：reverse不是String的方法。

尝试：

String reverse = new StringBuilder(words[i]).reverse().toString();

Answer 2

String类型没有反向方法，但您可以自己完成：

public static void main(String args[]){

            String temp;

            String names="Apple Banana Cabbage Daffodil";

            String[] words = names.split(" ");
            String[] reverseWords = new String[words.length];
            int counter = words.length - 1;
            for (int i = 0; i < words.length; i++) {
                reverseWords[counter] = new String(words[i]);
                counter--;
            }
            words = reverseWords;
            for(String i : words)
            {
                System.out.print(" " + i);
            }

        }

Answer 3

没有为reverse类型定义String方法。您可以在List上使用Collections#reverse来反转其元素：

String[] words = names.split(" ");

List<String> wordList = Arrays.asList(words);
Collections.reverse(wordList);

Answer 4

因为String没有方法反向，所以你可以使用 StringBuilder 。

像：

public static void main(String[] args) {

    String temp;

    String names = "Apple Banana Cabbage Daffodil";

    String[] words = names.split(" ");

    for (int i = 0; i < words.length; i++) {

        temp = new StringBuilder(words[i]).reverse().toString();
    }
}

将String转换为String Array后无法反转String

4 个答案: