用Java反转单词 [英] Reverse word in Java

问题描述

你好我想打印java reverse这个词，所以打印avaj。

Hello I want to print the word java reversed so it prints avaj.

推荐答案

你可以像这样反转Java中的String：

You can reverse a String in Java like this:

String s = "java";
String reversed = new StringBuilder(s).reverse().toString(); // "avaj"

我会采用不同的方式，因为我认为，OP是逻辑编程的新手（来自他/她的问题模式）。



在这里，我们遍历一个单词的长度并在打印时回溯它们，我的意思是逆转。看看吧。

I would go a different way as i assume, OP is new to logic programming(from his/her question pattern).

Here we are traversing through the length of a word and backtracking them while printing i mean reversing. Have a look at it.

String str = "java";
String revStr = reverseWordByWord(str);

 public String reverseWordByWord(String str){
        int strLeng = str.length()-1;
        String reverse = "", temp = "";

        for(int i = 0; i <= strLeng; i++){
            temp += str.charAt(i);
            if((str.charAt(i) == ' ') || (i == strLeng)){
                for(int j = temp.length()-1; j >= 0; j--){
                    reverse += temp.charAt(j);
                    if((j == 0) && (i != strLeng))
                        reverse += " ";
                }
                temp = "";
            }
        }
        return reverse;
    }

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