在Java中用Word反向字符串 [英] Reverse String Word by Word in Java

问题描述

我有以下代码逐字反转字符串，但我有一个问题，首先有人能指出如何使其更好的代码？第二，如何删除新字符串开头的空格。

I have the following code to reverse a string word by word, I have a question though, first could anyone point at how to make it better code? and second, how can I remove the space that I end up with at the beginning of the new string.

String str = "hello brave new world";
tStr.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;
    }

此刻的短语变为：

olleh evarb wen dlrow

olleh evarb wen dlrow

注意新字符串开头的空格。

notice the space at the beginning of the new string.

推荐答案

不使用split函数代码如下：

Not using the split function the code would look like:

public static void reverseSentance(String str) {
    StringBuilder revStr = new StringBuilder("");
    int end = str.length(); // substring takes the end index -1
    int counter = str.length()-1;
    for (int i = str.length()-1; i >= 0; i--) {     
        if (str.charAt(i) == ' ' || i == 0) {
            if (i != 0) {
                revStr.append(str.substring(i+1, end));
                revStr.append(" ");
            }
            else {
                revStr.append(str.substring(i,end));
            }
            end = counter;
        }
        counter--;
    }
    System.out.println(revStr);
}

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