在Java中反转给定字符串中的单词

让我们看看在不使用任何 String 库函数的情况下，在Java中反转给定 String 的单词的方法

例子：

Input : "Welcome to geeksforgeeks"
Output : "geeksforgeeks to Welcome"

Input : "I love Java Programming"
Output :"Programming Java love I"

先决条件： Java中的正则表达式

// Java Program to reverse a String
// without using inbuilt String function
import java.util.regex.Pattern;
public class Exp {
  
    // Method to reverse words of a String
    static String reverseWords(String str)
    {
  
        // Specifying the pattern to be searched
        Pattern pattern = Pattern.compile("\\s");
  
        // splitting String str with a pattern
        // (i.e )splitting the string whenever their
        //  is whitespace and store in temp array.
        String[] temp = pattern.split(str);
        String result = "";
  
        // Iterate over the temp array and store
        // the string in reverse order.
        for (int i = 0; i < temp.length; i++) {
            if (i == temp.length - 1)
                result = temp[i] + result;
            else
                result = " " + temp[i] + result;
        }
        return result;
    }
  
    // Driver methods to test above method
    public static void main(String[] args)
    {
        String s1 = "Welcome to geeksforgeeks";
        System.out.println(reverseWords(s1));
  
        String s2 = "I love Java Programming";
        System.out.println(reverseWords(s2));
    }
}

输出：

geeksforgeeks to Welcome
Programming Java love I

您可以在此处找到在字符串中反转单词的 c++ 解决方案