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Java 程序:反转String中的单词

原文: https://beginnersbook.com/2017/09/java-program-to-reverse-words-in-a-string/

该程序反转字符串的每个单词并将反转的字符串显示为输出。例如,如果我们输入一个字符串"reverse the word of this string",那么程序的输出将是:"esrever eht drow fo siht gnirts"

要了解此程序,您应该具有以下 Java 编程主题的知识:

  1. Java for循环
  2. Java String split()方法
  3. Java String charAt()方法

示例:使用方法反转String中的每个单词

在本程序中,我们首先使用split()方法将给定的字符串拆分为子字符串。子串存储在String数组words中。程序然后使用反向的for循环反转子串的每个单词。

public class Example
{
   public void reverseWordInMyString(String str)
   {
	/* The split() method of String class splits
	 * a string in several strings based on the
	 * delimiter passed as an argument to it
	 */
	String[] words = str.split(" ");
	String reversedString = "";
	for (int i = 0; i < words.length; i++)
        {
           String word = words[i]; 
           String reverseWord = "";
           for (int j = word.length()-1; j >= 0; j--) 
	   {
		/* The charAt() function returns the character
		 * at the given position in a string
		 */
		reverseWord = reverseWord + word.charAt(j);
	   }
	   reversedString = reversedString + reverseWord + " ";
	}
	System.out.println(str);
	System.out.println(reversedString);
   }
   public static void main(String[] args) 
   {
	Example obj = new Example();
	obj.reverseWordInMyString("Welcome to BeginnersBook");
	obj.reverseWordInMyString("This is an easy Java Program");
   }
}

输出:

Welcome to BeginnersBook
emocleW ot kooBsrennigeB 
This is an easy Java Program
sihT si na ysae avaJ margorP

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