Java Program To Reverse Words in a String
- July 06, 2020
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Java Program To Reverse Words in a String
In this Java Program, we will perform the reverse operation on the words in a string.
Logic : 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--)
{
reverseWord = reverseWord + word.charAt(j);
}
reversedString = reversedString + reverseWord + " ";
}
Step 1 : Create class ReverseWords
Step 2 : Create methods reverseWordInMyString(String str)
Step 3 : Create an array of String named words and store the result of split method.
str.split(" "); is a split method of string class which splits the string in several strings.
Step 4 : Create a variable reversedString = "";
Step 5 : Apply for loop in which variable i should be initialized to 0, i should be less than words.length and increment i.
Step 6 : In that for loop, create a variable word and store the result of words[i]. words[i] is the word from the for loop.
Step 7 : Create variable ReverseWord
Step 8 : Apply another for loop. Initialize j to word.length()-1, j should be greater than equal to 0 and decrement j.
Step 9 : Store the addition of the reverseWord and word.charAt(j) in the reverseWord variable.
The charAt(i) function returns the character at the given position in a string.
Step 10 : Close the for loop of j.
Step 11 : Store the result of reversedString + reverseWord + " " in the variable reverseString.
Step 12 : Close the for loop of i.
Step 13 : Print the String & reverseString.
Step 14 : Create the main method
Step 15 : Create the object of the ReverseWords Class
Step 16 : Call the method reverseWordInMyString of the ReverseWords Class.
Program :
public class ReverseWords
{
public void reverseWordInMyString(String str)
{
//The split() method of String class splits string in several strings
//based on the delimeter 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)
{
ReverseWords obj = new ReverseWords();
obj.reverseWordInMyString("Welcome to my channel");
obj.reverseWordInMyString("This is an easy Java Program");
}
}
Output :
Welcome to my channel
emocleW ot ym lennahc
This is an easy Java Program
sihT si na ysae avaJ margorP
For execution of the same do visit my YouTube Channel :
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