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Jul 5, 2024 · Learn different ways to reverse a string in Java with examples, such as using StringBuilder, toCharArray, Collections, StringBuffer, and Stack. Compare the time complexity and auxiliary space of each method.
- 5 min
You can easily reverse a string by characters with the following example: Example. String originalStr = "Hello"; String reversedStr = ""; for (int i = 0; i < originalStr.length(); i++) { . reversedStr = originalStr.charAt(i) + reversedStr; } System.out.println("Reversed string: "+ reversedStr); Try it Yourself » Related Pages.
Learn different ways to reverse a string in Java using StringBuilder, StringBuffer, iteration and recursion. See code examples, output and explanations for each method.
public static String reverse(String input){ char[] in = input.toCharArray(); int begin=0; int end=in.length-1; char temp; while(end>begin){ temp = in[begin]; in[begin]=in[end]; in[end] = temp; end--; begin++; } return new String(in); }
- Overview
- A Traditional For Loop
- A StringBuilder
- Stream API
- Apache Commons
- Reversing The Order of Words in A Sentence
- Conclusion
- GeneratedCaptionsTabForHeroSec
In this quick tutorial, we’re going to see how we can reverse a Stringin Java. We’ll start to do this processing using plain Java solutions. Next, we’ll have a look at the options that third-party libraries like Apache Commons provide. Furthermore, we’ll demonstrate how to reverse the order of words in a sentence.
We know that strings are immutable in Java. An immutable object is an object whoseinternal state remains constant after it has been entirely created. Therefore, we cannot reverse a String by modifying it. We need to create another Stringfor this reason. First, let’s see a basic example using a for loop. We’re going to iterate over the String input ...
Java also offers some mechanisms like StringBuilder and StringBuffer that create a mutable sequence of characters. These objects have a reverse()method that helps us achieve the desired result. Here, we need to create a StringBuilder from the String input and then call the reverse()method:
The Stream APIprovides multiple convenient methods to reverse a given string. Let’s take a close look at each option.
Apache Commonsis a popular Java library with a lot of utility classes including string manipulation. As usual, to get started using Apache Commons, we first need to add the Maven dependency: The StringUtils class is what we need here because it provides the reverse() method similar to StringBuilder. One advantage of using this library is that its u...
Now, let’s assume we have a sentence with words separated by spaces and no punctuation marks. We need to reverse the order of words in this sentence. We can solve this problem in two steps: splitting the sentenceby the space delimiter and then concatenating the words in reverse order. First, we’ll show a classic approach. We’re going to use the Str...
In this tutorial, we’ve first looked at different ways of reversing a Stringin Java. We went through some examples using core Java and a popular third-party library like Apache Commons. Next, we’ve seen how to reverse the order of words in a sentence in two steps. These steps can also help achieve other permutations of a sentence. As usual, all the...
Learn different ways to reverse a string in Java using plain Java solutions, StringBuilder, Stream API, and Apache Commons. See code examples, tests, and explanations for each method.
Nov 29, 2022 · Learn how to reverse a string in Java using different techniques, such as loops, arrays, StringBuilder, and StringBuffer. See code examples, explanations, and output for each method.
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Jul 20, 2024 · Learn how to reverse a string in Java using static method, array, recursion, while loop and for loop. See the code, output and explanation for each method with examples.
