In this article we learn the how to reverse a string in java with example. We can reverse a string in java by using StringBuilder, StringBuffer, iteration etc. Let’s see the all ways to reverse string in java.
How to Reverse a String in Java?
1. Reverse a String in Java By Using StringBuilder
First you have to know some interesting facts about String and StringBuilder classes:
- String objects are immutable.
- The String class in Java does not have a reverse() method, however, the StringBuilder class has a built-in reverse() method.
- The StringBuilder class does not have a toCharArray() method, while the String class has a toCharArray() method.
Step 1: Create a new class (For Example: ReverseAStringInJava).
Step 2: Write main method inside the class.
Step 3: Write the string in main method (String s1 = “java”;)
Step 4: Create a object of StringBuilder class (StringBuilder sb = new StringBuilder(s1);)
Step 5: Use StringBuilder class reverse() method.
Step 6: Print the reverse string.
Output:
avaj
2. Reverse a String in Java By Using StringBuffer
Step 1: Create a new class (For Example: ReverseAStringInJava).
Step 2: Write main method inside the class.
Step 3: Write the string in main method (String s1 = “java”;)
Step 4: Create a object of StringBuffer class (StringBuffer sb = new StringBuffer(s1);)
Step 5: Use StringBuffer class reverse() method.
Step 6: Print the reverse string.
Output:
avaj
3. Reverse a String in Java By Reverse Iteration
Step 1: Create a new class (For Example: ReverseAStringInJava).
Step 2: Write main method inside the class.
Step 3: Write the string in main method (String s1 = “java”;)
Step 4: Take another string in method (String rev = “”;)
Step 5: Calculate the length of string s1 by using length method and store it in variable l.
Step 6: Use for loop to do reverse iteration.
Step 7: Use charAt method and store this into string rev.
Step 8: Print the string rev outside the for loop.
Output:
avaj