Java Program - Reverse a given String
In Java, the reverse of a given string can be found out by using below mentioned methods.
Method 1: Using iteration
In the example below, the string called MyString is reversed using ReverseString() method. A variable last is created which points to the last character of the string. An empty string revString is created. By using a for loop and iterating from last to 0, characters from MyString is placed in revMystring in reverse order.
public class MyClass { static void ReverseString(String MyString) { int last = MyString.length() - 1; String revString = ""; for(int i = last; i >= 0; i--) { revString = revString + MyString.charAt(i); } System.out.println(revString); } public static void main(String[] args) { ReverseString("Hello World"); ReverseString("Programming is fun"); ReverseString("Reverse this string"); } }
The above code will give the following output:
dlroW olleH nuf si gnimmargorP gnirts siht esreveR
Method 2: Using Recursion
The above result can also be achieved using recursive method. Consider the example below:
public class MyClass { static void ReverseString(String MyString) { if ((MyString == null) || (MyString.length() <= 1)) { System.out.print(MyString); } else { System.out.print(MyString.charAt(MyString.length()-1)); ReverseString(MyString.substring(0,(MyString.length()-1))); } } public static void main(String[] args) { ReverseString("Hello World"); System.out.println(); ReverseString("Programming is fun"); System.out.println(); ReverseString("Reverse this string"); System.out.println(); } }
The above code will give the following output:
dlroW olleH nuf si gnimmargorP gnirts siht esreveR
Method 3: Printing the string in reverse order
The same can be achieved by printing the string in reverse order. Consider the example below:
public class MyClass { static void ReverseString(String MyString) { int last = MyString.length() - 1; for(int i = last; i >= 0; i--) { System.out.print(MyString.charAt(i)); } System.out.println(); } public static void main(String[] args) { ReverseString("Hello World"); ReverseString("Programming is fun"); ReverseString("Reverse this string"); } }
The above code will give the following output:
dlroW olleH nuf si gnimmargorP gnirts siht esreveR
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