Java Program To Find all the Subsets of a String

In this article, we will understand how to find all the subsets of a string. String is a datatype that contains one or more characters and is enclosed in double quotes(“ ”). A part or a subset of string is called substring.

Below is a demonstration of the same −

Suppose our input is −

The string is defined as: JVM

The desired output would be −

The subsets of the string are:
J
JV
JVM
V
VM
M

Algorithm

Step 1 - START
Step 2 - Declare namely
Step 3 - Define the values.
Step 4 - Initialize a temporary variable to increment after every iteration.
Step 5 - Iterate through the length of the string using two nested loops.
Step 6 - Find substring between a given range, and increment the temporary variable after every iteration.
Step 7 - Display the substrings using a loop.
Step 8 - Stop

Example 1

Here, we bind all the operations together under the ‘main’ function.

public class Demo {
   public static void main(String[] args) {
      String input_string = "JVM";
      int string_length = input_string.length();
      int temp = 0;
      System.out.println("The string is defined as: " +input_string);
      String string_array[] = new String[string_length*(string_length+1)/2];
      for(int i = 0; i < string_length; i++) {
         for(int j = i; j < string_length; j++) {
            string_array[temp] = input_string.substring(i, j+1);
            temp++;
         }
      }
      System.out.println("The subsets of the string are: ");
      for(int i = 0; i < string_array.length; i++) {
         System.out.println(string_array[i]);
      }
   }
}

Output

The string is defined as: JVM
The subsets of the string are:
J
JV
JVM
V
VM
M

Example 2

Here, we encapsulate the operations into functions exhibiting object-oriented programming.

public class Demo {
   static void subsets(String input_string){
      int string_length = input_string.length();
      int temp = 0;
      String string_array[] = new String[string_length*(string_length+1)/2];
      for(int i = 0; i < string_length; i++) {
         for(int j = i; j < string_length; j++) {
            string_array[temp] = input_string.substring(i, j+1);
            temp++;
         }
      }
      System.out.println("The subsets of the string are: ");
      for(int i = 0; i < string_array.length; i++) {
         System.out.println(string_array[i]);
      }
   }
   public static void main(String[] args) {
      String input_string = "JVM";
      System.out.println("The string is defined as: " +input_string);
      subsets(input_string);
   }
}

Output

The string is defined as: JVM
The subsets of the string are:
J
JV
JVM
V
VM
M