Java Program to Generate All Possible Combinations Out of a, b, c, d, e

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This is a java program to generate and print all possible combinations out of a, b, c, d, e. The trick here is to start with one letter combinations, then with two letter combinations and so on.

Here is the source code of the Java Program to Generate All Possible Combinations Out of a, b, c, d, e. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. //This is a java program to print all possible combinations out of a, b, c, d, e
  2.  
  3. public class All_Possible_Combinatons 
  4. {
  5.     static void printCombinations(char[] sequence, int N) 
  6.     {
  7.         char[] data = new char[N];
  8.         for (int r = 0; r < sequence.length; r++)
  9.             combinations(sequence, data, 0, N - 1, 0, r);
  10.     }
  11.  
  12.     static void combinations(char[] sequence, char[] data, int start, int end,
  13.             int index, int r) 
  14.     {
  15.  
  16.         if (index == r) 
  17.         {
  18.             for (int j = 0; j < r; j++)
  19.                 System.out.print(data[j] + " ");
  20.             System.out.println();
  21.         }
  22.  
  23.         for (int i = start; i <= end && ((end - i + 1) >= (r - index)); i++) 
  24.         {
  25.             data[index] = sequence[i];
  26.             combinations(sequence, data, i + 1, end, index + 1, r);
  27.         }
  28.     }
  29.  
  30.     public static void main(String args[]) 
  31.     {
  32.         char[] sequence = { 'a', 'b', 'c', 'd', 'e' };
  33.         System.out.print("The combinations are: ");
  34.         printCombinations(sequence, sequence.length);
  35.     }
  36. }

Output:

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$ javac All_Possible_Combinatons.java
$ java All_Possible_Combinatons
 
The combinations are: 
a 
b 
c 
d 
e 
a b 
a c 
a d 
a e 
b c 
b d 
b e 
c d 
c e 
d e 
a b c 
a b d 
a b e 
a c d 
a c e 
a d e 
b c d 
b c e 
b d e 
c d e 
a b c d 
a b c e 
a b d e 
a c d e 
b c d e

Sanfoundry Global Education & Learning Series – 1000 Java Programs.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Youtube | Instagram | Facebook | Twitter