CODEWITHSUNDEEP
javaarrays
aretai
aretai

Reputation: 1641

want to combine values of an array with each other and display them

I have an array of ints (e.g. 0, 2, 4, 7). Each value from the array I'd like to combine with another value of the array so that there should be every combination possible(e.g. [0, 2], [0, 4], [0, 7] but also [2, 0], [4, 0] and [7,0] and same for rest of values). What is the best and most resources (processing) effective way to achieve that?

thank you

Upvotes: 0

Views: 109

Answers (2)

ziesemer
ziesemer

Reputation: 28697

int[] arr = [...];

for(int i : arr){
  for(int j : arr){
    // Do something with both "i and j".
  }
}

Within the processing point (the "do something" comment), you could do something as simple as printing the result, or adding the combination result to a new array or collection. (The later would be less ideal for performance reasons, as it would require all possible combinations to be stored in-memory at once - instead of processing the results as you generate them.)

Upvotes: 1

dku.rajkumar
dku.rajkumar

Reputation: 18578

iterate j from i+1

for (int i = 0; i < arr.length; i++) {
  for (int j = i+1; j < arr.length; j++) {
   System.out.println("["+arr[i] +","+arr[j]+"]");
   System.out.println("["+arr[j] +","+arr[i]+"]");
  }
}

EXAMPLE: enter image description here

Upvotes: 2

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