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Selection Sort in JAVA

What is selection sort?

It is a sorting technique that is based on the partitioning of array into two parts, sorted and unsorted.

The process is:-

1) Find minimum element in unsorted array.
2) Swap the element at the end of sorted array.

when i=0 we don't have any sorted array so element will be replaced from first element later the sorted array end will growas the index.

Steps:-


underline elements are sorted array, the length is increasing with each minimum element added at the end.

minimum element11
 11 25 12 22 64 
minimum element12
 11 12 25 22 64 
minimum element22
 11 12 22 25 64 
minimum element25
 11 12 22 25 64 
minimum element64
 11 12 22 25 64 

Program:-


package sorting;

public class SelectionSort {

 //function to print array
  public static void print(int[] arr)
  {
   for(int i=0;i<=arr.length-1;i++)
    System.out.print(" "+arr[i]);
   System.out.println(" ");
  }
  
  //function to swap elements
  public static int[] swap(int[] arr,int i, int j)
  {
   int temp;
   temp=arr[i];
   arr[i]=arr[j];
   arr[j]=temp;
   
   return arr;
  }
 
  //program to find minimum element in unsorted array( i to end)
  public static int min(int[] arr,int i)
  {
   int min=i;
   for(;i<=arr.length-1;i++)
   {
    if(arr[i]<arr[min])
    {
     min=i;
    }
   }
   System.out.println("minimum element"+arr[min]);
   return min;
   
  }
  
  public static void main(String[] args)
  {
   int[] arr={64,25,12,22,11};
   int min;
   for(int i=0;i<=arr.length-1;i++)
   {
    //find minimum element in unsorted array ( i to end)
    min=min(arr,i);
    //swap minimum element with then end of sorted array(i)
    swap(arr,min,i);
    //print the array
    print(arr);
   
   }
   
   
   
  }
  
  
  
}

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What is bubble sort?

It is a sorting technique that is based on the comparison.Here we compare adjacent element, if the first element is larger than the second we swap each other. We do the same procedure again and again until array do not sort completely.

Example:-
5 1 4 2 8



51428here pass is nothing but iterating the loops equal to number of elements in the array but if it already sorted before then we can break the loop anddo existPASS1 case0 1 //check 0 and first element15428 case1 2 //check 1 and 2 element14528 case2 314258 case3 414258 swap istruePASS2 //first pass completed now do second pass case0 114258 case1 212458 case2 312458 case3 412458 swap istrue PASS3 // third pass case0 112458 case1 212458 case2 312458 case3 412458 swap isfalse since swap is false we break from the loop and do not go for fourth and fifth pass
Program:-

package sorting;publicclassBubbleSort{//function to print arraypublicstaticvoidprint(int[] arr){for(int i=0;i<=arr.length-1;i++) Syst…