import java.io.*;
class SelectionSort
{
public static void main(String[] args)
{
try
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter name of the source file: ");
FileReader fr =new FileReader(br.readLine());
char[] buffer = new char[2048];
int len = fr.read(buffer);
String data = new String(buffer,0,len);
String[] element = data.split(",");
int[] a = new int[element.length];
System.out.println("\n\nBefore Sorting: ");
for(int i=0; i<a.length; i++)
{
a[i] = Integer.parseInt(element[i]);
System.out.print(a[i]+"\t");
}
int c=0,m=0; //variables to keep track of comparisons and moves
//Main logic of selection sort
for(int i=0; i<a.length-1; i++)
{
int min=i;
for(int j=i+1; j<a.length; j++)
{
c++;
if(a[min]>a[j])
min=j;
}
if(min!=i)
{
int temp = a[min];
a[min] = a[i];
a[i] = temp;
m+=3;
}
}
System.out.println("\n\nAfter Sorting: ");
for(int i=0; i<a.length; i++)
{
System.out.print(a[i]+"\t");
}
System.out.println("\n\nComparisons = " + c + "\tMoves = " + m);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
Sunday, 29 April 2012
Selection Sort in Java
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