Selection Sort For Numbers

import java.io.*;
class SelectionSortForNumbers
{
int i,j,z;
int k,t;
void input()throws IOException
{
BufferedReader x=new BufferedReader(new InputStreamReader(System.in));
System.out.println("How many numbers do you want to enter?");
int n=Integer.parseInt(x.readLine());
    int a[]=new int [n];
for(int i=0;i<n;i++)
{
System.out.print("Enter a number ");
a[i]=Integer.parseInt(x.readLine());
}
for(int i=0;i<n;i++)
{
k=a[i];
z=i;
for(int j=i+1;j<n;j++)
{
if(a[j]<k)
{
k=a[j];
z=j;
}
}
t=a[i];
a[i]=a[z];
a[z]=t;
}
for(int i=0;i<n;i++)
System.out.print(a[i]+" ");
}
public static void main (String[] args)throws IOException
{
SelectionSortForNumbers call=new SelectionSortForNumbers();
call.input();
    }
}