Selection sort

/*
 *Write a program to implement selection sort on a list of names and numbers according to user's choice
 */
import java.io.*;
class sel_sort
{
public void main()throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter your choice \n 1.Sorting names \n 2.Sorting numbers");
int ch=Integer.parseInt(br.readLine());
switch(ch)
{
case 1:System.out.print("Enter number of names:");
int n=Integer.parseInt(br.readLine());
String s[]=new String[n];
System.out.println("Enter names");
for(int i=0;i<n;i++)
s[i]=br.readLine();
int p;
String min,temp;
for(int i=0;i<n;i++)
{
min=s[i];
p=i;
for(int j=i+1;j<n;j++)
{
if(s[j].compareTo(min)<0)
{
min=s[j];
p=j;
}
}
temp=s[i];
s[i]=s[p];
s[p]=temp;
}
System.out.println("Sorted array");
for(int i=0;i<n;i++)
System.out.println(s[i]+" ");
break;
case 2:System.out.print("Enter number of numbers:");
int x=Integer.parseInt(br.readLine());
double a[]=new double[x];
System.out.println("Enter numbers");
for(int i=0;i<x;i++)
a[i]=Double.parseDouble(br.readLine());
int q;
double min2,temp2;
for(int i=0;i<x;i++)
{
min2=a[i];
q=i;
for(int j=i+1;j<x;j++)
{
if(a[j]<min2)
{
min2=a[j];
q=j;
}
}
temp2=a[i];
a[i]=a[q];
a[q]=temp2;
}
System.out.println("Sorted array");
for(int i=0;i<x;i++)
System.out.println(a[i]+" ");
break;
default:System.out.println("Wrong choice");
}
}}