Show all character ascending order from a word

import java.io.*;
public class ascending_str
{
public static void main()throws IOException
{
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
int i,j,l;
String m,p=" ";
char t;
char n[]=new char[20];
System.out.println("Enter any word");
m=br.readLine();
l=m.length();
for(i=0;i<l;i++)
n[i]=m.charAt(i);
{
for(i=0;i<(l-1);i++)
{
for(j=(i+1);j<l;j++)
{
if(n[i]>n[j])
{
t=n[i];
n[i]=n[j];
n[j]=t;
}
}
}
System.out.println("The alphabets in ascending order are");
for(i=0;i<l;i++)
p=p+n[i];
System.out.println(p);
}
}
}