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yet another java doubt...

Started by FreJa Nov 28, 2005 at 5:54 AM 1 replies 650+ views

Original Post

Nov 28, 2005 at 5:54 AM

Hi, I have this class:


public class Class1 {
   private int _id;
   private String _name;
  
   public Class1() {
      ...
   }
   ...
}

and i've created this collection:


Map<Integer, Class1> _stuff = new HashMap<Integer, Class1>();

now, i want to print _stuff into the screen, like:


_id - _name

but sorted alphabetically acording to _name. How can I do this? Huge thx

Oluseyi

Nov 28, 2005 at 6:01 AM

Sort the output, not the HashMap. Get all the entries as an array of Map.Entry elements and sort the array using your own comparator.

That's as much Java as I'm willing to consider.

Stani R

Nov 28, 2005 at 6:28 AM

You can use Arrays.sort(), but you'll have to have Class1 implement the Comparable interface.

Edit: Or pass a custom Comparator-derived class, as said above. For instance something like this (untested):

public class NameComparator implements Comparator {  public int compare(Object o1, Object o2) {    String s1 = ((Class1)o1).getName();    String s2 = ((Class1)o2).getName();    return s1.toLowerCase().compareTo(s2.toLowerCase());  }}

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