CODEWITHSUNDEEP
javatreemap
snnlankrdsm
snnlankrdsm

Reputation: 1401

TreeMap doesn't sort

public int compareTo(Object o) {
    Doctor d = (Doctor)o;
    return (doctor_name.compareTo(d.doctor_name));
}

This is my comparable in Doctor class

jTextArea.setText("");
int doctor_id = Integer.parseInt(jTextField2.getText());
String doctor_name = jTextField3.getText();
String hospitalName = jTextField4.getText();

Doctor d = new Doctor(doctor_id,doctor_name,hospitalName);
hmDoctor.put(doctor_id, d);

This is my hashmap

and this is my tree map

TreeMap<Integer,Doctor> tmDoctor = new TreMap<Integer,Doctor>(hmDoctor);
jTextArea.setText("");
Set keys = tmDoctor.keySet();
Iterator<Integer> ite = keys.iterator();

while(ite.hasNext())
{
    int doctorID = ite.next();
    Doctor d = tmDoctor.get(doctorID);
    tmDoctor.put(doctorID, d);
    jTextArea1.append(d.toString());
}

It doesn't sort doctor names. Why?

Upvotes: 1

Views: 413

Answers (1)

Vlad
Vlad

Reputation: 18633

The TreeMap sorts elements according to their keys, not values. As an alternative, you could use a TreeMap<String, Doctor> indexed by the doctor's name. Or, depending on what you need to do, you can just keep the doctors in a TreeSet.

Upvotes: 10

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