Contoh Java Collection Map

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package com.brainmatics.java.fundamental.collection;

import java.util.Map;
import java.util.TreeMap;
import javax.swing.JOptionPane;

/**
 *
 * @author Student 5
 */
public class MapExample {
    public static void main(String[] args) {
        Map<String,String> mahasiswaMap = new TreeMap<String,String>();
       
        for(int i=0;i<3;i++){
            String mahasiswa =
                    JOptionPane.showInputDialog("Masukkan nama mahasiswa, harus unik!");
            String umur =
                    JOptionPane.showInputDialog("Masukkan umur "+ mahasiswa +":");
            mahasiswaMap.put(mahasiswa,umur);
        }
       
        for (String mahasiswa : mahasiswaMap.keySet()) {
            String umur = mahasiswaMap.get(mahasiswa);
            System.out.println("Nama : " + mahasiswa + ", umur : " + umur);
        }
    }
}