連想配列(HashMap,TreeMap)

import java.util.*;
 
class Test {
    public static void main(String[] args) {
        HashMap map = new HashMap();
         
        // map.put("キー", "値") ;
        map.put("name", "Hirose");
        map.put("score", 90);
        map.put("age", 15);
         
        System.out.println("name = " + map.get("name"));
        System.out.println("score = " + map.get("score"));
        System.out.println("age = " + map.get("age"));
    }
}

Iterator it = map.keySet().iterator();
while (it.hasNext()) {
    Object o = it.next();
    System.out.println(o + " = " + map.get(o));
}

TreeMap map = new TreeMap();
 
map.put("name", "Hirose");
map.put("score", 90);
map.put("age", 15);
 
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
    Object o = it.next();
    System.out.println(o + " = " + map.get(o));
}