();
a.put("apple", 10);
a.put("banana", 20);
a.put("melon", 30);
System.out.println(a.get("apple"));
System.out.println(a.toString() + "\n");
a.put("JSP", 51);
a.replace("apple", 81);
System.out.println(a.toString());
a.remove("melon");
System.out.println(a.toString());
}
}">
package ch10.collection.Map;
import java.util.HashMap;
public class Ex01 {
public static void main(String[] args) {
HashMap<String, String> map=new HashMap<String, String>();
map.put("Spring", "봄");
map.put("Summer", "여름");
map.put("Fall", "가을");
map.put("Winter", "겨울");
System.out.println(map.get("Fall"));
System.out.println(map.toString() + "\\n");
HashMap<Integer, Double> h=new HashMap<Integer, Double>();
h.put(10, 63.5);
h.put(20, 68.5);
h.put(30, 66.5);
System.out.println(h.get(10));
System.out.println(h.toString() + "\\n");
HashMap<String, Integer> a=new HashMap<String, Integer>();
a.put("apple", 10);
a.put("banana", 20);
a.put("melon", 30);
System.out.println(a.get("apple"));
System.out.println(a.toString() + "\\n");
a.put("JSP", 51);
a.replace("apple", 81);
System.out.println(a.toString());
a.remove("melon");
System.out.println(a.toString());
}
}
가을
{Winter=겨울, Summer=여름, Fall=가을, Spring=봄}
63.5
{20=68.5, 10=63.5, 30=66.5}
10
{banana=20, apple=10, melon=30}
{banana=20, apple=81, JSP=51, melon=30}
{banana=20, apple=81, JSP=51}