import java.util.HashMap;
/**
 * Map 存元素和取元素和刪除（put、get、remove）
 * @author 小治的高等數(shù)學(xué)
 *
 */
public class Map1 {
 public static void main(String[] args) {
   // 創(chuàng)建 HashMap 對(duì)象 Sites
        HashMap<String, String> sites = new HashMap<String, String>();
        // 添加鍵值對(duì)
        sites.put("1", "Google");
        sites.put("2", "Runoob");
        sites.put("3", "Taobao");
        sites.put("4", "Zhihu");
        // 輸出Map中所有元素
        System.out.println(sites);
        // 拿出Map中key的為1的value的值
        System.out.println(sites.get("1"));
        System.out.println(sites.get("3"));
        sites.remove("3");
        System.out.println(sites.get("3"));
        System.out.println(sites);
 }
}

package basics.map;
 
import java.util.HashMap;
import java.util.Map.Entry;
public class Map2 {
 public static void main(String[] args) {
   // 創(chuàng)建 HashMap 對(duì)象 Sites
        HashMap<Integer, String> sites = new HashMap<Integer, String>();
        // 添加鍵值對(duì)
        sites.put(4, "Zhihu");
        sites.put(1, "Google");
        sites.put(2, "Runoob");
        sites.put(3, "Taobao");
        sites.put(4, "Zhihu2");
        // 只循環(huán) key
        for (Integer i : sites.keySet()) {
            System.out.println("key: " + i + " value: " + sites.get(i));
        }
        // 只循環(huán) value 值
        for(String value: sites.values()) {
          // 輸出每一個(gè) value
          System.out.println(value + ", ");
        }
        
        // 循環(huán) key 和 value
        for (Entry<Integer, String> entry : sites.entrySet()) {
         System.out.println("只輸出key "+entry.getKey());
         System.out.println("只輸出value "+entry.getValue());
        }
        
        for (int i = 0; i <= sites.size(); i++) {
   System.out.println(sites.get(i));
  }
 }
}