map-traversal.java

package com.tikitoo.demo.app2;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * 参考：
 *   http://javahowto.blogspot.com/2006/06/4-ways-to-traverse-map.html
 * Created by tikitoo on 1/6/15.
 */
public class ListRemoveDuplicates {
    
    private static final Integer HTTP_NOT_FOUND = 404;
    private static final Integer HTTP_OK= 200;
    private static final Integer HTTP_SERVER_ERROR = 505;
    
    public static void main(String[] args) {
        Map<Integer, String> data = new HashMap<Integer, String>();
        data.put(HTTP_NOT_FOUND, "HTTP_NOT_FOUND");
        data.put(HTTP_OK, "HTTP_OK");
        data.put(HTTP_SERVER_ERROR, "SERVER_ERROR");
        
        // 第一种
        Set<Map.Entry<Integer, String>> entrySet = data.entrySet();
        for (Map.Entry<Integer, String> entry : entrySet) {
            Integer key = entry.getKey();
            String value = entry.getValue();
            System.out.println(key + ": " + value);
        }

        // 第二种
        for (Integer key : data.keySet()) {
            String value = data.get(key);
            System.out.println(key + ": " + value);

        }
    }
}