Java集合架构____Map工具类

朱雀 2022-06-06 11:09 218阅读 0赞

package com.frame.base.utils.data;
    
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.Map;
    import java.util.TreeMap;
    import java.util.Map.Entry;
    
    /**
     * @author Administrator
     * Map Tools
     */
    public class MapUtil {
    	
    	/**
    	 * {a=day3, b=day1, c=day4}
    	 * @param map
    	 * @return
    	 */
    	public static Map<String,Object> getSortMap(Map<String,Object>map){
    		TreeMap<String, Object> sortMap = new TreeMap<String, Object>();
    		Iterator<Entry<String, Object>> iter = map.entrySet().iterator();
    		while (iter.hasNext()) {
    			Entry<String, Object> en = iter.next();
    			sortMap.put(en.getKey(), en.getValue());
    		}
    		return sortMap;
    	}
    	/**
    	 * a=day3&b=day1&c=day4
    	 * @param map
    	 * @return
    	 */
    	public static String  getSortMapFormStr(Map<String,Object>map){
    		TreeMap<String, Object> tree = new TreeMap<String, Object>();
    		Iterator<Entry<String, Object>> it = map.entrySet().iterator();
    		while (it.hasNext()) {
    			Entry<String, Object> en = it.next();
    			tree.put(en.getKey(), en.getValue());
    		}
    		it = tree.entrySet().iterator();
    		StringBuffer sf = new StringBuffer();
    		while (it.hasNext()) {
    			Entry<String, Object> en = it.next();
    			sf.append(en.getKey() + "=" + en.getValue() + "&");
    		}
    		return sf.substring(0, sf.length() - 1);
    	}
    
    	/**
    	 * test
    	 */
    	public static void main(String[] args) {
    		HashMap<String, Object> map =new  HashMap<String, Object>();  
    			map.put("b",1.0);  
    			map.put("c","day4");  
    			map.put("a","day3");  
    		System.out.println("1.对map进行排序:"+getSortMap(map));
    		System.out.println("2.对map进行表单格式拼装:"+getSortMapFormStr(map));
    		
    		
    	}
    }

//运行结果

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[Center]: /images/20220606/69fe34c94bb747a98e3f9583f428863f.png