java阿里巴巴代码

				/**
				 * StringComparator.java
				 * 
				 * This class is used along with TreeMap
				 * When put a key into a TreeMap, TreeMap will replace the old having the same key with the new 
				 * but when you use this class, you can control this case
				 * though the key is the same, the Comparator will return false if you set the flag 'takeEqual=true'
				 */
				
				package tools.util;
				
				import java.util.Comparator;
				import java.util.Iterator;
				import java.util.TreeMap;
				
				public class StringComparator implements Comparator
				{
					private int takeEqual = 0;
					private boolean desc	= false;
				
					/**
					 * IntegerComparator, Constructor
					 * @param boolean takeEqual, if true, return 1 when equal, 
					 */
					public StringComparator(boolean takeEqual)
					{
						this.takeEqual = (takeEqual==true) ? 1 : 0;
					}
				
					/**
					 * StringComparator, Constructor
					 * @param boolean takeEqual, if true, return 1 when equal, 
					 * @param boolean desc
					 */
					public StringComparator(boolean takeEqual, boolean desc)
					{
						this.takeEqual = (takeEqual==true) ? 1 : 0;
						this.desc		= desc;
					}
				
					/**
					 * compare, compare 2 objects
					 * @param Object o1 
					 * @param Object o2
					 * @return int, 1 ==> o1 > o2, -1 ==> o1 < o2, 0 ==> o1 = o2
					 */
					public int compare(Object o1, Object o2)
					{
						String str1 = ((String)o1).toUpperCase();
						String str2 = ((String)o2).toUpperCase();
				
						if (!desc)		// ASC
						{
							if(str1.compareTo(str2) < 0) return -1;
							if(str1.compareTo(str2) > 0) return 1;
						}
						else			// DESC
						{
							if(str1.compareTo(str2) < 0) return 1;
							if(str1.compareTo(str2) > 0) return -1;
						}
				
						return takeEqual;
					}
					public boolean equals(Object obj)
					{
						return false;
					}
					static public void main(String[] args)
					{
						test(true);
						test(false);
					}
					static private void test(boolean flag)
					{
						System.out.println("\nflag: " + flag);
						TreeMap map = new TreeMap(new StringComparator(flag));
						String str1 = "string #1";
						String str2 = "string #2";
						String str3 = "string #2";
						String str4 = "string #4";
						map.put(str1, str1);
						map.put(str2, str2);
						map.put(str3, str3);
						map.put(str4, str4);
						
						for(Iterator it=map.values().iterator(); it.hasNext();)
						{
							String str = (String)it.next();
							System.out.println("str: " + str);
						}
					}
				}