java重寫排序方法

㈠ 用java重寫Comparator實現自定義排序

packagetest;

importjava.text.ParseException;
importjava.text.SimpleDateFormat;
importjava.util.Arrays;
importjava.util.Comparator;
importjava.util.Date;

publicclassTest
{
	publicstaticvoidmain(String[]args)
	{
		String[]array={
				"2014-04-01T15:47:33.273Z",
				"2014-04-01T15:47:33.444Z",
				"2014-04-01T15:47:33.614Z",
				"2014-04-06T19:43:03.202Z",
				"2014-04-06T19:43:03.274Z",
				"2014-04-06T19:43:03.372Z",
				"2014-04-06T19:43:03.416Z",
				"2014-09-26T18:49:34.024Z",
				"2014-09-26T18:49:34.026Z"
		};
		finalSimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
		Arrays.sort(array,newComparator<String>()
		{
			@Override
			publicintcompare(Stringo1,Stringo2)
			{
				try
				{
					Dated1=sdf.parse(o1);
					Dated2=sdf.parse(o2);
					if(d1.before(d2))
					{
						return1;
					}
					elseif(d1.after(d2))
					{
						return-1;
					}
					else
					{
						return0;
					}
				}
				catch(ParseExceptione)
				{
					e.printStackTrace();
					return0;
				}
			}
		});
		
		for(Stringstring:array)
		{
			System.out.println(string);
		}
	}
}

㈡ JAVA 字母排序，並插入字母後再次排序

import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;

public class Demo{

public static void main(String args[]){
ts = new TreeSet(new MyComp());
ts.add("C");
ts.add("A");
ts.add("B");
ts.add("E");
ts.add("F");
ts.add("D");
// Get an iterator
Iterator i = ts.iterator();
// Display elements
while(i.hasNext()) {
Object element = i.next();
System.out.print(element + " ");
}
System.out.println();
}
}

class MyComp<T> implements Comparator<T>{

public int compare(T a, T b) {
String aStr, bStr;
aStr = (String) a;
bStr = (String) b;
// reverse the comparison
return aStr.compareTo(bStr);
}
}