Comparable接口与Comparator接口的对比

1. Comparable接口与Comparator接口的对比
   comparable指定了比较方法在待比较的类中，直接利用Collections.sort()或Arrays.sort()排序就可以了。
   comparator则是指定了比较的行为，可以作为Collections.sort()或Arrays.sort()方法的参数

2.代码：
Comparable

public class Person implements Comparable<Person>
{
	private Integer id;
	private String name;
	private Integer age;
	public Person()
	{
	}
	
	public Person(Integer id, String name, Integer age)
	{
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public Integer getId()
	{
		return id;
	}
	public void setId( Integer id )
	{
		this.id = id;
	}
	public String getName()
	{
		return name;
	}
	public void setName( String name )
	{
		this.name = name;
	}
	public Integer getAge()
	{
		return age;
	}
	public void setAge( Integer age )
	{
		this.age = age;
	}
	@Override
	public int compareTo( Person o )
	{
		return this.getAge().compareTo( o.getAge() );
	}
	
	
}

Comparator

import java.util.Comparator;

public class PersonComparetor implements Comparator<Person>
{

	@Override
	public int compare( Person o1, Person o2 )
	{
		return o1.getAge().compareTo( o2.getAge() );
	}


}

Datas

import java.util.ArrayList;
import java.util.List;

public class PersonsSingle
{
	private static List<Person> persons = null;
	private PersonsSingle()
	{
	}
	
	public static List<Person> getPersons(){
		persons = new ArrayList<Person>();
		persons.add( new Person( 1, "张三",26 ) );
		persons.add( new Person( 2, "王五",20 ) );
		persons.add( new Person( 3, "赵六",29 ) );
		persons.add( new Person( 4, "李四",26 ) );
		persons.add( new Person( 5, "周公",50 ) );
		return persons;
	}
}

Test

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class CollectionsTest
{
	public void sort(){
		double array[] = {112, 111, 23, 456, 231 }; 
		List list = new ArrayList();
		for (int i = 0; i < array.length; i++) { 
		list.add(new Double(array[i])); 
		} 
		Collections.sort(list); 
		for (int i = 0; i < array.length; i++) { 
		   System.out.println(list.get(i)); 
		}  
		System.out.println();
	}
	
	public void sortOne(){
		List<Person> list = PersonsSingle.getPersons();
		Collections.sort(list); 
		for (Person p: list) { 
		   System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		}  
		System.out.println();
	}
	
	public void sortTwo(){
		List<Person> list = PersonsSingle.getPersons();
		Collections.sort(list, new PersonComparetor()); 
		for (Person p: list) { 
		   System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		}  
		System.out.println();
	}
	
	public void shuffling(){
		List<Person> list = PersonsSingle.getPersons();
		//Collections.shuffling(list);
		Collections.shuffle(list); 
		for (Person p: list) { 
		   System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		}  
		System.out.println();
	}
	
	public void reverse(){
		List<Person> list = PersonsSingle.getPersons();
		Collections.reverse( list );
		for (Person p: list) { 
		   System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		}  
		System.out.println();
	}
	
	public void fill(){
		List<Person> list = PersonsSingle.getPersons();
		Collections.fill( list, new Person(6,"傻根", 34) ); 
		for (Person p: list) { 
		   System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		}  
		System.out.println();
	}
	
	public void minOne(){
		List<Person> list = PersonsSingle.getPersons();
		Person p = Collections.min( list );
		System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		System.out.println();
	}
	
	public void minTwo(){
		List<Person> list = PersonsSingle.getPersons();
		Person p = Collections.min( list, new PersonComparetor() );
		System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		System.out.println();
	}
	
	public void maxOne(){
		List<Person> list = PersonsSingle.getPersons();
		Person p = Collections.max( list );
		System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		System.out.println();
	}
	
	
	public void maxTwo(){
		List<Person> list = PersonsSingle.getPersons();
		Person p = Collections.max( list, new PersonComparetor() );
		System.out.println(p.getId() + "\t" + p.getName() + "\t" + p.getAge()); 
		System.out.println();
	}
	
	public void lastIndexOfSubList(){
		//int count = Collections.lastIndexOfSubList(list,li); 
		double array[] = {112, 111, 23, 456, 231 }; 
		List list = new ArrayList(); 
		List li = new ArrayList(); 
		for (int i = 0; i < array.length; i++) { 
			list.add(new Double(array[i])); 
		} 
		double arr[] = {111}; 
		String str[] = {"dd","aa","bb","cc","ee"}; 
		for(int j=0;j<arr.length;j++){ 
			li.add(new Double(arr[j])); 
		} 
		int locations = Collections.lastIndexOfSubList (list,li); 
		System.out.println("====="+ locations); 
	}
	
	public void indexOfSubList(){
		//int count = Collections.indexOfSubList(list,li); 
		double array[] = {112, 111, 23, 456, 231 }; 
		List list = new ArrayList(); 
		List li = new ArrayList(); 
		for (int i = 0; i < array.length; i++) { 
		list.add(new Double(array[i])); 
		} 
		double arr[] = {111}; 
		String str[] = {"dd","aa","bb","cc","ee"}; 
		for(int j=0;j<arr.length;j++){ 
		li.add(new Double(arr[j])); 
		} 
		int locations = Collections.indexOfSubList(list,li); 
		System.out.println("====="+ locations); 
	}
	
	public void rotate(){
		double array[] = {112, 111, 23, 456, 231 }; 
		List list = new ArrayList(); 
		for (int i = 0; i < array.length; i++) { 
			list.add(new Double(array[i])); 
		} 
		Collections.rotate(list,-1); 
		for (int i = 0; i <list.size(); i++) { 
			System.out.println("list[" + i + "]=" + list.get(i)); 
		} 
	}
	/**
	 * @desc 
	 * @param args
	 */
	public static void main( String[] args )
	{
		// TODO Auto-generated method stub
		CollectionsTest test = new CollectionsTest();
		//排序
		test.sort();
		test.sortOne();
		test.sortTwo();
		
		//混排
		test.shuffling();
		
		
		//反转
		test.reverse();
		
		//填充
		test.fill();
		
		//最小
		test.minOne();
		test.minTwo();
		
		//最大
		test.maxOne();
		test.maxTwo();
		
		//
		test.lastIndexOfSubList();
		
		//
		test.indexOfSubList();
		
		//
		test.rotate();
	}

}