import java.util.Collections ;

import java.util.List ;

import java.util.Set ;

public class CollectionsDemo01{

    public static void main(String args[]){

        List<String> allList = Collections.emptyList() ;    // 返回空的 List集合

        Set<String> allSet = Collections.emptySet() ;    // 返回空的 List集合

        allList.add("Hello") ;    // 加入数据

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo02{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"MLDN","LXH","mldnjava") ;

        Iterator<String> iter = all.iterator() ;

        while(iter.hasNext()){

            System.out.print(iter.next() + "、") ;

        }

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo03{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"MLDN","LXH","mldnjava") ;

        Collections.reverse(all) ;    // 内容反转

        Iterator<String> iter = all.iterator() ;

        while(iter.hasNext()){

            System.out.print(iter.next() + "、") ;

        }

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo04{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"MLDN","LXH","mldnjava") ;

        int point = Collections.binarySearch(all,"LXH") ;    // 检索数据

        System.out.println("检索结果：" + point) ;

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo05{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"MLDN","LXH","mldnjava") ;

        if(Collections.replaceAll(all,"LXH","李兴华")){// 替换内容

            System.out.println("内容替换成功！") ;

        }

        System.out.print("替换之后的结果：") ;

        System.out.print(all) ;

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo06{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"1、MLDN","2、LXH","3、mldnjava") ;

        Collections.addAll(all,"B、www.mldn.cn") ;

        Collections.addAll(all,"A、www.mldnjava.cn") ;

        System.out.println("排序之前的集合：" + all) ;

        Collections.sort(all) ;

        System.out.println("排序之后的集合：" + all) ;

    }

};

import java.util.Collections ;

import java.util.List ;

import java.util.ArrayList ;

import java.util.Iterator ;

public class CollectionsDemo07{

    public static void main(String args[]){

        List<String> all = new ArrayList<String>() ;    // 返回空的 List集合

        Collections.addAll(all,"1、MLDN","2、LXH","3、mldnjava") ;

        System.out.println("交换之前的集合：" + all) ;

        Collections.swap(all,0,2) ;

        System.out.println("交换之后的集合：" + all) ;

    }

};