java实战1

import java.io.BufferedInputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Scanner;


public class Main
{
    public static void main(String[] args)
    {
        Scanner cin=new Scanner(new BufferedInputStream(System.in));
        Collection<String> Arr =new ArrayList<String> (Arrays.asList("A","B","C","D","E","F"));
        String[] strArray ={"G","H","I","J","K"};
        Arr.addAll(Arrays.asList(strArray));
        Collections.addAll(Arr,"M","N");
        final PrintStream cout=System.out;
        cout.println(Arr);
        
//        迭代容器中的每一个元素
        Iterator it=Arr.iterator();
        for(;it.hasNext();)
        {
            cout.print(it.next()+" ");
        }
        cout.println("");
        for(String i:Arr)
        {
            cout.print(i+" ");
        }
        cout.println("");
        
        Arr.remove("A");
        for(String i:Arr)
        {
            cout.print(i+" ");
        }
        cout.println("");
        
        Collection<String> Arr2=new ArrayList<String>( Arrays.asList("B","C","D","E"));
        Arr.retainAll(Arr2);
        for(String i:Arr)
        {
            cout.print(i+ " ");
        }
        cout.println("");
        Object[] o=Arr.toArray();
        cout.print(Arrays.deepToString(o));
        cout.println("");
        Arr.removeAll(Arr);
        cout.println(Arr.size()+" ");
        cout.println();
    }
}