java實戰1

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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);        //        迭代容器中的每一個元素        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();    }}

 

java實戰1