java list集合运算

list集合运算

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class ListDemo {

	public static void main(String[] args) throws IOException, ClassNotFoundException {
		// TODO Auto-generated method stub
		  List <String> listA = new ArrayList <String>();
		  listA.add("aa");
		  listA.add("bb");
		  listA.add("cc");
		  
		  List <String> listB = new ArrayList <String>();
		  listB.add("cc");
		  listB.add("dd");
		  listB.add("ff");
		  
		  List <String> listC = new ArrayList <String>();
        		  
		  listC = deepCopy(listA);
		  
		  //求并集
		  listA.addAll(listB);
		  System.out.println("--并集--" +listA);
		  //--并集--[aa, bb, cc, cc, dd, ff]
	
		  //交集
		  listA = deepCopy(listC); 
		  listA.retainAll(listB);
		  System.out.println("--交集--" +listA);
		  //--交集--[cc]
		 
		  
		  //差集
		  listA = deepCopy(listC); 
		  listA.removeAll(listB);
		  System.out.println("--差集--" +listA);
		  //--差集--[aa, bb]
		  

		  //无重复并集
		  listA = deepCopy(listC); 
		  listA.removeAll(listB);
		  listA.addAll(listB);
		  System.out.println("--无重复并集--" +listA);
		  //--无重复并集--[aa, bb, cc, dd, ff]

		  
	}
	
	public static <T> List<T> deepCopy(List<T> src) throws IOException, ClassNotFoundException {  
		/**
		 * 深拷贝
		 */
	    ByteArrayOutputStream byteOut = new ByteArrayOutputStream();  
	    ObjectOutputStream out = new ObjectOutputStream(byteOut);  
	    out.writeObject(src);  

	    ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());  
	    ObjectInputStream in = new ObjectInputStream(byteIn);  
	    @SuppressWarnings("unchecked")  
	    List<T> dest = (List<T>) in.readObject();  
	    return dest;  
	} 
}