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 stubList <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;  }
}