List <E>, Set <E> and Map <K, E> simple application

Topic one:

Create two linear form, are stored { "chen", "wang", "liu", "zhang"} and { "chen", "hu", "zhang"}, intersection of these two tables and linear and set.

Code:

List_Test.java

 1 /**
 2  * 利用List<E>和Set<E>，求交集和并集;
 3  */
 4 package cn.edu.ccut1;
 5 import java.util.*;
 6 
 7 public class Test_List {
 8 
 9     public static void main(String[] args) {
10         ArrayList<String> L1 = new ArrayList<String>();
11         ArrayList<String> L2 = new ArrayList<String>();
12         L1.add("chen");
13         L1.add("wang");
14         L1.add("liu");
15         L1.add("zhang");
16         L2.add("chen");
17         L2.add("Hu");
18         L2.add("zhang");
19         ArrayList<String> Jj = new ArrayList<String>();
20         Jj.addAll(L1);
21         Jj.retainAll(L2); //Jj with the same elements in L2 is not all removed; 
22 is          the System. OUT .println ( " Intersection is: " + Jj.toString ());
 23 is          HashSet <String> of Bj = new new HashSet <String> ();
 24          of Bj .addAll (Ll);
 25          Bj.addAll (L2 of); // use set <E> and unique features elements acquire and remove duplicate set; 
26 is          the System. OUT .println ( " and set is: " + Bj.toString ());    
 27      }
 28 }

operation result: