java - Getting a single instance of an object -


Assume that I have a class A and the list of this class l < / Code>. There is a square B which increases A which will reach the list l , as shown below. In my program, there should be an example of class B (I am using singleton pattern), and should be just one example of the list l , so I want to do this I am doing: 

  Public abstract class A {secure list & lt; String & gt; L; Public A () {} Secure synchronized list & lt; String & gt; GetList () {if (l == faucet) l = New Linkedist & lt; String & gt; (); Returns L; }} // --- Extends the public class B {Personal Static B Example; Private B () {super (); } Public stable synchronization b getInstance () {if (example == faucet) Example = New B (); Return example; }}

What do I do:

b : 

  println (.super.getList () Shape ()); // should print super.getList (). Add ("a"); Println (. Super.getList () size ()); // will print   
  B : 
 
  In another example  .println (super.getList () .size ()); // 1 should print because I already added // "a", but prints 0 super.getList (). Add ("b"); Println (. Super.getList () size ()); // print 2, but print 1  
 
 is not working as expected. What am I doing wrong? Can anyone help me? 
 
 
 Edit: 
 
 Hi, Bill Lizard, here are two squares: 
 
  Public abstract class A {Protected static list & lt ; String & gt; L; Public A () {} Safe Stable Synchronization List & lt; String & gt; GetList () {if (l == faucet) l = New Linkedist & lt; String & gt; (); Returns L; }} // --- Extends the public class B {Personal Static B Example; Private B () {super (); } Public stable synchronization b getInstance () {if (example == faucet) Example = New B (); Return example; } Public Zero Metodo () {System.out.println (super.getList (). Size ()); . Super.getList () Adding ("A"); Println (. Super.getList () size ()); }}  
 
 And thus let me make an example of B: 
 
  public class ClassTeste {public static zero main (string [] args) {B} B = Bustest Instance (); B.metodo (); }}

I have run your main revised code with the following main method; < / P> 

 public static zero main (string [] args) {bb1 = bestsa instance (); B1.metodo (); BB2 = Bust Instance (); B2.metodo (); }

and found the following output, which matches what you searched for 

 0 1 1 2

-

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