Java Object Reference and Java Methods -

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I am unable to understand how it works 

  public Zero addToRule ( Rule r) {If (GetRuleList (.) Contains (R)) {getRuleList (). AddElement (r); }}   
 If I run this code:  
  obj.addToRule (r); Println (. GetRuleList () included (R));   
 It prints  true  how can it be?  
 btw ruleList is a vector member of the main category and this is not a stable variable (does not seem to be so but sharing anyway).  
  import java.util.Vector; Public Class RuleEngine {Private Vector Rule List = New Vector (); Public vector getRuleList () {return rule list; } Public Zero AddToRule (Rule R) {If (GetRuleList (.!) (R)) getRuleList (). AddElement (R); } Public static zero major (string algos []) {RuleEngine re = new RuleEngine (); Rules R = New Rule ("Rule 1"); Re.addToRule (r); Println (.re.getRuleList () includes (R)); }} Class rules {public string name = ""; Public rule (string name) {this.name = name; }}   
 Okay people have told me that this works because of passage in the context of Java. I got it. But instead of its context, what can I do to get a copy of that item?   
 
 
 From your comments it seems that you have not fully understood that there is a value and context in Java What is the difference between Originally, the objects are always passed as references in Java.  
 Consider  
  class test {Private list list = new Arrayist (); Public list getlist () {return list; }}   
  getList ()  method will return a  reference  to the  list  object. This will return a copy of the  no   list  object  
  test test = new test (); String S = "ABC"; . Add test.getList (); Println (. Test.getList) contains (s));   
 The first time the  getList ()  is called, a  give feedback  is returned to the list, since then the truth will return The second time  getList ()  is called, it returns  context  to the same list, which is the  junk (s)  is applicable; That's a copy, not a new list - the same reference.  s  was added, on which  s  was added.  
 Consider this, though     
  test test 1 = new test (); Test test2 = new test (); String S = "ABC"; Test1.add (s); Println (. Test2.getList () includes (s));   
 Why would this "false" print? Returns a reference to the list inside  test1.getList ()   test1  and references the  test2.getList ()  list to  test2 . Here,  s  was added to the test1: s list, so it will not be included in the test2: s list.

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