Pass Arraylist as argument to function

Question

I have an arraylist A of Integer type  I created it as    ArrayList lt Integer gt  A   new ArrayList lt Integer gt       Now  I want to pass it as an argument to function AnalyseArray      How can I achieve this

User · Accepted Answer

public void AnalyseArray ArrayList lt Integer gt  array         Do something       ArrayList lt Integer gt  A   new ArrayList lt Integer gt     AnalyseArray A

User · Answer

The answer is already posted but note that this will pass the ArrayList by reference  So if you make any changes to the list in the function it will be affected to the original list also    lt access-modfier gt   lt returnType gt  AnalyseArray ArrayList lt Integer gt  list      analyse the list   return value     call it like this   x AnalyseArray list     or pass a copy of ArrayList   x AnalyseArray list clone

User · Answer

Define it as   lt return type gt  AnalyzeArray ArrayList lt Integer gt  list

User · Answer

It depends on how and where you declared your array list  If it is an instance variable in the same class like your AnalyseArray   method you don t have to pass it along  The method will know the list and you can simply use the A in whatever purpose you need   If they don t know each other  e g  beeing a local variable or declared in a different class   define that your AnalyseArray   method needs an ArrayList parameter  public void AnalyseArray ArrayList lt Integer gt  theList      and then work with theList inside that method  But don t forget to actually pass it on when calling the method AnalyseArray A    PS  Some maybe helpful Information to Variables and parameters

[java] Pass Arraylist as argument to function

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