JAVA Pass Primitive type as a Reference to function call

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I am newbie in java. I need to pass primitive type value as a reference in function call.I dont want to return i value from function because it already returns some object.

for (int i = 0; i < objects.size();) {
  // here it should fetch that object based on i manipulated in function
  Object obj = objects.get(i)
  Object node = someFunction(session,obj,i);
  // push node in nodes array
public Object someFunction(Session session,Object obj,int i){
   //manipulate i value based on condition
      i = i + 1;
      i = i + 2;

How i can achieve this as JAVA use pass by value in function call?


Are you aware of java streams? With streams you can do something like:

List<Object> result =
     .filter(object -> {/*add condition here*/})
     .map(object->{/*do something with object that match condition above*/})

You can use this mechanism to collect and process objects based on certain conditions.

If that doesn't help, maybe use an iterator?

Iterator<Object> it = objects.iterator();
    Object node = someFunction(session,it);

public Object someFunction(Session session,Iterator i){
   //manipulate i value based on condition

How do I pass a primitive data type by reference?, For example, how do I make an int passed to a function modifiable. Answer. Java passes all primitive data types by value. This means that a copy is made, so that it​  “Passing by reference” refers to passing the real reference of the variable in memory. Learn more about Java. Get more quick code tips: Read all of Rafael's posts in the JavaWorld Java Challengers series. Learn more about mutable and immutable Java objects (such as String and StringBuffer) and how to use them in your code.

In java primitive types always pass by value. To pass by reference you should define a class and put your primitive type in it. If you pass Integer class it doesn't work because this class is immutable and value doesn't change.

How do I pass a primitive data type by reference?, In this Java Challenger, find out what happens when you pass an object reference to a method in Java. Like object types, primitive types are also passed by value. About Us · Contact · Privacy Policy · Cookie Policy · Member Preferences · Advertising · IDG Careers · Ad Choices · E-commerce Links  In Java, all primitives like int, char, etc are similar to C/C++, but all non-primitives (or objects of any class) are always references. So it gets tricky when we pass object references to methods. Java creates a copy of references and pass it to method, but they still point to same memory reference.

You can use a singular array of type int[] for a quick solution and increase its internal value. That doesn't change the array itself, only its content.

Does Java pass by reference or pass by value?, It means that while calling a method, parameters passed to the callee method will be When a parameter is pass-by-reference, the caller and the callee The Java Programming Language features eight primitive data types. However, in Java there are primitive types, which are not classes (i.e. int from your example), so you need to be careful. The real question is what you actually want to achieve here, otherwise it is difficult to answer:

Pass-By-Value as a Parameter Passing Mechanism in Java , actual parameter: the parameter that is given when the method is called. copies the contents of actual parameter into the formal parameter (i.e., pass-by-value). In call-by-reference evaluation (also referred to as pass-by-reference), a function receives an implicit reference to a variable used as argument, rather than a copy of its value. This typically means that the function can modify (i.e. assign to) the variable used as argument—something that will be seen by its caller.

Primitive vs. Reference Data Types, Methods. Passing variables of primitive data types into a method. In this case, a reference to the argument that is used for the call is passed to  The phrase "pass-by-reference" was originally "call-by-reference", and it was used to distinguish the argument passing semantics of FORTRAN (call-by-reference) from those of ALGOL-60 (call-by-value and call-by-name). In call-by-value, the argument expression is evaluated to a value, and that value is copied to the called method.

Java. Methods. Passing primitive types and objects into methods , See how Java's pass by value nature affects primitives, collections, and If the original type is not primitive, then a new reference or pointer is created Inside the method, we called lstParam.add(2), which actually tries to  This should not be confused with passing by reference: If the pointer were passed by reference, the variable foo would be an alias to someFoo and changing the object that foo points to would also change the object that someFoo points to. In this case, though, a copied pointer is passed into the function, and thus,