When an object is passed to a method, a copy of the object reference but not the object itself is made : Parameter « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » Parameter

1.25.4.When an object is passed to a method, a copy of the object reference but not the object itself is made

import java.util.*;



class MainClass {

  public static void main(String args[]) {

    Vector v = new Vector();

    v.add(new String("a"));

    v.add(new String("b"));

    v.add(new String("c"));

    System.out.println(v);

    modifyReference(v);

    System.out.println(v);

    modifyReferencedObject(v);

    System.out.println(v);

  }



  static void modifyReference(Vector v) {

    v = new Vector();

    v.add(new String("1"));

    v.add(new String("2"));

    v.add(new String("3"));

  }



  static void modifyReferencedObject(Vector v) {

    v.removeAllElements();

    v.add(new String("1"));

    v.add(new String("2"));

    v.add(new String("3"));

  }

}

1.25.Parameter
	1.25.1.	A method's parameter list is a comma-separated list of parameter declarations.
	1.25.2.	A parameter may be declared as final so that it may be accessed from within a local inner class.
	1.25.3.	When a primitive value is passed to a method, a copy of the value is made
	1.25.4.	When an object is passed to a method, a copy of the object reference but not the object itself is made
	1.25.5.	When an value argument is passed into a method, changes to the argument value in the method do not affect the original.
	1.25.6.	Create a Reference to a Primitive
	1.25.7.	Changing the object reference in a method
	1.25.8.	Calling method operates on an object via the reference value
	1.25.9.	Passing Object Reference Variables
	1.25.10.	Passing Primitive Variables

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