When a primitive value is passed to a method, a copy of the value is made : Parameter « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » Parameter 
1.25.3.When a primitive value is passed to a method, a copy of the value is made
class MainClass {
  public static void main(String args[]) {
    int i = 100;
    modifyMethod(i);
    System.out.println(i);
  }

  static void modifyMethod(int i) {
    i = i * 2;
  }
}
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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