How are parameters passed in Java?

See this for detailed description.

In Java, parameters are always passed by value. For example, following program prints i = 10, j = 20.

//  Test.java 
class Test { 
   // swap() doesn't swap i and j 
   public static void swap(Integer i, Integer j) { 
      Integer temp = new Integer(i); 
      i = j; 
      j = temp; 
   } 
   public static void main(String[] args) { 
      Integer i = new Integer(10); 
      Integer j = new Integer(20); 
      swap(i, j); 
      System.out.println("i = " + i + ", j = " + j); 
   } 
} 

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