passareference.java

《A first book of java》by Gary J.Bronson 北大出版社

public class PassAReference
{
  public static void main(String[] args)
  {
    String s1 = "Original Message";
   
    display(s1);   // call the method
  }  // end of main() method
  public static void display(String msg)
  {             
     
    System.out.println("From within display(): " + msg);
  }
}  // end of class