Array problem

[BS]

In the main I have a Array, how can i use the data from this array in a sub

[Dillinger4]

Do you mean somthing like this?

    class ArrayExample{ 
      public static void main(String[] args){

       String[] s = {"Hello","Whats's","up?"};
       printStrings(s); 
      
       
       }
      static void printStrings(String[] s){
        for(int i = 0; i < s.length; ++i){ 
           System.out.println(s[i]); 
        }
      } 
   }

[Dillinger4]

Some things that i would like to point out. Java is a pass by value language. Not a pass by refrence. First let me explain pass by refrence. When a variable is passed to a method a copy of that variable is passed. If the method modifies it's parameters those modifications are visible when the method returns.

Java does not do this. It is a pass by value language. For instance. The following code illustrates this point.

class Example{ 
      public static void main(String[] args){

       int i = 10; 
       printInt(i); 
       System.out.println(i);  // prints 10
               
       }
      static void printInt(int i){
          System.out.println(i); // prints 10
          i = 25;
          
      } 
   }

However when a refrence type is involved, the valus is passed by refrence. This is not the same as "pass-by-refrence". If java were a pass by refrence language, when a refrence type was passed to a method, it would be passed as a refrence to the refrence.

[Dillinger4]

If you notice in this block of code. When an array is passed to a method. It's contents are modified when the method returns.

 class ArrayExample{ 
      public static void main(String[] args){

       String[] s = {"Hello","Whats's","up?"};
       printStrings(s); 
       for(int i = 0; i < s.length; ++i){         
           System.out.println(s[i]);
         }
       
       }
      static void printStrings(String[] s){
         for(int i = 0; i < s.length; ++i){         
           System.out.println(s[i]);
         }
         s[2] = "down"; 
      } 
   }

[Dillinger4]

Heres another example. Even though we are modifying the contents of the variable i and returning that value from the method the contents of the variable were never changed.

    class Example{ 
      public static void main(String[] args){

       int i = 10;
       int k = 0;  
       k = printInt(i); 
       System.out.println(k);  // prints 10
               
       }
      static int printInt(int i){
          System.out.println(i); // prints 10
          i = 25;
          return i; 
      } 
   }