Passing array to a method (Java)

Question

I have a program that accepts a number that represents an array index and a String to replace the array element corresponding to the index.

Here is my code:

public static void main(String args[]){

    String names[]={"Alvin", "Einstein", "Ace", "Vino", "Vince"};

          for(int i=0; i<names.length;i++)
                 System.out.println(i + " - " + names[i]);

    replaceArrayElement(names);
}

   public static void replaceArrayElement(String name[]){

       int index = 0;
       String value = "";

       Scanner scan = new Scanner(System.in);

       System.out.print("\nEnter the index to be replaced:");
       index = scan.nextInt();

       if(index<name.length){

           System.out.print("Enter the new value:");
           value = scan.nextLine();

           name[index] = scan.nextLine(); 

           System.out.println("\nThe new elements of the array are");

           for(int j=0; j<name.length;j++)
               System.out.println(name[j]);
       } 
       else{     
            System.out.println("Error!");    
       }  
   }

What I need to do is to put the int index variable and String value variable inside the method replaceArrayElement as a parameters. But I don't know how to call a method with different data type parameters. Can somebody show me how?? Thank you.

Jon Skeet · Accepted Answer · 2012-06-14 06:18:44Z

5

Well it's not clear where you'd get the values to pass in from, but here's how you would declare the method:

public static void replaceArrayElement(String[] name, int index, String value)

You'd call it with:

// Get the values from elsewhere, obviously
replaceArrayElement(array, 5, "fred");

Note that I've used String[] name instead of String name[] - while the latter syntax is permitted, it's strongly discouraged as a matter of style.

answered Jun 14, 2012 at 6:18

Jon Skeet

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Comments

Pramod Kumar · Accepted Answer · 2012-06-14 06:22:09Z

0

Declare replaceArrayElement as follows -

public static void replaceArrayElement(int index, String value, String[] name)

and call it as -

replaceArrayElement(2, "Einstein2", names);

answered Jun 14, 2012 at 6:22

Pramod Kumar

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Comments

Alpesh Prajapati · Accepted Answer · 2012-06-14 06:26:17Z

0

  public static void main(String args[]){

String names[]={"Alvin", "Einstein", "Ace", "Vino", "Vince"};

          for(int i=0; i<names.length;i++)
                 System.out.println(i + " - " + names[i]);

    replaceArrayElement(3,"alpesh",names);
}

   public static void replaceArrayElement(int index, String replacename, String names[]){


       if(index<names.length){

           names[index] = replacename;

           System.out.println("\nThe new elements of the array are");

           for(int j=0; j<names.length;j++)
               System.out.println(names[j]);
       } 
       else{     
            System.out.println("Error!");    
       }  
   }

answered Jun 14, 2012 at 6:26

Alpesh Prajapati

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2 Comments

jhedmendoza Over a year ago

The new value of the array will be coming from the user input. Is it necessary to put another value for the name and index in the method when calling it?? i.e replaceArrayElement(3,"alpesh",names);

Alpesh Prajapati Over a year ago

it is just example . you can change it what you want accordingly

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