CODEWITHSUNDEEP
javaarraysgenerics
javajava
javajava

Reputation: 1

java tolowercase with using ascii code in generic array

I am trying to create tolowercase method with using ascii code. I found this code:

public void toLowerCase(){
    for (int i = 0; i<arraySize; i++){
      char aChar = myarray[i].charAt(0);
      if (65 <= aChar && aChar<=90){
        aChar = (char)( (aChar + 32) ); 
      }
      System.out.print(aChar);
    }
}

But myarray is generic array so, charAt gives an error

The method charAt(int) is undefined for the type T

How can i fix this? I try to create a new array of String and convert generic array to new array but it does not work. How can i convert generic array to string array or how can i create tolowercase method with using ascii code in generic array?

Upvotes: 0

Views: 758

Answers (2)

Peter Lawrey
Peter Lawrey

Reputation: 533690

Unless it's a class or interface which has a charAt method you have nothing to call. What you can do is make your generic type T extends CharSequence and you will be able to use charAt as the CharSequence interface has this method.

Classes which implement CharSequence include String, StringBuffer and StringBuilder.

How can i convert generic array to string array or how can i create tolowercase method with using ascii code in generic array?

You can do this

T[] myarray = {"to", "be", "or", "not", "TO", "be"};
String[] strs = (String[]) myarray;

though it would be much simpler to do

String[] myarray = {"to", "be", "or", "not", "TO", "be"};

Upvotes: 2

Pritam Banerjee
Pritam Banerjee

Reputation: 18933

This is what should do your job:

char myarray[] = {'A','F'};
int arraySize = 2;
for (int i = 0; i<arraySize; i++){
     char aChar = myarray[i];
     if (65 <= aChar && aChar<=90){
        aChar = (char)( (aChar + 32) ); 
     }

      System.out.print(aChar);
    }
 }

Why do you need the charAt()?

You are using a character array. If you use a string array then you can try to use that.

For a String array you can do something like this(if you don't want to use toLowerCase()):

public static void toLowerCaseString(){

    String myStringArray[] = {"Something","Nothing"}; 

    for (int i = 0; i<myStringArray.length; i++){
        for (int j = 0; j< myStringArray[i].length(); j++){
             char aChar = myStringArray[i].charAt(j);

             if (65 <= aChar && aChar<=90){
                aChar = (char)( (aChar + 32) ); 
             }
             System.out.print(aChar);
        }

     }
 }

Upvotes: 0

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