convert array of numbers to array of words

Question

I'm trying to convert array of numbers to array of words for example:

{1,2} will converted to {"one","two"}

so this is the code that I write in java:

public static void main(String[] args) {

    ArrayList<Integer> list1 = new ArrayList<>(Arrays.asList(1,2));

    Integer [] list1Array = list1.toArray(new Integer[0]);
    int numLength2 = list1.size();
    for(int i = 0; i < numLength2; i++){
        System.out.println(list1Array[i]);
     }   
    System.out.println(numLength2);
    String n2 = ""; 
    for(int j = 0; j < numLength2; j++) {
       int element = list1.get(j);
       System.out.println(element);
       switch (element) {
              case '1': {  
                    n2 = n2 + "one";
                    break;
                }
              case '2': { 
                    n2 = n2 + "two";
                    break;
                }

                default: {
                    n2 = n2 + "zero";
                }
            }
        }
        System.out.println(n2);
    }
}

It works fine except the last print:

 System.out.println(n2);

The output here is zerozero while it should be onetwo. What's problem with code?

Mureinik · Accepted Answer · 2018-10-22 16:59:33Z

5

element is an int, but you're comparing it to a char literal. You should use int literals instead:

switch (element) {

    case 1: {  
        n2 = n2 + "one";

        break;
    }
    case 2: { 
        n2 = n2 + "two";
        break;
    }

    default: {
        n2 = n2 + "zero";
    }
}

answered Oct 22, 2018 at 16:59

Mureinik

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3 Comments

Michael Bruesch Over a year ago

@GNDevs If this solved your issue, please do consider selecting it as the Accepted Answer.

muklah Over a year ago

I will but there is a note says that I should wait 3 minutes until I can accept the answer @Mike Bruesch

muklah Over a year ago

@Mureinik sorry but in the question I said that I tried to convert numbers array to words array too and the result now is string so can I make the it array like{"one","two"}?

Laziji · Accepted Answer · 2018-10-22 17:01:35Z

1

case '1' , '1' is char type but element is int

answered Oct 22, 2018 at 17:01

Laziji

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Comments

Ilya · Accepted Answer · 2018-10-22 17:05:20Z

1

Also, if you change this line and the program will work:

int element = '0' + list1.get(j);

answered Oct 22, 2018 at 17:05

Ilya

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Comments

Pushpesh Kumar Rajwanshi · Accepted Answer · 2018-10-22 17:56:42Z

You could have achieved same through these few lines of codes instead of your forloop and switch.

public static void main(String[] args) {
    List<Integer> list1 = new ArrayList<>(Arrays.asList(1, 2, 5, 4));
    String[] numArray = { "zero", "one", "two", "three", "four", "five" };

    for (Integer num : list1) {
        System.out.print(numArray[num]);
    }
}

This prints,

onetwofivefour

Now as you said you want to create a list like {"one", "two"}, you can do something like this,

public static void main(String[] args) {
    List<Integer> list1 = new ArrayList<>(Arrays.asList(1, 2, 5, 4));
    String[] numArray = { "zero", "one", "two", "three", "four", "five" };
    List<String> wordList = new LinkedList<String>();

    for (Integer num : list1) {
        wordList.add(numArray[num]);
    }
    System.out.println(wordList); // prints [one, two, five, four]
}

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