Looping to create a custom String

Question

I am looping to write data to an array of Strings. But what I want is that I create another loop where I will loop through the data of values as much as amount, but I would like to have some guidance on how to do so.

String[] s = new String[20];
String[] values = { "A", "B", "C", "D" };
final int amount = 2;

for (int i = 0; i < s.length; i++) {
    s[i] = String.format("%s%04d", values[0], i); //TODO create another loop?
}
System.out.println(Arrays.toString(s));

The preferred output should be:

A0000, A0001, B0002, B0003, C0004, ...

The actual output is:

A0000, A0001, A0002, A0003, A0004, ...

Please specify the the actual output, show the complete output you want. — mazhar islam
– mazhar islam, Commented Oct 6, 2015 at 9:44
Your "preferred" and "actual" outputs totally do not agree. Please reconcile this. — Tim Biegeleisen
– Tim Biegeleisen, Commented Oct 6, 2015 at 9:46
Still not clear, from where the I came into output IA20000? Why you used values[0] in String.format? What will be the purpose of "B", "C", "D" in values? — mazhar islam
– mazhar islam, Commented Oct 6, 2015 at 9:51
System.out.println(Arrays.toString(s)); would get you the desired output to some degree, but the code you've shared doesn't show what you put in the classes variable that you're using as output provider... — Filip
– Filip, Commented Oct 6, 2015 at 9:52

Rustam · Accepted Answer · 2015-10-06 09:55:00Z

2

Problem : your looping is wrong.

try this:

 public static void main(String[] args) {

          int k=0;
          String[] s = new String[20];
            String[] values = { "A", "B", "C", "D" };
            final int amount = 2;
            for (int i = 0; i < values.length; i++){

                 for (int j = 0; j < amount; j++){ //data of values as much as amount
                  s[k++] = String.format("%s%04d", values[i], k); 
                 }
            }
            System.out.println(Arrays.toString(Arrays.copyOf(s,k)));
     }

output:

[A0001, A0002, B0003, B0004, C0005, C0006, D0007, D0008]

answered Oct 6, 2015 at 9:55

Rustam

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Comments

Sajan Chandran · Accepted Answer · 2015-10-06 09:55:56Z

1

You need to have 2 loops one to loop through the actual values array then another one is the amount (number of times).

Try this

    List<String> a = new ArrayList<String>();
    String[] values = { "A", "B", "C", "D" };
    final int amount = 2;
    int incrementVariable = 0;
    for (int i = 0; i < values.length; i++){
        for(int j = 0; j< amount; j++){
            a.add(String.format("%s%04d", values[i], incrementVariable)); 
            incrementVariable +=1;
        }
    }
    System.out.println(a);
}

Output:

[A0000, A0001, B0002, B0003, C0004, C0005, D0006, D0007]

answered Oct 6, 2015 at 9:55

Sajan Chandran

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Comments

Filip · Accepted Answer · 2015-10-06 10:03:39Z

0

I like while loops better :)

String[] s = new String[10];
String[] values = {"A", "B", "C", "D"};
final int amount = 2;

for (int i = 0; i < values.length; ++i) {
    int buffer = 0;
    while(buffer <= amount) {
        int index = i * amount + buffer;
        s[index] = values[i] + String.format("%04d", index);
        buffer++;
    }
}

System.out.println(Arrays.toString(s));

[A0000, A0001, B0002, B0003, C0004, C0005, D0006, D0007, D0008, null]

answered Oct 6, 2015 at 10:03

Filip

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