CODEWITHSUNDEEP
javaarrays
user2775042
user2775042

Reputation: 509

What is the easiest way to print an array on rows?

public static void main(String[] args) {
    String[] Test = new String[]{"1","2","3","4","5","6","7","8","9"};
}

I want to be able to print like this.

 1  2  3 
 4  5  6
 7  8  9

I have tried by using for loops three times to print it but i was wondering if there is an easier way to do it.

Upvotes: 0

Views: 108

Answers (4)

ROMANIA_engineer
ROMANIA_engineer

Reputation: 56714

Try:

for ( int i = 0 ; i < Test.length ; i++ ) {
    System.out.print(Test[i]+" ");
    if ( i%3 == 2 ) {
        System.out.println();
    }
}

or

for ( int i = 0 ; i < Test.length-2 ; i++ ) {
    System.out.print(Test[i]+" "+Test[i+1]+" "+Test[i+2]+"\n");
}

and change the name for Test in test.

Upvotes: 1

Qadir Hussain
Qadir Hussain

Reputation: 1263

    public static void main(String[] args) {
        String[] Test = new String[]{"1","2","3","4","5","6","7","8","9"};
        for(int i = 1; i <= Test.length; i++) {
            System.out.print(Test[i - 1]+" ");
            if(i % 3 == 0)
               System.out.println();
        }
    }

Upvotes: 1

Edwin Buck
Edwin Buck

Reputation: 70949

For perfect alignment, you need to do two passes. One to keep track of the maximum size of each to-be-printed column, and the second to print all the columns adjusted to the desired size.

This is because if you start printing the first line

1 2 3

some devious movement of the universe will eventually guarantee that the second row will contain the numbers

3425 2352342 2

and it will blow your alignment. However, if you walk the data one time, updating the maximum size of the column (if necessary)

(row 1) (column 1 max size is 1) (column 2 max size is 1) (column 3 max size is 1)
(row 2) (column 1 max size is 4) (column 2 max size is 7) (column 3 max size is 1)

then the second time you go through the data, you can print each row with the correct amount of padding (spaces for max column width - width of data, and then the value)

   1       2 3
3425 2352342 2

Now as to how to transform a one dimensional array into a two dimensional array, it depends. One could just declare a two dimensional array from the start, or you could specify the width of the row, counting off elements until a row is "filled".

Both techniques will work, and depending on circumstance, you might find that one approach fits some problems better than the other (but there's likely not a perfect solution for all problems).

Upvotes: 0

Kent
Kent

Reputation: 195229

printf could help.

This loop should do:

for (int i = 0; i < Test.length; i++) {
    System.out.printf("%s%s", Test[i], i % 3 == 2 ? "\n" : " ");
}

Upvotes: 2

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