struggling to print arrays [duplicate]

Question

so, I'm trying to print multidimensional arrays with print statements

output of row 0: 2 3 6 8 10 12 14 16,
output of row 1:4 6 8 10 12 14 16 18 
and output of row 2: 6 8 10 12 14 16 18 20

Code:

public static void main(String [] args) {

    int [][] array = {{2,4,6,8,10,12,14,16},{4,6,8,10,12,14,16,18},{6,8,10,12,14,16,18,20}};

      for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array[i].length; j++) {
                System.out.print(array[i][j] + " ");
            }
      }    
}

Unclear what problem you are having. Are you missing a System.out.println(); after the inner loop? — Andy Turner
– Andy Turner, Commented Dec 21, 2018 at 8:01
Simpler, but not with exactly the same output: Arrays.asList(array).forEach(a -> System.out.println(Arrays.toString(a))); — Anonymous
– Anonymous, Commented Dec 21, 2018 at 8:06
Please, are you stating the observed output or the output that you want in your question? Please also state the other so we can know what the difference and therefore what your issue is. — Anonymous
– Anonymous, Commented Dec 21, 2018 at 8:09
Please be more clear on what exactly are you asking for ? With the above question it becomes absolute nightmare to guess what you could probably be asking ! — qre0ct
– qre0ct, Commented Dec 21, 2018 at 9:22

ZhaoGang · Accepted Answer · 2018-12-21 08:10:13Z

3

Note that the difference between print and println:

println(String x):

Terminates the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('\n').

print(String s):

Prints a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are converted into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

So println add an addtional line separator for you compared with print

Reference:

https://docs.oracle.com/javase/7/docs/api/java/io/PrintStream.html#println()

answered Dec 21, 2018 at 8:10

ZhaoGang

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Comments

Roma · Accepted Answer · 2018-12-21 12:07:06Z

2

There are multiple ways to handle this. I suggest for-each loop to print the arrays as below:

public static void main(String[] args) {
    int[][] array = {{2, 4, 6, 8, 10, 12, 14, 16}, {4, 6, 8, 10, 12, 14, 16, 18}, {6, 8, 10, 12, 14, 16, 18, 20}};
    int i=1;
    for (int[] row : array)
    {
        System.out.println("output of row " +i +Arrays.toString(row));
        i++;
    }
}
}

edited Dec 21, 2018 at 12:07

answered Dec 21, 2018 at 9:03

Roma

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1 Comment

Roma Over a year ago

@OleV.V. Thanks for your suggestion. Really appreciate it.

Sandeepa · Accepted Answer · 2018-12-21 08:05:02Z

1

You can change your code like this and get your output

public class Main {

    public static void main(String[] args) {
        int[][] array = {{2, 4, 6, 8, 10, 12, 14, 16}, {4, 6, 8, 10, 12, 14, 16, 18}, {6, 8, 10, 12, 14, 16, 18, 20}};
        for (int i = 0; i < array.length; i++) {
            System.out.print("output of row " + i + ": ");
            for (int j = 0; j < array[i].length; j++) {
                System.out.print(array[i][j] + " ");
            }
            System.out.println();
        }

    }
}

answered Dec 21, 2018 at 8:05

Sandeepa

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2 Comments

sammy1180 Over a year ago

how can I add print statements to this code, eg. row 0 output is 2,4,6,8,10,12,14,16 and row 1 is 4,6,8,10,12,14,16,18.

Sandeepa Over a year ago

@sammy1180 Its the same code. Only difference is I have added System.out.print("output of row " + i + ": "); before your inner loop and added System.out.println(); after your inner loop

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