How can I define such an array?

Question

I need to make an array in JAVA like the one below:

Array(
    [0]=> Array(
            [0]=>1
            [1]=>1
            [2]=>1
            )
    [1]=> Array(
            [0]=>4
            [1]=>7
            [2]=>10
            )
     )

And how do I read this array using JAVA?

The PHP equivalent of this would be:

$a=array( array( 1, 1, 1 ), array( 4, 7, 10 ) );

And I can read it like this in PHP:

foreach( $a as $v ){
echo $v[0]. " ". $v[1]." ". $v[2]. "\r\n";
}

To sum up, I want to define an INT array of size 2, and each element of this array is another array of size 3. Then I want to read the inside array 3 values during a loop in three different INT variables. How can I do this?

Peter Lawrey · Accepted Answer · 2016-07-02 06:38:11Z

3

You can use { } to define arrays

int[][] values = {{ 1, 1, 1 }, { 4, 7, 10 }};

To print them in a loop like you do

for (int[] a : values) 
    System.out.println(a[0] + " " + a[1] + " " + a[2]);

I suggest you read up on how arrays work in Java.

https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

answered Jul 2, 2016 at 6:38

Peter Lawrey

535k83 gold badges770 silver badges1.2k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Andrew · Accepted Answer · 2016-07-02 06:56:05Z

2

You need to declare a two-dimensional array. The standard way to do this:

int[][] array = new int[][]{
    new int[] {1, 2, 3},
    new int[] {4, 5, 6}
};

But you could use more convenient one.

int[][] array = { {1, 2, 3}, {4, 5, 6} };

To iterate over the array you may use:

for(int[] i : array) {
    for(int j : i) System.out.print(i + " ");
    System.out.println();
}

edited Jul 2, 2016 at 6:56

answered Jul 2, 2016 at 6:39

Andrew

49.8k15 gold badges99 silver badges145 bronze badges

1 Comment

Sumit Kumar Over a year ago

Thank you both for the answers. This solves my problem :)

Collectives™ on Stack Overflow

How can I define such an array?

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related