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javaarrays
Kingo Mostafa
Kingo Mostafa

Reputation: 347

how to iterate 2d array java

I have 2d array called myarr[3][3] and I want to to get myarr[0][0], myarr[0][1], and myarr[0][2] in another 1d array called arr1[3]. The same for myarr[1][0], myarr[1][1], and myarr[1][2] in another 1d array called arr2[3], and so on.

How can I do something like that in Java?

I have tried to use for loop but I stopped and couldn't know what to write inside it.

for(int i=0 ; i<3 ; i++){
    for(int j=0 ; j<3 ; j++){
        //what can i write here
    }
}

Upvotes: 1

Views: 227

Answers (1)

Anderson Vieira
Anderson Vieira

Reputation: 9059

Instead of using an explicit for loop, you could use System.arraycopy(). These are the method signature and description:

arraycopy(Object src, int srcPos, Object dest, int destPos, int length)

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

Then, to copy the contents from myarr[0] to arr1 you could do:

System.arraycopy(myarr[0], 0, arr1, 0, arr1.length);

Upvotes: 1

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