Pass data from an array into a new array

just a plain copy/paste?

this would do that, assuming that both arrays are with a properly initial size.

for(int i = 0; i < arr.length; i++)

for(int j = 0; j < arr[i].length; j++)

lk[i][j] = arr[i][j];

Ruly-o_Oa at 2007-7-12 1:27:48 >

Use the java.util.Arrays class. It has a copyOf method that works pretty well.

Here is an example using a 2d array of ints.

import java.util.Arrays;

class TestArrayCopy

{

static int [][] a1 = { {1,2,3,4}, {2,4,6,8}, {3,6,9,12}, {4,8,12,16} };

public static void printTwoDArray(int [][] a)

{

for (int i = 0; i < a.length; i++)

{

for (int j = 0; j < a[0].length; j++)

{

System.out.print(a[i][j] + ((j==a[0].length-1)?"":", "));

}

System.out.println("");

}

}

public static void main(String [] args)

{

System.out.println("Original array");

printTwoDArray(a1);

int [][] b = Arrays.copyOf(a1, a1.length);

System.out.println("\nCopy of array");

printTwoDArray(b);

}

}

Here is one that uses a generic print method.

import java.util.Arrays;

class TestArrayCopy

{

static Integer [][] a1 = { {1,2,3,4}, {2,4,6,8}, {3,6,9,12}, {4,8,12,16} };

public static <T> void printTwoDArray(T [][] a)

{

for (int i = 0; i < a.length; i++)

{

for (int j = 0; j < a[0].length; j++)

{

System.out.print(a[i][j] + ((j==a[0].length-1)?"":", "));

}

System.out.println("");

}

}

public static void main(String [] args)

{

System.out.println("Original array");

printTwoDArray(a1);

Integer [][] b = Arrays.copyOf(a1, a1.length);

System.out.println("\nCopy of array");

printTwoDArray(b);

}

}

rfencla at 2007-7-12 1:27:48 >