Arrays

[Sylph]

how is the arrays equals method supposed to work?

int[][] array1 = new int[4][2];
for (int i = 0; i < 4; i++){
     array1[0] = i;
     array1[1] = 0;
}
int[][] array2 = new int[4][2];
array2 = array1;
array2[0][0] = 991;
System.out.println(Arrays.equals(array1[0], array2[0]));

when i print this, it prints true. what's wrong?

[Yingster]

cuz u set array2=array1

[Sylph]

//how come this doesn't work?

int[][] array1 = new int[4][2];
int[][] array2 = new int[4][2];

array1[3][0] = 2;
array1[3][1] = 7;
array2[3][0] = 2;
array2[3][1] = 7;
     
System.out.println(array1[3][0]);
System.out.println(array1[3][1]);
System.out.println(array2[3][0]);
System.out.println(array2[3][1]);
           
System.out.println(array1[3].equals(array2[3]));

//this prints false

[Yingster]

u either compare an element in the array or the entire array, i dont think u can compare a row in the array

[Majin_Blues]

it depends on your equals method... (inside, did you use "==" for the entire row?  if you did, see below)

from your code it seems that each row is pointing to a different area in memory... though the values inside may be equal, they're still pointing to different sections of the memory, which is why it's false