How to delete all the same data in an 2_D array java

Question

I am trying to delete all the same data in an 2D array; for example;

0 1 3 4 1 4
0 2 3 4 2 1
0 2 3 2 2 1

if the user types the coordinate as (0,1); all the data that equals to 0 should be null; However, my code will just the delete the data which I typed in.

int a =Integer.valueOf(scan.next());
int b= Integer.valueOf(scan.next());
for(int i=0;i<rows;i++){
    for (int j=0;j<clos;j++){
        if(BubbleWordl.world[i][j]==BubbleWorld.world[a][b]){
            BubbleWorld.world[i][j]=null;
        }
    }
}

world is an array of...??? – ΦXocę 웃 Пepeúpa ツ Oct 20 '16 at 18:31 — ΦXocę 웃 Пepeúpa ツ, Oct 20 '16 at 18:31

score 0 · Answer 1 · edited May 23 '17 at 11:53

0

I guess that BubbleWordl.world is an array of Integer class instances, not an array of int primitives.

Use .equals for comparing Integers:

if(BubbleWordl.world[i][j].equals(BubbleWorld.world[a][b])) {
   ...

See Java: Integer equals vs. == for details.

edited May 23 '17 at 11:53

Community

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1

answered Oct 20 '16 at 18:31

Alex Shesterov

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How to delete all the same data in an 2_D array java

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