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Comparing two dimensional array to one dimensional array in Java

Does anyone know why this won't compile?

public class ArrayCompare{

   public static void main (String []args){

      String words= "Hello this is a test";

      String delimiter=" ";
      String [] blocker=words.split(delimiter);

      String [][] grid= new String [100][100];

      grid[0]="Hello";

           if (grid[0].equals(blocker[0])){
                 System.out.print("Done!");
   }
        }
             }

I would like to perform this comparison function using a 2 dimensional array. I am newbie! Please help if you can. Thanks in advance!

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6 answers


Try the following:

grid[0][0]="Hello";


grid

- two-dimensional array. For the same reason, you need to do the following:

if (grid[0][0].equals(blocker[0]))
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It won't compile because grid [0] is not a string type. It is of type String [] (Array). The variable grid[0]

actually points to an array String[100]

.

You are trying to assign the string "Hello" to an array with

grid[0]="Hello";

...



If you want to assign a string to a location in grid

, you must specify two indices (the following): the following:

grid[0][0]="Hello";

May I suggest using eclipse or BlueJ to modify Java code? so that such basic errors are displayed in real time and well explained?

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grid[0]

is a type String[]

, not String

. So your code should look like this

grid[0] = new String[100];
grid[0][0] = "Hello";
if (grid[0][0].equals(bloker[0])) {
    //your logic...
}
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String [][] grid= new String [100][100];

  grid[0]="Hello";

There is your problem. You are trying to assign a string to an array of strings. Think of a 2d array as an array of arrays.

You probably want something like

grid[0][0]="Hello!";
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grid is a 2d array. you cannot do like d [0] = "hello". So if you want to assign a value at position 0

d[0][0] = "Hello";

 if (grid[0][0].equals(blocker[0])){
System.out.print("Done!");
 }
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First, you cannot assign a value to an element of a multidimensional array using a single index

grids [0] = "Hello";
you need to specify both indices like grid [0] [0] = "Hello" this will set the 0th element of the 0th row to Hello

Likewise, at compile time if (grid [0] .equals (blocker [0])) {System.out.print ("Done!"); you must pass the same indices here (you cannot compare String to Array object) if (grid [0] [0] .equals (blocker [0])) {System.out.print ("Done!");

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