Java Multidimensional array passing as a object

Question

Its just a OOP test I was doing, could you please help me understanding the concept of how to set the Multidimensional array value by passing the object. Please check the below code;

 public class agnts {



 private int rate[][] = new int [4][5];

 public agnts(){
 rate[0][1] = new pric(25);
 rate[1][1]=new pric(30);
 rate[2][1]= new pric(45);
 rate[3][1]=new pric(55);
 }    
 }
 class pric {
 //int pric [][]= new int [4][5];
 int pric;
public pric(int p){

    this.pric=p;
}
 public int getPric(){
    return pric;
}
}
 public static void main(String[] args) {        

  agnts tz=  new agnts();
  }

I get an error of type incompatible required:int found:pric Am I doing something wrong? please advise.

well you have an int[][] and your are trying to set its elements to your class pric. You need to do rate[X][Y]=new pric(Z).getPric();. Better yet, read this. — Boris the Spider
– Boris the Spider, Commented Apr 9, 2013 at 21:42

Elior · Accepted Answer · 2013-04-09 22:00:05Z

2

You're getting an error because of this

private int rate[][] = new int [4][5];
// You declare a multi-dimensional integer array.

public agnts(){
  // you then attempt to assign objects to that array.
  rate[0][1] = new pric(25);
  rate[1][1]=new pric(30);
  rate[2][1]= new pric(45);
  rate[3][1]=new pric(55);
}

you declared matrix of integers but you're initializing it with your pric class..

UPDATE 1: as bmorris591 suggested at is comment:

 public agnts(){
     rate[0][1] = new pric(25).getPric();
     rate[1][1]=new pric(30).getPric();
     rate[2][1]= new pric(45).getPric();
     rate[3][1]=new pric(55).getPric();
  }

UPDATE 2: if you want to set random number for the all matrix:

for (int row = 0; row < rate.length; row ++ )
 for (int col = 0; col < col[row].length; ; col ++)
    rate[row][col] = (int)(Math.Random()*10+1); // this will generate number between 1 to 10

edited Apr 9, 2013 at 22:00

answered Apr 9, 2013 at 21:43

Elior

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1 Comment

Cortez Ninja Over a year ago

can you please point me what I need to do to fix it any example would be very appreciated

JB Nizet · Accepted Answer · 2013-04-09 21:45:33Z

0

rate is an array of arrays of integers:

private int rate[][] = new int [4][5];

so rate[0][1] is an int.

So, since it's an int, assigning it an instance of pric makes no sense:

rate[0][1] = new pric(25);

You might want to initialize it to an int:

rate[0][1] = 25;

Or you might want to make rate an array of arrays of pric:

private pric[][] rate = new pric[4][5];

Note that Java conventions tell that classes should start with an uppercase letter. Choosing good names makes the code more readable also. What is a pric? What is an agnts?

answered Apr 9, 2013 at 21:45

JB Nizet

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Comments

Boris the Spider · Accepted Answer · 2013-04-09 21:46:25Z

0

You have declared an array of int

private int rate[][] = new int[4][5];

And you have class pric which contains an int.

You are trying to set members of the array to be equal to new pric(X), this is the same as

int i = new pric(X);

If you cannot see what is wrong with that then maybe start here and work your way through.

answered Apr 9, 2013 at 21:46

Boris the Spider

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Comments

Matt · Accepted Answer · 2013-04-09 21:46:30Z

0

You are calling the constructor for pric here: rate[0][1]=new pric(25);

The constructor returns an object of class pric, but you want to call getPric() on that instead: rate[0][1]=new pric(25).getPric();

answered Apr 9, 2013 at 21:46

Matt

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