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Thread: type mismatch problem

  1. #1
    Junior Member
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    Oct 2013
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    Default type mismatch problem

    Here is a problem im working on for my intro to java class:
    1.Design a class named Location for locating a maximal value and its location in a twodimensional
    array. The class contains:
    2.Private data fields row and column that store the indices it a two dimensional
    array as int type.
    3.A no-arg constructor that creates a location with default values.
    4.A constructor with the arguments for row and column.
    5.The method named locateLargest(double [][] x) that returns the location of the
    largest element in a two-dimensional array. The return value is an instance of
    Location. This method should also print the largest value of the array.
    The method is: public Location locateLargest(double [][] x) {}
    6.A toString() method that prints a Location object in the form [row][column].

    My code:
    package classAssignment;
    import java.util.Scanner;
    public class Location {
    	private int row;
    	private int column;
    	private int[][] array = new int[row][column];
    	public static void main(String[] args) {
    		Scanner numberInput = new Scanner(System.in);
    		System.out.println("Enter the number of rows and columns of the array: ");
    		int row = numberInput.nextInt();
    		int column = numberInput.nextInt();
    		Location l1 = new Location(row, column);
    	}//end main
    	Location(){}//end constructor
    	Location(int row, int column){
    		this.row = row;
    		this.column = column;
    	}//end arg constructor
    	public Location locateLargest(double[][] x){
    		double max = 0;
    		for (int i = 0; i < x.length; i++){
    			for (int j = 0; j < x.length; i ++){
    				if (x[i][j] > max)
    					max = x[i][j];
    		return x;
    	}//end locateLargest()
    	public int getRow(){
    		return this.row;
    	}//end getRow()
    	public int getColumn(){
    		return this.column;
    	}//end getColumn()
    }//end class

    My problem is in the locateLargest method. I can't return the max because it is of type location and I have no idea how to convert it into a double. I've even tried declaring the array in multiple other places like in another class or in the locateLargest method itself but those ideas didn't work either. Any help would be appreciated.

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,273 Times in 2,244 Posts

    Default Re: type mismatch problem

    can't return the max because it is of type location and I have no idea how to convert it into a double.
    Use the new statement to create an instance of the Location class with the row and column where the largest was found. Then return it.
    If you don't understand my answer, don't ignore it, ask a question.

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