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Emoticons
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#1 alice14 ?
Reputation: 0
- Posts: 11
- Joined: 02-December 12
Posted Yesterday, 01:57 PM
I'm working on a program that requires redefining the toString method to display the values of a 2-dimensional Matrix, instead of their memory address. Then, redefine the equals method so the Matrix objects are compared correctly.Here is what I've tried so far:
import java.util.Random; public class TextLab09 { public static void main(String args[]) { System.out.println("TextLab09\n\n"); Matrix m1 = new Matrix(3,4,1234); Matrix m2 = new Matrix(3,4,1234); Matrix m3 = new Matrix(3,4,4321); System.out.println("Matrix m1\n"); System.out.println(m1+"\n\n"); System.out.println("Matrix m2\n"); System.out.println(m2+"\n\n"); System.out.println("Matrix m3\n"); System.out.println(m3+"\n\n"); if (m1.equals(m2)) System.out.println("m1 is equal to m2\n"); else System.out.println("m1 is not equal to m2\n"); if (m1.equals(m3)) System.out.println("m1 is equal to m3\n"); else System.out.println("m1 is not equal to m3\n"); } } class Matrix { private int rows; private int cols; private int mat[][]; public Matrix(int rows, int cols, int seed) { this.rows = rows; this.cols = cols; mat = new int[rows][cols]; Random rnd = new Random(seed); for (int r = 0; r < rows; r ++) for (int c = 0; c < cols; c++) { int randomInt = rnd.nextInt(90) + 10; mat[r][c] = randomInt; } } public String toString() { int randomint = Integer.parseInt(randomInt); return "[" + mat + "]"; } public boolean equals (Matrix that) { return this.rows ==(that.rows) && this.cols == that.cols; } }
I'm not sure as to what part of the matrix method I need to convert to an int value, or if I should use valueOf instead of parseInt?
Thanks!
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Replies To: Using string methods with Matrix
#2 g00se ? 
Reputation: 2026
- Posts: 8,451
- Joined: 20-September 08
Re: Using string methods with Matrix
Posted Yesterday, 02:08 PM
Your easiest (but not necessarily finest) option for toString would be to use java.util.Arrays.deepToStringequals could be done using java.util.Arrays.equal on each row
This post has been edited by g00se: Yesterday, 02:09 PM
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Source: http://www.dreamincode.net/forums/topic/318258-using-string-methods-with-matrix/
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