cant understand why my toString method wont work... public class Matrix { private int[][] matrix; /**...
cant understand why my toString method wont work... public class Matrix { private int[][] matrix; /** * default constructor -- * Creates an matrix that has 2 rows and 2 columns */ public Matrix(int [][] m) { boolean valid = true; for(int r = 1; r < m.length && valid; r++) { if(m[r].length != m[0].length) valid = false; } if(valid) matrix = m; else matrix = null; } public String toString() { String output = "[ "; for (int i = 0; i < matrix.length; i++) { output += matrix[i]; if (i != matrix.length - 1) { output += ", "; } } return output + " ]"; } public Matrix add(Matrix om) { Matrix newMatrix = null; if(om.matrix[0].length == this.matrix[0].length) { newMatrix = new Matrix(new int[matrix.length][matrix.length]); for (int i = 0; i < om.matrix[0].length; i++) for (int j = 0; j < om.matrix[0].length; j++) newMatrix.matrix[i][j] = om.matrix[i][j] + this.matrix[i][j]; } return newMatrix; } public Matrix sub(Matrix om) { { Matrix newMatrix = null; if(om.matrix[0].length == this.matrix[0].length) { newMatrix.matrix = new int[matrix.length][matrix.length]; for (int i = 0; i < om.matrix[0].length; i++) for (int j = 0; j < om.matrix[0].length; j++) newMatrix.matrix[i][j] = om.matrix[i][j] - this.matrix[i][j]; } return newMatrix; } } public Matrix multi(Matrix om) { return null; } public Matrix scalar(Matrix om) { return null; } public boolean equal(Matrix om) { return false; } public Matrix transpose(Matrix om) { return null; } class Dimension{ private int row, column; public Dimension(int[][] a){ row = a.length; column = a[0].length; } public int getRow() { return row; } public int getColumn() { return column; } public boolean equals(Dimension d) { return d.row == this.row && d.column == this.column; } } in App class public class Lab1App { public static void main(String[] args) { Matrix a = new Matrix(new int [][] {{1,2},{5,3}}); Matrix b = new Matrix(new int [][] {{3,2},{4,5}}); System.out.println(a.add(b)); } }
Homework Answers
Matrix.java
public class Matrix {
private int[][] matrix;
/**
* * default constructor -- * Creates an matrix that has 2 rows and 2
* columns
*/
public Matrix(int[][] m) {
boolean valid = true;
for (int r = 1; r < m.length && valid; r++) {
if (m[r].length != m[0].length)
valid = false;
}
if (valid)
matrix = m;
else
matrix = null;
}
public String toString() {
String output = "[ ";
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix.length; j++) {
output += matrix[i][j];
if(i==matrix.length-1 && j==matrix.length-1)
continue;
output += " , ";
}
}
return output + " ]";
}
public Matrix add(Matrix om)
{
Matrix newMatrix = null;
if (om.matrix[0].length == this.matrix[0].length) {
newMatrix = new Matrix(new int[matrix.length][matrix.length]);
for (int i = 0; i < om.matrix[0].length; i++)
for (int j = 0; j < om.matrix[0].length; j++)
newMatrix.matrix[i][j] = om.matrix[i][j] + this.matrix[i][j];
}
return newMatrix;
}
public Matrix sub(Matrix om) {
{
Matrix newMatrix = null;
if (om.matrix[0].length == this.matrix[0].length) {
newMatrix.matrix = new int[matrix.length][matrix.length];
for (int i = 0; i < om.matrix[0].length; i++)
for (int j = 0; j < om.matrix[0].length; j++)
newMatrix.matrix[i][j] = om.matrix[i][j] - this.matrix[i][j];
}
return newMatrix;
}
}
public Matrix multi(Matrix om) {
return null;
}
public Matrix scalar(Matrix om) {
return null;
}
public boolean equal(Matrix om) {
return false;
}
public Matrix transpose(Matrix om) {
return null;
}
class Dimension {
private int row, column;
public Dimension(int[][] a) {
row = a.length;
column = a[0].length;
}
public int getRow() {
return row;
}
public int getColumn() {
return column;
}
public boolean equals(Dimension d) {
return d.row == this.row && d.column == this.column;
}
}
}
============================================================
public class Lab1App
{
public static void main(String[] args) {
Matrix a = new Matrix(new int[][] { { 1, 2 }, { 5, 3 } });
Matrix b = new Matrix(new int[][] { { 3, 2 }, { 4, 5 } });
System.out.println(a.add(b));
}
}
===========================================================
See Output : I have corrected toString method
![1 2 public class Lab1App <terminated> Lab1App [Java A C4, 4 ,9,8 ] public static void main(StringC] args)t Matrix a -new Matr](http://img.homeworklib.com/questions/4d426d90-cc7e-11ea-bd2e-dbd953c0ec4f.png?x-oss-process=image/resize,w_560)
Thanks, let me know if there is any concerns
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