Matrix für Dummis

[Wrigleys]

Also ich hab ein Problem mit der Ausgabe und weiß echt nicht was falsch ist.
Es zeigt mir meine Matrizen nicht wieder an, obwohl ich die davor eingegeben habe,

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Please write the matrix, Coloumn and Rows
Colomns: 
2
Rows: 
2
Creating Matrixes
Please Enter next: (0)(0)
1
Debug: setting value X2 Y2
Please Enter next: (0)(1)
1
Debug: setting value X2 Y2
Please Enter next: (1)(0)
1
Debug: setting value X2 Y2
Please Enter next: (1)(1)
1
Debug: setting value X2 Y2

[ 0.0 0.0 ]
[ 0.0 0.0 ]
null

[ 0.0 0.0 ]
[ 0.0 0.0 ]
null

[ 0.0 0.0 ]
[ 0.0 0.0 ]
null

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//import java.util.*;

class Matrix {
	static int x, y; //important, because you have to read the matrix 
	static String s;  //important, because my InteractivIO wants a STRING!	
	static double [][]matrix; //important for the matrix (2dimensions [m=rows][n=coloms])

	
	
//----------------------------------------------------------------------------------------------
	 Matrix (int m, int n)throws Exception { //create a M-by-N matrix
		x=m;
		y=n;
		matrix = new double [m][n];	
	}
	
//--------------------------------------------------------------------------------------------	
	public String toString() {
		printMatrix(matrix);
		return s;
	}
	
	public void printMatrix(double [][]matrix){
		int m = matrix.length; 	//Rows
		System.out.println();
		for(int i=0; i<m; i++){
			int n = matrix[i].length;
			System.out.print("[ ");
			
			for(int j=0; j<n; j++){
				System.out.print(matrix[i][j]+" ");
			}
			System.out.println("]");
		}
	}
//--------------------------------------------------------------------------------------------	
	
	public double setElement(int i, int j, double k)throws Exception{
		System.out.println("Debug: setting value X" + x + " Y" + y);
		return matrix[i][j] = k;
	}
	
//--------------------------------------------------------------------------------------------	
	public double getElement(int i, int j){
		return matrix[i][j];
	}
	
//---------------------------------------------------------------------------------------------	
	public void add (Matrix mat){

	}
	
//--------------------------------------------------------------------------------------------	
	public void multiply(Matrix mat){
		
	}
//--------------------------------------------------------------------------------------------
	
	public static void main (String[]args) throws Exception {
		Matrix A,B; //for the matrix
		Matrix C; //for addition result matrix
	
		InteractivIO.write("Please write the matrix, Coloumn and Rows");
		y=InteractivIO.readInt("Colomns: ");
		x=InteractivIO.readInt("Rows: ");
		System.out.println("Creating Matrixes");
		
		A= new Matrix(x,y);
		B= new Matrix(x,y);
		
		for(int i=0;i<x;i++){
			   for(int j=0;j<y; j++)
				   A.setElement(i,j,InteractivIO.readInt("Please Enter next: (" +  i + ")(" + j + ")"));
		}
		
		C= new Matrix(x,y);	
		
		InteractivIO.write(A.toString());
		InteractivIO.write(B.toString());
		InteractivIO.write(C.toString());				
	}
	
}//end

 

[matdacat]

Entferne das "static" vor den Variablen! Diese Variablen sind Eigenschaften jeder einzelnen Matrize (Instanzvariablen), keine Klassenvariablen! Momentan überschreibst Du mit dem Erzeugen der Matrizen B und C die zuvor gesetzten Werte im Array.

PS. set-Methoden haben im Normalfall keinen Rückgabewert. Ein einfaches

matrix[i][j] = k;

reicht vollkommen.