Java-Code

import java.util.Scanner;


public class matrix {
	
	
	
	

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		 Scanner scanner = new Scanner(System.in);
		
		int numRow, numColumn;
		
		System.out.println("Bitte geben sie die Reihenanzahl an : ");
		numRow = scanner.nextInt();
		System.out.println("Bitte geben sie die Spaltenanzahl an : ");
		numColumn = scanner.nextInt();
		
		Matrix2D myMatrix = new Matrix2D(numRow, numColumn);
		myMatrix.fillMatrix();
		myMatrix.ouputMatrix();
		myMatrix.rotateMatrix();
		
	}

}

Java-Code

import java.util.Scanner;


public class Matrix2D {

	int numRow;					// Anzahl Zeilen
	int numColumn;				// Anzahl Spalten
	int [][] mat2D;				// unsere Matrix
	
	
	
	
	public Matrix2D(int numRow, int numColumn) {
	
		this.numRow = numRow;
		this.numColumn = numColumn;
		mat2D = new int[numRow][numColumn];
		
	}
	
	
	int [][] fillMatrix()
	{
		Scanner scanner = new Scanner(System.in);
		
		// loop over 2dimensional matrix and fill it 
		
		System.out.println("Füllen der matrix : \n");
		
		for(int i = 0; i < numRow; i++)
		{
			for(int k = 0; k < numColumn; k++)
			{
				System.out.println("Reihe : " + i + "Spalte : " + k);
				mat2D[i][k] = scanner.nextInt();
			}
		}
	
	
		return mat2D;
	
	}
	
	
	void ouputMatrix ()
	{
		System.out.println("Aktuelle Matrix : \n");
		
		// output every number of matrix 
		
		for(int i = 0; i < numRow; i++)
		{
			for(int m = 0; m < numColumn; m++)
			{
				System.out.print(mat2D[i][m] + " ");
			}
			
			System.out.println();
		}
	}
	
	void rotateMatrix()
	{
		// rotate Matrix 90 degrees to south ****
		
		int [][] matrixTmp = new int[numColumn][numRow];
		
		for(int j = 0; j < numRow; j++)
		{
			for(int h = 0; h < numColumn; h++)
			{
				matrixTmp[h][j] = mat2D[j][h];
			}
		}
		
		// ***************************************
		
		// now output the rotated Matrix 
		
		System.out.println("\nRotierte Matrix : \n");
		
		for(int j = 0; j < numColumn; j++)
		{
			for(int h = 0; h < numRow; h++)
			{
				System.out.print(matrixTmp[j][h] + " ") ;
			}
			
			System.out.println();
		
		}
		
	}
	
	
}