Ordenar Matrices (Números ascendentes)

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package itfkdup;

/**
 *
 * @author Usuariomaq23
 */
public class Itfkdup {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int M[][] = {{7,6,15,4,3,2,1},{6,7,5,4,3,20,1},{1,6,7,40,3,2,1},{4,6,5,7,3,2,1},{1,6,5,4,3,2,7}};
        int x, y;
        int MU2[];

        for(x=0; x<M.length; x++)
        {
            MU2 = ordenar(x,M);

            for(y=0; y<MU2.length; y++)
            {
                System.out.print(MU2[y] + " ");
            }
            System.out.println();
        }
    }
    public static int[] ordenar(int x, int M[][])
    {
        int MU[];
        int y;
        for(y=0; y<M[x].length; y++)
        {
        }

        MU = new int[y];

        for(y=0; y<M[x].length; y++)
        {
            MU[y] = M[x][y];
        }

        int c, i=1, pos, t;
        c=MU.length;
        while(i>0)
        {
            i=0;
            c=c-1;
            pos=0;

            while(pos<c)
            {
                if(MU[pos]>MU[pos+1])
                {
                    t=MU[pos];
                    MU[pos] = MU[pos+1];
                    MU[pos+1] = t;
                    i++;
                }
                pos++;
            }
        }
        /*for(x=0; x<MU.length; x++)
        {
            System.out.println(MU[x]);
        }*/
        return MU;
    }

}