Java

class Matrix{
public static void main(String []args){

    int ArrayMatrix [] [] = {
                 {1,0,0,0,0},
                 {0,1,0,0,0},
                 {0,0,1,0,0},
                 {0,0,0,1,0},
                 {0,0,0,0,1},

                };

    int l = ArrayMatrix.length;
    int i,j;
    boolean a=true;
    boolean b=false;

    for( i=0;i<l;i++)
    {

       for(j=0;j<l;j++)
       {
                System.out.print(ArrayMatrix[i][j]+" ");
        /*

            //if(ArrayMatrix[i][j]==1)
            if(boolean b==true)
            {
            System.out.println("Matrix is Unit");
            }

            else
            {
            System.out.println("Matrix is not Unit");
            }
        */


       }//end inner for

        System.out.println("");

    }//end outer for

    System.out.println("\n Array is Unit Matrix");
    

}//end main Method
}//end class Matrix