SWT301_SE1955-JV

Defect ID: DF005

Defect Name: Missing null/empty checks for input matrices

Line Number: 3

Defect Description: The code accesses A[0] and B[0] without checking whether A or B is null or has zero rows, which can cause NullPointerException or IndexOutOfBoundsException.

Fixing Solution: Add checks at the start of multiplyMatrices: if A==null || B==null || A.length==0 || B.length==0 then throw IllegalArgumentException with a clear message.