To Documents

Debugging Checklist

Data Declaration and Initialization

• Any undeclared variables?

• Any improperly uninitialized variables?

• Default variable values understood?

• Variables of correct datatype?

• Correct size of integer variable used (byte, short, int or long)?

• Any variables with similar names confused?

Computation

• String subscripts within bounds?

• Any non-integer string subscripts?

• Off-by-one errors in indexing or subscripting operations?

• Computations on nonarithmetic variables?

• Mixed-mode computations?

• Computations on variables of diffent lengths?

• Intermediate result overflow or underflow?

• Division by zero?

• Floating point inaccuracies?

• Operator precedence understood?

• Integer divisions correct?

Comparisons

• Comparison relationships correct?

• Is = used instead of ==?

• Floating point comparisons correct?

• Boolean expressions correct?

• Improper comparisons of floating point values

• Operator precedence understood?

Control Flow

• Are all cases covered in if or switch statements

• Should there be a default case in if or switch statement?

• Are break statements omitted in switch statement?

• Is if statement used when if..else should be used or vice versa?

• Will each loop terminate?

• Will program terminate?

• Any loop bypasses because of entry conditions?

• Are possible loop fall-throughs correct?

• Any off-by-one iteration errors?

• Are { and } correctly placed?

• Any misplaced semicolons, for example
  for(i = 0; i <= 100; i++);
      System.out.println(i);

Method Calls

• Are all method names spelled correctly?

• Are all method names capitalized correctly?

• Is the number of arguments correct?

• Are the types of the arguments correct?

• Is the order of the arguments correct?

• Is the package containing the method imported correctly?

Input/Output

• Are Scanner objects calls correct?

• Is System.out.print used when System.out.println is appropriate or vice versa?

• Is format string correct in System.out.printf?

• Input checked for validity?

• Any textual or grammatical errors in output?

Other Checks

• Any warning messages?

• Are import statements correct?