hts.StevenWood.com

Common Programming Errors

1. Forgetting to invoke a Math class method by preceding the method name with the class name Math and a dot operator (.) results in a syntax error.
2. Defining a method outside the braces of a class definition is a syntax error.
3. Omitting the return-value-type in a method definition is a syntax error.
4. Forgetting to return a value from a method that is supposed to return a value is a syntax error. If a return-value type other than void is specified, the method must contain a return statement.
5. Returning a value from a method whose return type has been declared void is a syntax error.
6. Declaring method parameters of the same type as float x, y instead of float x, float y is a syntax error because types are required for each parameter in the parameter list.
7. Placing a semicolon after the right parenthesis enclosing the parameter list of a method definition is a syntax error.
8. Redefining a method parameter as a local variable in a method is a syntax error.
9. Passing to a method an argument that is not compatible with the corresponding parameter's type is a syntax error.
10. Defining a method inside another method is a syntax error.
11. Attempting to determine the length of a String via length (e.g. s1.length) is a syntax error. The String method length() must be used. (e.g. s1.length() )
12. Attempting to access a character that is outside the bounds of a String (i.e., an index less than 0 or an index greater than or equal to the String's length) results in a StringIndexOutOfBoundsException.

Source: Deitel, H.M. and Deitel P.J. Java: How to Program. 3rd ed. Upper Saddle River, New Jersey. Prentice Hall.1999. ISBN 0-13-012507-5, p 252, 505.