Java - Error Log

Syntax

Error: This method must return a result of type char

An accessor method (pop()) which returns a char, generates an error when compiled.

The method must return something, in any instance it runs. In pop(), it would only return a char if an IF part of an IF-ELSE statement was executed. The solution was to modify the ELSE statement to also return a char, so regardless if the IF or the ELSE statement was executed or not, the method would still return a char.

04/10/2011

Logic

Error: java.lang.NumberFormatException: For input string: "i"

A main method which reads lines from a file and outputs integers, generates an error when ran.

The error was caused by trying to parse something into a memory type which it could not be stored in. In this particular case, a string "i" was being parsed into an integer, due to an error in the algorithm. The solution was to adjust the algorithm accordingly to avoid any possibility of parsing something into an incorrect memory type.

20/10/2011

Logic

Error: java.lang.NullPointerException

A main method which reads lines from a file and outputs integers, generates an error when ran.

The error was caused by trying to assign the string value 'null' to a StringTokenizer, which it cannot take. Like the above error, it is a logic/algorithm problem. The solution was to adjust the algorithm so there would never occur a situation where 'null' would be assigned to a StringTokenizer.

20/10/2011

Syntax

Error: Syntax error, insert ";" to complete LocalVariableDeclarationStatement

A statement where a variable was being declared was not denoted as finished by a semicolon.

Add a semicolon at the end of the statement to let the compiler understand that the variable declartion statement is complete.

25/10/2011

Syntax

Error: TEXT_FILE_OUTPUT cannot be resolved to a variable

While attempting to create a PrintWriter object, the compiler could not find the parameter given: 'TEXT_FILE_OUTPUT'

Caused by copying code from another class which had different variable names. The solution was to change the name of the parameter so it could be found.

06/11/0211

Error Type	Compiler Error (If applicable)	Description of Problem	Solution	Date
Syntax	Error: This method must return a result of type char	An accessor method (pop()) which returns a char, generates an error when compiled.	The method must return something, in any instance it runs. In pop(), it would only return a char if an IF part of an IF-ELSE statement was executed. The solution was to modify the ELSE statement to also return a char, so regardless if the IF or the ELSE statement was executed or not, the method would still return a char.	04/10/2011
Logic	Error: java.lang.NumberFormatException: For input string: "i"	A main method which reads lines from a file and outputs integers, generates an error when ran.	The error was caused by trying to parse something into a memory type which it could not be stored in. In this particular case, a string "i" was being parsed into an integer, due to an error in the algorithm. The solution was to adjust the algorithm accordingly to avoid any possibility of parsing something into an incorrect memory type.	20/10/2011
Logic	Error: java.lang.NullPointerException	A main method which reads lines from a file and outputs integers, generates an error when ran.	The error was caused by trying to assign the string value 'null' to a StringTokenizer, which it cannot take. Like the above error, it is a logic/algorithm problem. The solution was to adjust the algorithm so there would never occur a situation where 'null' would be assigned to a StringTokenizer.	20/10/2011
Syntax	Error: Syntax error, insert ";" to complete LocalVariableDeclarationStatement	A statement where a variable was being declared was not denoted as finished by a semicolon.	Add a semicolon at the end of the statement to let the compiler understand that the variable declartion statement is complete.	25/10/2011
Syntax	Error: TEXT_FILE_OUTPUT cannot be resolved to a variable	While attempting to create a PrintWriter object, the compiler could not find the parameter given: 'TEXT_FILE_OUTPUT'	Caused by copying code from another class which had different variable names. The solution was to change the name of the parameter so it could be found.	06/11/0211