Zeek_78_Types of Errors in Java

 

Types of Errors in Java

 Java, there are three types of error that can occur:

• 1- Syntax Errors
• 2- Logical Errors
• 3- Runtime Errors

Syntax errors

A syntax error occurs when the code given does not follow the syntax rules of the programming language. 

Examples include:

• --> Misspelling a statement, eg writing pint instead of print
• --> Using a variable before it has been declared
• --> Missing brackets, eg opening a bracket, but not closing it

A program cannot run if it has syntax errors. 

Any such errors must be fixed first. 

A good integrated development environment (IDE) usually points out any syntax errors to the programmer.

• Logical Errors

A logic error is an error in the way a program works. 

The program can run but does not do what it is expected to do.

Examples include:

• --> Incorrectly using logical operators, eg expecting a program to              stop when the value of a variable reaches 5, but using <5                   instead of     <=5.
• --> Incorrectly using Boolean operators
• --> Unintentionally creating a situation where an infinite loop may          occur
• --> Incorrectly using brackets in calculations
• --> Unintentionally using the same variable name at different points          in the program for different purposes
• --> Using incorrect program design

Unlike a syntax error, a logic error does not usually stop a program from running. 

The program will run, but not function as expected.

NOTE- A program with a syntax error will not run. 

           A program with  a logic error will run but it will not perform            as expected.

Runtime errors

A  Runtime Error is an error that takes place during the running of a program.

An example is 

Writing a program that tries to access the sixth item in an array that only contains five items.

 A runtime error is likely to crash the program.