Errors

The following program contains various errors:

public class Errors {
  public static void main(String[] args) {
    System.out.println("These are my first Java errors ...")
    Sistem.out.println("... and they will not be the last ons!!!");
  }
}

Corrected program:

public class Errors {
  public static void main(String[] args) {
    System.out.println("These are my first Java errors ...");
    System.out.println("... and they will not be the last ones!!!");
  }
}

Types of errors:

• Syntax error, which is an error caused by a violation of the syntax rules for the language
  • example: System.out.println(...) - the final ';' is missing
  • syntax errors are detected by the compiler
  

• Semantic error, which is an error caused by the impossibility to assign a meaning to a program statement
  • example: Sistem.out.println(...); - there is a spelling error in the word System
  • some of these errors are detected by the compiler (static semantic errors), some are detected only at runtime (dynamic semantic errors)
  

• Logical error, which is an error caused by the fact that the program realizes a different functionality than the expected one
  • example: System.out.println("... and they will not be the last ons!!!"); - the string to be printed is not correct
  • logical errors can be detected only by analyzing the program or by testing it