Run Time Errors vs. Compile Time Errors

• Compile time errors occur when a program is being compiled (translated) into the machine's language
• Run time errors occur when a program is running

Common Compile Time Errors

• Omitting semi-colon or braces
• using undeclared identifiers
• having parameters that don't match
• assigning a variable a type that doesn't match (String s = 5)

Common Run Time Errors

• diving by zero
• using an array index that is out of bounds
• entering data that doesn't match what is expected
  int n = in.getInt(); (and you type in Joe)