Errors

• Compile-time errors
  • Easy to detect and fix
• Run-time errors
  • Tricky
  • Use debugger

IntelliJ Debugging

• Break points suspend thread execution

  • Java will execute up to the break point

  • The line will not be executed

• Click Step Over to execute the code line by line
• Click Step In to go inside the calling method
• Variables' value are shown in the Variables panel
  • Click Add to add new variables to watch their value changes
• Methods are listed in the Frames (or Call Stack ) panel in reverse order