A program that generates “illegal start of type” and “ expected” error although the code looks OK.

What to do when you see an incompatible types compiler error in a loop condition or in the condition of an if statement.

Shows the effect of using equals (=) instead of equalsequals (==), causing an assignment when you intend to have a equality comparison.

What to do when you see an incompatible types compiler error in a loop condition or in the condition of an if statement.

Shows the effect of using equals (=) instead of equalsequals (==), causing an assignment when you intend to have a equality comparison.

Small method demonstrating syntax error caused by a missing semi-colon.

Demonstrates 3 compiler errors; “not a statement”, “cannot find symbol” and “cannot be applied.”

Demonstrates the use of .equals (dot equals) to compare objects rather than == (Equals equals). The same equality comparison that works for primitives does not work for object types.

This video demonstrates how to deal with a compiler error that does not seem to make sense. BlueJ shows a semi-colon expected error, but on a line number with a semi-colon.

The compiler generates a “non-static method X cannot be referenced from a static context” message. Shows what happens when a non-static method is called form the static main method.

The compiler reports an “unsupported exception” and that it “must be caught or declared to be thrown.”