The document discusses common errors that can occur when writing Java code. It provides examples of code with errors like missing semicolons, non-static main methods, incorrect method signatures, and missing brackets. Each error is demonstrated, and the correct code is also shown to explain how to fix the issue.

1. First Java Errors
Hello? No Whirl?

2. class Main {
public static void main(String[] args) {
System.out.println("Howdy, world!")
}
}
javac -classpath
.:/run_dir/junit-4.12.jar:target/dependency/*
-d . Main.java
Main.java:1: error: reached
end of file while parsing
z
^
1 error
compiler exit status 1
What went wrong?

3. class Main {
public static void main(String[] args) {
System.out.println("Howdy, world!”);
}
}
Missing semicolon
the program continued
to the end of file
looking for the semicolon

4. What could go wrong?
class Main {
static void main(String[] args) {
System.out.println("Howdy, world!”); }
}
java -classpath .:/run_dir/junit-4.12.jar:target/dependency/
* Main
Error: Main method not found in class Main, please define the
main method as:
public static void main(String[] args)
or a JavaFX application class must extend
javafx.application.Application
exit status 1

5. Forgot Public
main method must be accessible
class Main {
public static void main(String[] args) {
System.out.println("Howdy, world!”); }
}

6. class Main {
public static void main(String[] vars) {
}
}
Whats wrong here?

7. class Main {
public static void main(String[] vars) {
// empty but that compiles
}
}
Nothing
args (or vars) are dummy names
can be any legal name

8. class Main {
public void main(String[] args) {
System.out.println("Howdy, world!")
}
}
What went wrong?

9. class Main {
public static void main(String[] args) {
System.out.println("Howdy, world!")
}
}
The starting method main
must be static
(so it is there from the start)

10. But, if you get it all correct…
will it fetch the bone!!!
or is something wrong?
YES OK sq brackets[ ] required for string array
Curly brackets in correct place and matching
match
match

11. It will !!

12. Basic Java Errors
Hello? No Whirl?
#&!fin’