a+b=30

Code Understanding

class AllTokens
{
public static void main(String[] args)
{
int a=10,b=20;
int c=a+b;
System.out.println(“a+b=”+c);
}
}

The tokens in above program are marked in following colours

Red Colour = Keywords
Blue Colour = Identifiers
Magenta Colour = Literals
Green Colour = Operators
Black Colour = Separators/Punctuators

Notes

• The words like main, String etc. look like things not given by the users. They are actually given by the users in the java development team and hence they are still called identifiers and not keywords.
• Some textbooks consider white-spaces and comments also as other types of tokens.

Common Errors

• Sometimes student marks words like System.out.println also as keywords. They are clearly the identifiers which come from java library classes/packages.

Suggested Filename(s): AllTokens.java