Download Java Programming for Kids, Parents and Grandparents by Yakov Fain PDF

By Yakov Fain

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Example text

This time we’ll create a new class called ReportCard. This class has to have the method main() and also a method that will have one argument - numeric test result. Depending on the number, it should print your grade like A, B, C, D, or F. We’ll name this method convertGrades(). public class ReportCard { /** This method takes one integer argument - the result of the test and returns one letter A, B, C or D depending on the argument. */ Java Programming for Kids, Parents and Grandparents 45 Beside using the else if condition, this example also shows you how to use variables of type char.

If you do not create a constructor for the class, Java automatically creates during the compilation time so-called default no-argument constructor. That’s why Java compiler has never complained about such statement as new Fish(), even though the class Fish did not have any constructors. In general, constructors are used to assign initial values to member variables of the class, for example the next version of class Fish has one-argument constructor that just assigns the argument’s value to the instance variable currentDepth for future use.

They do not return a value, and you do not even have to use the keyword void in constructor’s signature. • • • Any class can have more than one constructor. If you do not create a constructor for the class, Java automatically creates during the compilation time so-called default no-argument constructor. That’s why Java compiler has never complained about such statement as new Fish(), even though the class Fish did not have any constructors. In general, constructors are used to assign initial values to member variables of the class, for example the next version of class Fish has one-argument constructor that just assigns the argument’s value to the instance variable currentDepth for future use.

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