Additional lessons for the level

Methods, parameters, interactions, and overloading

A method is a set of commands that performs some operation in a program. In other words, a method is a function, something that your class knows how to do. In other programming languages, methods are sometimes referred to as "functions", but "method" is the preferred term in Java. Methods and method parameters, including examples and practice, are the topic of this lesson.

10 tips for overriding the toString() method in Java

In Java, the toString method is used to provide clear, adequate, and human-readable information about objects (instances of the Object class). By providing valuable information, properly overriding the toString method can help you debug and log the behavior of your Java program. This article explains the nuances of how the toString() method works in Java.

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Java Core, level 2, lesson 6

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Abstract Pet class

The Good Neighbor Farm takes in all pets, including outcasts and runaway convicts from all over the galaxy. But the farmers never know what kind of animals the intergalactic railroad will bring them next. To avoid any misunderstanding, create an abstract Pet class for the Good Neighbor Farm.

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Java Core, level 2, lesson 6

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"Fix the code", part 1

This task is the start of a show where you'll be the star! Essentially, the main character is a skilled junior programmer who has to deal with code written by an inept coworker. In the end, the program compiles and everyone lives happily ever after.

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Java Core, level 2, lesson 6

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"Fix the code", part 2

In this episode of "Fix the code", the young, but promising, programming intern must once again must wrestle with demons and... kittens. Aren't kittens the cutest? Or are they??? You could say this to Napoleon the cat breeder (if you dare!), but we need you to fix the code so that the program compiles.

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Java Core, level 2, lesson 6

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Cows are animals too

During the intergalactic census, cows from Planet Earth weren't included in the unified animal register, because they were confused with a strikingly similar intelligent life form from Planet Mooing. Be a programmer! Correct this injustice! Make the Cow class inherit the Animal class and finish writing the Cow class's missing methods.

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Java Core, level 2, lesson 6

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Cats should not be abstract!

Cats should not be abstract! Don't take my word for it - ask Schrodinger's cat. Its chilling story will convert any skeptic. But to not be bored, cats need their forever frenemies: dogs. So we will complete a task where two non-abstract Cat and Dog classes will inherit Pet, and then we'll write methods for them.

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