Titlebook: Learn Java Fundamentals; A Primer for Java De Jeff Friesen Book 2024 Jeff Friesen 2024 Java.APIs.arrays.interfaces.Java Development Kit.va

Enlightening

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STING

Comments, Identifiers, Types, Variables, and Literals,When learning a new programming language, starting with the most basic of language features is best. These features are comments, identifiers (with reserved words as a subset), types, variables, and literals. This chapter introduces you to these features in a Java context.

軍火

Expressions,Computer programs manipulate data via expressions. This chapter introduces you to expressions in terms of simple and compound expressions.

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accordance

Classes and Objects,This chapter introduces you to classes and objects. It then focuses on ten additional topics that you need to know when working with these language features.

cloture

Intervention

Changing Type via Polymorphism,Some real-world entities can change their forms. For example, water (on Earth as opposed to interstellar space) is naturally a liquid, but it changes to a solid when frozen, and it changes to a gas when heated to its boiling point. Insects such as butterflies that undergo metamorphosis are another example.

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fluffy

Packages,Same-named reference types (e.g., two different . classes) can cause name conflicts when you try to use them, but Java overcomes this problem with packages. This chapter introduces you to the package concept followed by the . and . statements. Finally, you learn about static imports, protected access, and JAR files.

虛假

Exceptions and Errors,In an ideal world, nothing bad ever happens when an application runs. For example, a file always exists when the application needs to open the file, the application is always able to connect to a remote computer, and the Java Virtual Machine (JVM) never runs out of memory when the application needs to instantiate objects.