Enlightening
发表于 2025-3-21 16:21:10
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STING
发表于 2025-3-21 21:42:26
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.
军火
发表于 2025-3-22 01:12:59
Expressions,Computer programs manipulate data via expressions. This chapter introduces you to expressions in terms of simple and compound expressions.
granite
发表于 2025-3-22 08:20:56
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accordance
发表于 2025-3-22 10:34:06
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
发表于 2025-3-22 15:06:18
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Intervention
发表于 2025-3-22 17:22:27
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.
milligram
发表于 2025-3-23 00:39:12
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fluffy
发表于 2025-3-23 04:25:02
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.
虚假
发表于 2025-3-23 05:53:19
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.