原创 Chapter 20 The I/O Package
1) The java.io package defines I/O in terms of streams, while the java.nio package defines I/O in terms of buffers and c
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原创 Chapter 15 Annotations
1) Annoation /?n??te???n/ types present the information in a standard and structured way that is amenable to automated
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原创 Chapter 14 Threads
1) You can create a thread like the following statement: Thread worker = new Thread(); A thread is a thread of execution
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原创 Chapter 18 Packages
1) Packages define units of software that can be distributed independently and combined with other packages to form appl
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原创 Chapter 17 Garbage Collection and Memory
1) The Java virtual machine uses a technique known as garbage collection to determine when an object is no longer refere
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原创 Chapter 8 Primitives as Types
1) The primitive types and their corresponding Wrapper classes’ hierarchy: 2) Given that the wrapper classes are immu
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原创 Chapter 3 Extending Classes
1) The collection of methods and fields that are accessible from outside a class, together with the description of how t
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原创 Chapter 4 Interfaces
1) An interface can declare three kinds of members: constants(fields) methods nested classes and interfaces All inte
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原创 Chapter 12 Exceptions and Assertions
1) All exception types must extend the class Throwable or one of its subclass. There’re two kinds of exceptions in Java:
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原创 Chapter 10 Control Flow
1) A switch statement allows you to transfer control to a labeled entry point in a block of statements, based on the val
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原创 Chapter 13 Strings and Regular Expressions
1) String objects are immutable(read-only), and you have a StringBuilder class for mutable strings. More generally, the
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原创 Chapter 5 Nested Classes and Interfaces
Classes’ fields are default to be protected, and the modifier is omitted implicitly. 1) A nested type is considered a pa
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原创 Chapter 7 Tokens, Values, and Variables
1) The tokenizer is a greedy tokenizer. It grabs as many characters as it can to build up the next token, not caring if
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原创 Chapter 6 Enumeration Types
1) In Java, an enum is a special kind of class, with an instance that reprsents each value of the enum. Example: enum Ca
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