By Robert Liguori, Patricia Liguori

If you happen to want speedy solutions for constructing or debugging Java courses, this pocket consultant presents a convenient connection with average gains of the Java programming language and its platform. You’ll locate necessary programming examples, tables, figures, and lists, in addition to Java eight positive aspects similar to Lambda Expressions and the Date and Time API. It’s a fantastic significant other, even if you’re within the workplace, within the lab, or at the road.

This publication additionally offers fabric that will help you arrange for the Oracle qualified affiliate Java Programmer exam.

-Quickly locate Java language information, equivalent to naming conventions, varieties, statements and blocks, and object-oriented programming
-Get info at the Java SE platform, together with improvement fundamentals, reminiscence administration, concurrency, and generics
-Browse via info on simple input/output, NIO 2.0, the Java collections framework, and the Java Scripting API
-Get supplemental references to fluent APIs, third-party instruments, and fundamentals of the Unified Modeling Language (UML)

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Extra resources for Java 8 Pocket Guide

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Those declared at the class level) have a default value of null. null references nothing. , those declared within a method) do not have a default value, not even a value of null. Always initialize local variables because they are not given a default value. Checking an 32 | Chapter 4: Reference Types uninitialized local variable object for a value (including a value of null) will result in a compile-time error. Although object references with a value of null do not refer to any object on the heap, objects set to null can be referenced in code without receiving compile-time or runtime errors: Date dateOfParty = null; // This will compile if (dateOfParty == null) { ...

For more information, refer back to Chapter 3. Passing Reference Types into Methods When an object is passed into a method as a variable: Converting Between Primitives and Reference Types | 35 • A copy of the reference variable is passed, not the actual object. • The caller and the called methods have identical copies of the reference. • The caller will also see any changes the called method makes to the object. Passing a copy of the object to the called method will prevent it from making changes to the original object.

Strings, primitive values, and objects intentionally made immut‐ 43 able) is another way to protect the data members from being al‐ tered by other objects. Class Syntax A class has a class signature, optional constructors, data mem‐ bers, and methods: [javaModifiers] class className [extends someSuperClass] [implements someInterfaces separated by commas] { // Data member(s) // Constructor(s) // Method(s) } Instantiating a Class (Creating an Object) An object is an instance of a class. } Separate objects of class Candidate are created (instantiated) us‐ ing the keyword new: Candidate candidate1 = new Candidate(); Candidate candidate2 = new Candidate(); Data Members and Methods Data members, also known as fields, hold data about a class.

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