Java Quick Syntax Reference by Mikael Olsson

By Mikael Olsson

The Java speedy Syntax Reference is a condensed code and syntax connection with the Java programming language. It provides the basic Java syntax in a well-organized layout that may be used as a convenient reference.

You won’t locate any technical jargon, bloated samples, drawn out historical past classes or witty tales during this publication. What you'll find is a language reference that's concise, to the purpose and hugely available. The e-book is full of invaluable info and is a must have for any Java programmer.

In the Java speedy Syntax Reference, you'll find:
* A concise connection with the Java language syntax
* brief, uncomplicated and centred code examples
* A good laid out desk of contents and a finished index permitting effortless assessment

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Extra resources for Java Quick Syntax Reference

Example text

By convention, the implements clause is placed after the extends clause, if the class has one. Note that although a class can only inherit from one superclass it may implement any number of interfaces, by specifying them in a comma separated list. class Circle implements Comparable { public int r; } Because Circle implements Comparable it must define the compare method. For this class the method will return the difference between the circle radiuses. The implemented method must be public, in addition to having the same signature as the method defined in the interface.

Abstract class Shape { public int x = 100, y = 100; public abstract int getArea(); } Abstract class example If a class called Rectangle inherits from the abstract class Shape, Rectangle is then forced to override the abstract getArea method. The only exception is if Rectangle is also declared abstract, in which case it does not have to implement any abstract methods. class Rectangle extends Shape { @Override public int getArea() { return x * y; } } An abstract class cannot be instantiated, but it can be used to hold instances of its subclasses.

A method that throws a checked exception, for example IOException, will not compile unless it is specified by using a throws clause after the method’s parameter list and the calling method catches the exception. Unchecked exceptions on the other hand, such as the ArithmeticException, do not have to be caught or specified. Note that to specify multiple exceptions the exception types are separated by a comma. *; // ... static void MakeException() throws IOException, ArithmeticException { throw new IOException("My IO exception"); // ...

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