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Get started with method references in Java

發佈日期: 2019-11-13，作者: Jeff Friesen

Along with lambdas, Java SE 8 brought method references to the Java language. This tutorial offers a brief overview of method references in Java, then gets you started using them with Java code examples. By the end of the tutorial you will know how … 閱讀全文 →

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Get started with lambda expressions

發佈日期: 2019-11-08，作者: Jeff Friesen

Before Java SE 8, anonymous classes were typically used to pass functionality to a method. This practice obfuscated source code, making it harder to understand. Java 8 eliminated this problem by introducing lambdas. This tutorial first introduces the lambda language feature, then provides a more detailed introduction to functional programming with lambda expressions along with target types. You’ll also learn how lambdas interact with scopes, local variables, the this and super keywords, and Java exceptions.

Note that code examples in this tutorial are compatible with JDK 12.

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Get started with lambda expressions in Java

發佈日期: 2019-11-08，作者: Jeff Friesen

Exceptions in Java, Part 2: Advanced features and types

發佈日期: 2019-09-06，作者: Jeff Friesen

JDK 1.0 introduced a framework of language features and library types for dealing with exceptions, which are divergences from expected program behavior. The first half of this tutorial covered Java’s basic exception handling capabilities. This secon… 閱讀全文 →

Exceptions in Java, Part 1: Exception handling basics

發佈日期: 2019-08-30，作者: Jeff Friesen

Java exceptions are library types and language features used to represent and deal with program failure. If you’ve wanted to understand how failure is represented in source code, you’ve come to the right place. In addition to an overview of Java exc… 閱讀全文 →

Interfaces in Java

發佈日期: 2019-07-16，作者: Jeff Friesen

Java interfaces are different from classes, and it’s important to know how to use their special properties in your Java programs. This tutorial introduces the difference between classes and interfaces, then guides you through examples demonstrating … 閱讀全文 →

Class and object initialization in Java

發佈日期: 2019-07-10，作者: Jeff Friesen

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded and that objects are initialized via constructors, but there is more to initi… 閱讀全文 →

Java 101: Java polymorphism and its types

發佈日期: 2019-05-31，作者: Jeff Friesen

Polymorphism refers to the ability of some entities to occur in different forms. It is popularly represented by the butterfly, which morphs from larva to pupa to imago. Polymorphism also exists in programming languages, as a modeling technique that … 閱讀全文 →

Java polymorphism and its types

發佈日期: 2019-05-31，作者: Jeff Friesen

Inheritance in Java, Part 2: Object and its methods

發佈日期: 2019-05-08，作者: Jeff Friesen

Java provides a standard class library consisting of thousands of classes and other reference types. Despite the disparity in their capabilities, these types form one massive inheritance hierarchy by directly or indirectly extending the Object class. This is also true for any classes and other reference types that you create.

The first half of this tutorial on Java inheritance showed you the basics of inheritance, specifically how to use Java’s extends and super keywords to derive a child class from a parent class, invoke parent class constructors and methods, override methods, and more. Now, we’ll turn our focus to the mothership of the Java class inheritance hierarchy, java.lang.Object.

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