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You’ll learn how to use the parameters of the method main in Chapter 9 in the section Command Line Arguments. The method main has parameters - and an array of text values String args. It’s the data that could be given to the method from another place of the program that invokes this method.
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arguments), which go inside the parentheses. The method name main goes right before parentheses. The keyword void means that the method main doesn’t return any data to whomever calls it (JRE in this case). We’ll talk about classes and object instances in the next chapter.ĭoes the method main return any data? Say, if you’ll write a method to add two numbers, it can return a result. The keyword static means that you don’t have to create an instance of the HelloWorld object in memory to use this method. The keyword public means that the method main could be accessed by any other Java class or the JRE itself. java -version java version '10.0.2.1-ea' Java(TM) SE Runtime Environment (build 10.0.2.1-ea+13) Java HotSpot(TM) 64-Bit Server VM (build 23.2-b04, mixed mode) Note: If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences application. Preparing to Process the Keys S, Q, and N Processing Keyboard Events in the Controller Networking: Downloading Files From the Internet Serialization: Turning an Object Into Bytes Project: Adding Events Handling for Calculator Data Exchange Between GUI Components And Controller Designing a Sign In Window in Scene Builder Access Levels, Collections, Generics, and Multi-Threading Project: Java Interfaces and Lambda Expressions
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What’s the difference between abstract classes and interfaces? Interfaces, Lambdas, Abstract and Anonymous Classes Meet Classes - the Main Language Constructs