Java Programming Masterclass 学习笔记（一）

Section 1: Getting Started

Section 2: Programming Tools Setup

Section 3: First Steps

Hello World

1

System.out.println("Hello, World");

Variables

Keyword

1. A keyword is any one of a number of reserved words, that have a predefined meaning in the Java language.
2. In Java syntax, all code is case-sensitive, and this includes keywords. As we’ll soon see, an int, all in lowercase, is not the same as Int, with a capital I. Here, an int, (all in lowercase) is a keyword in Java.

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