摘要：Class A blueprint defining the charactaristics and behaviors of an object of that class type. Class names should be written in CamelCase, starting wit 阅读全文

摘要：Boolean A logical statement that evaluates to true or false. In some languages, true is interchangeable(可互换的) with the number 1 and false is interchan 阅读全文

摘要：Operators These allow you to perform certain operations on your data. There are 3 basic types: Arithmetic Operators The binary operators used for arit 阅读全文

摘要：Primitive Data Types Java has 8 primitive data types: byte, short, int, long, float, double, boolean, and char. For most challenges, you'll only need 阅读全文

摘要：a class is a collection of variables (fields) and functions called methods. A program is a collection of classes. The basic code for declaring a Java 阅读全文