An in-depth look at Java identifier naming conventions: a comprehensive guide including naming tips and considerations

Java identifier naming rules

• Letters, numbers, underscores, dollar signs ($)
• cannot start with a number
• cannot be a Java keyword
• cannot be used with classes or classes in the Java class library Method and variable name conflicts
• It is recommended to use camel case naming method
• Variable names should be short and meaningful
• Constant names should be in all uppercase letters, with underscores separating words

Naming Tips

• Use descriptive Name: Variable names should clearly describe what the variable does. For example, a variable that stores a username could be named username.
• Use a consistent naming style: Use a consistent naming style throughout the project to make it easier to read and understand the code. For example, you can use camelCase or underscore case.
• Avoid using abbreviations: Abbreviations can make code difficult to read and understand. For example, don't abbreviate username to un.
• Avoid using special characters: Special characters can make code difficult to read and understand. For example, don't use spaces or exclamation points in variable names.

Note

• Do not use Java keywords: Java keywords are special words used to represent language structures . For example, if, else, and for are Java keywords. You cannot name a variable or method name as a Java keyword.
• Do not conflict with the names of classes, methods, and variables in the Java class library: The Java class library contains many classes, methods, and variables. You cannot name a variable or method name that conflicts with a class, method, or variable name in a Java class library.
• Don’t use confusing names: Don’t use confusing names to avoid making the code difficult to read and understand. For example, do not confuse l with 1, and do not confuse O with 0.

Code Example

// 使用描述性名称
String username = "john.doe";

// 使用一致的命名风格
int age = 30;
double salary = 50000.00;

// 避免使用缩写
String firstName = "John";
String lastName = "Doe";

// 避免使用特殊字符
String address = "123 Main Street";

// 不要使用 Java 关键字
int if = 10; // 错误：if 是 Java 关键字

// 不要与 Java 类库中的类、方法、变量名冲突
String System = "System"; // 错误：System 是 Java 类库中的类

// 不要使用易混淆的名称
int l = 1; // 错误：l 和 1 容易混淆
int O = 0; // 错误：O 和 0 容易混淆

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