Java foundation - comments, keywords, identifiers

- Chunhuaqiuyue when, past Know ~

1 comment

• We usually write code in less time than the code, we can also read their own writing, but when once the project structure complicated, we need to use the Notes

• Notes and will not be executed, it is to write the code to see us

• Write notes is a very good habit

• Java annotations in three ways:

  • Single-line comments

    // 注释内容

  • Multi-line comments

    /* 注释内容 */

  • Documentation Comments

    /** 注释内容 */

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2, Keyword

3, the identifier

• Identifier : refers to the program, we own custom content. Variables such as the name and the name of the class, method name, are represented by symbols
  • HelloWorld case, there appears identifier class nameHelloWorld
• Naming rules :
  • The identifier may comprise 英文字母26个(区分大小写), 0-9数字, $(美元符号),_(下划线)
  • Identifiers can not begin with a number
  • Identifiers can not be keywords
• Naming convention :
  • Specification class name: the first letter capitalized, followed by the first letter of each word big (big camel) write
  • Variable name specification: the first letter lowercase, behind each word capitalized (small camel)
  • Method name specification: the same variable name