No constructor logic is required to initialize these fields, in contrast to most other object-oriented languages.
初始化这些字段不需要逻辑上的构造函数，这和很多面向对象语言不同。
Nowadays, the paradigms, namely the object—oriented language and the logic programming language, are two attractive knowledge programming languages.
逻辑语言和面向对象语言是两种引人注目的知识程序设计语言。
High-level languages are commonly classified as procedure-oriented, functional, object-oriented, or logic languages.
高级语言通常分为面向过程的、函数式的、面向对象的或逻辑的语言。
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