Java中的表达式:基本、普遍、被忽视?

L. Chiodini, Igor Moreno Santos, Matthias Hauswirth
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引用次数: 0

摘要

表达式是形式语言(如lambda演算)以及密切模仿它的编程语言的构建块。虽然表达式也是Java等语言程序的重要组成部分,但主要不是函数式的,教学实践通常不太关注表达式。我们对Java语言进行了理论分析,并对初学者在Java程序中使用表达式进行了实证分析,以了解表达式在编写程序中所起的作用。然后,我们继续系统地分析Java教材,以描述它们如何表示表达式。我们的研究结果表明,表达式是Java中的一个基本结构,它们在学生代码中很普遍,但是当前的教科书并没有将表达式作为核心的、通用的和组合的概念来介绍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Expressions in Java: Essential, Prevalent, Neglected?
Expressions are the building blocks of formal languages such as lambda calculus as well as of programming languages that are closely modeled after it. Although expressions are also an important part of programs in languages like Java, that are not primarily functional, teaching practices typically don’t focus as much on expressions. We conduct both a theoretical analysis of the Java language, as well as an empirical analysis of the use of expressions in Java programs by novices, to understand the role expressions play in writing programs. We then proceed by systematically analyzing teaching materials for Java to characterize how they present expressions. Our findings show that expressions are an essential construct in Java, that they are prevalent in student code, but that current textbooks do not introduce expressions as the central, general, and compositional concept they are.
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