What is the difference between Java and Perl? A simple comparison of Java and Perl

What is the difference between Java and Perl? The following article will take you to understand Java and Perl, and introduce the differences between Java and Perl. I hope it will be helpful to you. [Recommended video tutorials: Perl tutorial, java tutorial]

What is Java?

Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It is designed to allow application developers to "write once, run anywhere" (WORA), meaning compiled Java code can run on all platforms that support Java without the need for recompilation.

What is Perl?

Perl is a family of high-level, general-purpose, interpreted dynamic programming languages; languages ​​in the family include Perl 5 and Perl 6. Perl supports multiline strings by inserting newlines into the string, or using HERE-DOC syntax. Perl also supports interpolation of scalar, array, and hash elements in strings delimited by double quotes.

What is the difference between Java and Perl?

1. Compilation

Simply put, every time Perl is run, it compiles the source code into bytecode and then starts execution Bytecode. Instead, Java compiles the program into bytecode and then runs the bytecode in the Java Virtual Machine.

2. File extension

Perl programs are saved with the .pl extension. Java programs are saved with the .java extension.

3. Multi-line strings

Perl supports multi-line strings, just insert newlines in the string, or use here-doc syntax; Perl also Supports interpolation of scalar, array and hash elements in strings delimited by double quotes.

Java supports multiline strings by using the "n" escape code to indicate multiline strings and breaking long string constants into pieces on consecutive lines.

4, Associative arrays and hashes

For Perl, the definitions of associative arrays and hashes are very concise. In Java, there is no standard way to define a hash, no concise way to create an associative array.

5. Data types

Perl has few data types. There are 4 types of data: scalar, array, hash, and reference, with a high degree of freedom. Java has many data types, including 8 basic types, plus Collection, Map, Array, etc., and the program is rigorous.

6. Type checking

Perl is dynamically typed, that is, most type checking is performed at runtime. Java is statically typed, i.e. most type checking is performed during compilation.

7. Comments

Inline comments in Perl use #; there are two comment methods in Java: single-line comments use // and multi-line comments use / *...*/.

8. Basic operations

For basic operations, Java is usually more verbose than Perl.

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