Difference: 1. Java needs to run on the JVM of JDK or JRE; JavaScript runs on the web browser, so no specific platform is required. 2. JavaScript is a dynamically typed language, and Java is a statically typed language. 3. JavaScript is weakly typed, and Java is strongly typed.
The operating environment of this tutorial: windows7 system, javascript1.8.5&&java8 version, Dell G3 computer.
The connection between JavaScript and Java:
While both languages are different, there are some similarities on a broader level.
1. OOPS (Object-Oriented Programming) Concept
Both languages follow the OOPS (Object-Oriented Programming) concept. You already know about working with objects in Java. Similarly, in JS, objects are the same as the relationships between them.
2. Front-end development
JavaScript can be added directly to HTML, and Java can also be used as Java Applet (Java applet).
The difference between JavaScript and Java:
1. Java is an object-oriented language, and JavaScript is a scripting language based on objects and event-driven languages.
2. Java needs to run on the JVM (Java Virtual Machine) of JDK or JRE; JavaScript runs on the web browser, so no specific platform is required. Java mainly runs on the server side; JavaScript mainly runs on the client browser.
3. Java source code must be compiled before execution, but JavaScript code does not need to be and can be directly interpreted and executed by the browser.
4. JavaScript is a dynamically typed language; Java is a statically typed language. Java cannot change the length of an array after it is defined, but JavaScript can.
5. JavaScript is weakly typed, that is, it does not need to be declared before use, but the browser interpreter checks the data type at runtime; Java is strongly typed, that is, all variables must be declared before compilation;
6. JavaScript’s object-oriented implementation is based on prototype (prototype-based), and Java is based on class (class-based);
7. Java’s grammar rules are stricter than JavaScript’s The more strict, the more powerful the function.
8. Java language code is a language that has nothing to do with HTML; JavaScript language code is a text character format that can be directly embedded in HTML documents and can be loaded dynamically.
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