What is the difference between go language and Java language?

Difference: 1. Go does not allow function overloading and must have unique names for methods and functions; java allows function overloading. 2. Java allows polymorphism by default, but Go does not. 3. Go code can automatically scale to multiple cores; Java is not always scalable enough. 4. Java does not support multiple inheritance, but Go supports multiple inheritance.

The operating environment of this article: windows10 system, Go 1.11.2, thinkpad t480 computer.

Related recommendations: "Go Video Tutorial"

What is go language?

Go, also known as Golang, is a programming language. As an open source programming language, Go makes it easy to build reliable, simple and efficient software.

Go is a typed statically compiled language. The Go language provides garbage collection, CSP-style concurrency, memory safety, and structural typing.

What is java?

Java is a general-purpose computer programming language that is class-based, concurrent, and object-oriented. Java is specifically designed to contain very few implementation dependencies. Java applications run on JVM (Java Virtual Machine). It is one of the most famous and well-known programming languages ​​today.

Java is a programming language used to develop software for multiple platforms. The compiled code or bytecode on a Java application can run on most operating systems, including Linux, Mac OS, and Linux. Much of Java's syntax is derived from C and the C language.

The difference between go language and Java

1. Function overloading

Function overloading is not allowed on Go, you must have methods and functions unique name. Java allows function overloading.

2. Speed

go is faster than java

3. Polymorphism

Java allows polymorphism by default. However, Go does not.

The polymorphic implementation in Java follows a principle: when a superclass object reference variable refers to a subclass object, the type of the referenced object rather than the type of the reference variable determines whose member method is called, but this is The method called must be defined in the superclass, that is, a method overridden by the subclass. Polymorphism in Java can be achieved through two methods: inheritance-based and interface-based.

The Go language generally does not allow different types of assignments, that is, it does not support traditional polymorphism. Interface is an exception and can be assigned with different types. As long as a type implements the interface, we can assign variables of that type to variables of the interface.

4. Routing configuration

The Go language uses the HTTP protocol for routing configuration; while java uses Akka.routing.ConsistentHashingRouter and Akka.routing.ScatterGatherFirstCompletedRouter for routing configuration.

5. Scalability

Go code can automatically scale to multiple cores; however, Java does not always have sufficient scalability.

6. Type system:

There are two completely independent type systems in JAVA. One is the value type system, byte, int, boolean, char, double and the other is object. Object type system with type root, Integer, HashMap, etc. If the value type system wants to use object type references, it needs to be boxed. Most types in the Go language have value semantics, including some composite types such as arrays, structures, etc., and these types can have methods. We can add new methods to any type. At the same time, Go language can obtain a reference to an object through &, such as var b=&a

7. Object passing:

Object methods in Java will have a hidden this pointer passed, while in Go language Object-oriented is just expressed in a different grammatical form. There is no hidden this pointer, that is, the target imposed by the method is passed explicitly and is not hidden. In addition, the target applied by the method is not necessarily a pointer (java passes a pointer to an object). If it is a pointer, it does not need to be named this.

8. Initialization:

There are default constructors or user-defined constructors in Java, which are not needed in Go. You can customize an ordinary function.

9. Accessibility of members:

In Java, keywords such as private, protected, public, and package are used for access control. If you want a symbol to be accessible from other packages, you need to define the symbol starting with an uppercase letter. Symbols starting with a lowercase letter can only be accessed within the package.

10. Inheritance:

Inheritance in Java is completed through the extends keyword and does not support multiple inheritance. Inheritance in Go language is completed through anonymous composition: the base class is defined in the form of Struct, and the subclass only needs to put the base class as a member in the definition of the subclass, and the memory layout can be changed by adjusting the position of the base class members, supporting multiple inheritance. .

11. Interface:

The interface in Java exists as a contract in different components and is mandatory. The class must declare that it implements an interface and needs to inherit from the interface. Even if there are two identical interfaces but only different names, whether the class implements the interface can only be determined based on whether the implementation interface declared by the class includes the interface. This is called an "intrusive" interface.

The GO language uses a non-intrusive interface. A class only needs to implement all the functions required by the interface, then we say that the class implements the interface. The GO language can perform interface query (whether the object pointed to by the interface implements another interface), type query, etc. through the interface.

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