Java object oriented basic teaching of 1

Directory 1. How to define classes 2. How to define attributes 3. How to define common methods 4. How to create objects 5. How to define constructors 6. What are mutable parameters and how to use them? Summarize

1. How to define a class

Syntax:

Access modifier class class name {

}

public class skills{

}

2. How to define attributes

Syntax:

Attributes are written in the class

Data type variable name;

public class hero{
    String sex;
    String name;
}

3. How to define a common approach

Syntax:

Access modifier return value method name (parameter) {

}

public void attack(){
     Circulatory body ;
}

4. How do I create an object

Syntax:

Class name Object name = new class name ();

5. How to define constructors

Syntax:

The constructor has no return value, and the method name must remain 1 with the class name.
Constructor creates an object automatically calling

public class hero{
    public hero(){
         Circulatory body ;
    }
}

6. What are variable parameters and how to use them?

The bottom layer of variable parameters is an array. According to the number of parameters passed, arrays with different lengths will be created to store the number of parameters passed by these parameters, which can be 0 (not passed) or multiple.

Declaration syntax:

public static void testVarargs(String...users){

}

Invoke syntax:

testVarargs ("Parameter 1", "Parameter 2"...);

Summarize

This article is here, I hope to help you, and I hope you can pay more attention to more content of this site!