How to create objects in java

1. Create an object

Generally speaking, a class cannot be used directly. We need to use this class to create an object for use. Generally, there are three steps:

(1) Leading package: It means pointing out where the class to be used is. The format is generally import package name.class name. When it belongs to the same package as the current class, the leading package statement does not need to be written.

(2) Creation: Create objects according to the format. The format is generally class name object name = new class name (). For example, if Student is created, it is Student stu = new Student(). The stu here is our newly created an object name.

(3) Usage: Use member variables and member methods according to the object name. Whoever you want to use, add a dot to the object name, and then add the corresponding member name and method name.

2. Example

The following is a method created using the classes defined above. Two of the classes are under one package, so the import package is omitted. This step.

public class myobject {
 
 
 
    public  static void main(String[] args) {
 
         Student stu = new Student();
 
         System.out.println(stu.age);//0
 
         System.out.println(stu.name);//null
 
         stu.dowork();//做作业
 
         stu.study();//上课！
 
 
 
         stu.name = "小明";
 
        stu.age  = 10;
 
         System.out.println(stu.age);//10
 
         System.out.println(stu.name);//小明
 
    }
 
}

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