The difference and connection between instances and objects in java

Object is an abstract statement. You can think of it as a representative of all instances that conform to its own definition, and instances are the actual embodiment of the object.

You can say that an instance is an object, but you cannot say that an object is an instance. Because when defining an object, you only define its own rules and logic, an instance can make itself different from other instances by inputting different data.

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For example: you can define a Wheel.java, which is an object; and Test.java can define two An instance of wheel.

//   Wheel.java  
  public   class   Wheel{   //   这个问是wheel对象  
    private   int   radius;  
   
    public   Wheel(){  
    }  
    public   Wheel(int   radius){  
      this.radius   =   radius;  
    }  
  }

  //   Test.java  
  public   class   Test{  
        Wheel   wheel1   =   new   Wheel(3);   这个是一个Wheel实例  
        Wheel   wheel2   =   new   Wheel(5);   这个是另一个Wheel实例  
  }

The object is an abstract statement, and the instance is the concrete manifestation. Abstract objects into classes; instantiate classes into objects.

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