I'm curious about the use of boolean in Java.

I think it's a code to show the difference between the field of the same name and the method.

The DrumKit class has two methods: the boolean playSnare field and the void playSnare().

d.playSnare = false;

The above code uses the field boolan playSnare and

d.playSnare();

will use the method voidplaySnare().

I think I wanted to explain that depending on whether the operator you use in this way is = or (), the field or method that you access even if it is the same name.

I don't think true and false have any meaning.

Note that for C++, compilation errors can occur when methods and fields have the same name.

Properties and methods are different.

Properties represent properties for that object, and methods represent actions.

For example, if it's an object called a car...Color, displacement, etc. become properties, and methods such as forward, backward, etc.

Unlike modern languages, Java is a must. Point to the field if there is no () and method if there is ().

I don't know what explanation the example was given in the question, but it seems to be lacking in object-oriented terms.

I think it should be designed as below.

class DrumKit{

    //boolean topHat = true;            
    Private boolean is TopHat = true; // Encapsulation. TopHat Existence
    //boolean playSnare = true;
    Private boolean isPlaySnare = true; // Snare playability

    public void playSnare() {
        If(isPlaySnare) // If true, do it
            System.out.println("bang bang ba-bang");
    }

    public void playTopHat() {
        if(isTopHat)
            System.out.println("ding ding da-ding");
    }

    public void setIsTopHat(boolean value){
        isTopHat = value;
    }
    public boolean getIsTopHat (){
        return isTopHat;
    }

    public void setIsPlaySnare(boolean value){
        isPlaySnare= value;
    }
    public boolean getIsPlaySnare (){
        return isPlaySnare; 
    }

}