java -继承-练习集锦

1.下面这段代码的输出结果是什么？

ublic class Test {
    public static void main(String[] args)  {
        new Circle();
    }
}
 
class Draw {
     
    public Draw(String type) {
        System.out.println(type+" draw constructor");
    }
}
 
class Shape {
    private Draw draw = new Draw("shape");
     
    public Shape(){
        System.out.println("shape constructor");
    }
}
 
class Circle extends Shape {
    private Draw draw = new Draw("circle");
    public Circle() {
        System.out.println("circle constructor");
    }
}

2.下面这段代码的输出结果是什么？

public class Test {
    public static void main(String[] args)  {
        Shape shape = new Circle();
        System.out.println(shape.name);
        shape.printType();
        shape.printName();
    }
}
 
class Shape {
    public String name = "shape";
     
    public Shape(){
        System.out.println("shape constructor");
    }
     
    public void printType() {
        System.out.println("this is shape");
    }
     
    public static void printName() {
        System.out.println("shape");
    }
}
 
class Circle extends Shape {
    public String name = "circle";
     
    public Circle() {
        System.out.println("circle constructor");
    }
     
    public void printType() {
        System.out.println("this is circle");
    }
     
    public static void printName() {
        System.out.println("circle");
    }
}