用Java语言设计一个point类，包含xy2个属性，编写setxy0方法和showxy（）输出方法。再设计一个circle类，circle类继承自point类，包含1个属性r。编写setr方法和show-xyr（）输出方法。生成多个对象进行测试。

Point类的实现：

public class Point {
    private int x;
    private int y;
    
    public void setxy0() {
        x = 0;
        y = 0;
    }
    
    public void showxy() {
        System.out.println("x = " + x + ", y = " + y);
    }
}

Circle类的实现：

public class Circle extends Point {
    private int r;
    
    public void setr(int r) {
        this.r = r;
    }
    
    public void showxyr() {
        System.out.println("x = " + x + ", y = " + y + ", r = " + r);
    }
}

测试代码：

public class Test {
    public static void main(String[] args) {
        Point p1 = new Point();
        p1.setxy0();
        p1.showxy(); // 输出：x = 0, y = 0
        
        Circle c1 = new Circle();
        c1.setr(5);
        c1.showxyr(); // 输出：x = 0, y = 0, r = 5
        
        Circle c2 = new Circle();
        c2.setxy0();
        c2.setr(10);
        c2.showxyr(); // 输出：x = 0, y = 0, r = 10
    }
}