5. 创建一个Shape类(形状)，属性int x(x坐标), int y(y坐标)，定义有参无参，set/get/toString方法 创建一个Square类(方形)继承Shape类，定义有参无参，set/get/toString方法 创建一个Triangle类(三角形)继承Shape类，定义有参无参，set/get/toString方法 在main方法中创建4个Square对象，将四个点连起来是一个正方形，输出这4个点 在main方法中创建3个Triangle对象，将三个点连起来是一个等腰三角形，输出这个3个点

好的，我知道了。以下是代码实现：

// Shape类
public class Shape {
    private int x;
    private int y;

    public Shape() {
    }

    public Shape(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    @Override
    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}

// Square类
public class Square extends Shape {
    public Square() {
    }

    public Square(int x, int y) {
        super(x, y);
    }

    @Override
    public String toString() {
        return "Square{" +
                "x1=" + getX() +
                ", y1=" + getY() +
                ", x2=" + (getX() + 1) +
                ", y2=" + getY() +
                ", x3=" + (getX() + 1) +
                ", y3=" + (getY() + 1) +
                ", x4=" + getX() +
                ", y4=" + (getY() + 1) +
                '}';
    }
}

// Triangle类
public class Triangle extends Shape {
    public Triangle() {
    }

    public Triangle(int x, int y) {
        super(x, y);
    }

    @Override
    public String toString() {
        return "Triangle{" +
                "x1=" + getX() +
                ", y1=" + getY() +
                ", x2=" + (getX() + 1) +
                ", y2=" + getY() +
                ", x3=" + getX() +
                ", y3=" + (getY() + 1) +
                '}';
    }
}

// main方法
public static void main(String[] args) {
    // 创建4个Square对象
    Square square1 = new Square(0, 0);
    Square square2 = new Square(1, 0);
    Square square3 = new Square(1, 1);
    Square square4 = new Square(0, 1);

    // 输出这4个点
    System.out.println(square1);
    System.out.println(square2);
    System.out.println(square3);
    System.out.println(square4);

    // 创建3个Triangle对象
    Triangle triangle1 = new Triangle(0, 0);
    Triangle triangle2 = new Triangle(1, 0);
    Triangle triangle3 = new Triangle(0, 1);

    // 输出这3个点
    System.out.println(triangle1);
    System.out.println(triangle2);
    System.out.println(triangle3);
}

输出结果如下：

Square{x1=0, y1=0, x2=1, y2=0, x3=1, y3=1, x4=0, y4=1}
Square{x1=1, y1=0, x2=2, y2=0, x3=2, y3=1, x4=1, y4=1}
Square{x1=1, y1=1, x2=2, y2=1, x3=2, y3=2, x4=1, y4=2}
Square{x1=0, y1=1, x2=1, y2=1, x3=1, y3=2, x4=0, y4=2}
Triangle{x1=0, y1=0, x2=1, y2=0, x3=0, y3=1}
Triangle{x1=1, y1=0, x2=2, y2=0, x3=1, y3=1}
Triangle{x1=0, y1=1, x2=1, y2=1, x3=0, y3=2}