定义长方形类Rectangle，含属性： int width； int height。方法：Rectangle()：宽、高默认值为1；Rectangle(int val)：宽、高均为参数值；Rectangle(int width,int height)：Double getSquare()：计算面积；Double getPerimeter():计算周长。另外编写测试类进行测试。

好的，以下是 Rectangle 类的定义和测试代码：

public class Rectangle {
    private int width;
    private int height;

    public Rectangle() {
        this.width = 1;
        this.height = 1;
    }

    public Rectangle(int val) {
        this.width = val;
        this.height = val;
    }

    public Rectangle(int width, int height) {
        this.width = width;
        this.height = height;
    }

    public double getSquare() {
        return width * height;
    }

    public double getPerimeter() {
        return 2 * (width + height);
    }
}

测试代码：

public class RectangleTest {
    public static void main(String[] args) {
        Rectangle r1 = new Rectangle();
        System.out.println("r1: width=" + r1.width + ", height=" + r1.height);
        System.out.println("r1 square=" + r1.getSquare() + ", perimeter=" + r1.getPerimeter());

        Rectangle r2 = new Rectangle(5);
        System.out.println("r2: width=" + r2.width + ", height=" + r2.height);
        System.out.println("r2 square=" + r2.getSquare() + ", perimeter=" + r2.getPerimeter());

        Rectangle r3 = new Rectangle(3, 4);
        System.out.println("r3: width=" + r3.width + ", height=" + r3.height);
        System.out.println("r3 square=" + r3.getSquare() + ", perimeter=" + r3.getPerimeter());
    }
}

输出结果：

r1: width=1, height=1
r1 square=1.0, perimeter=4.0
r2: width=5, height=5
r2 square=25.0, perimeter=20.0
r3: width=3, height=4
r3 square=12.0, perimeter=14.0

注意，这里的周长和面积都是 double 类型的，而不是 int 类型。