java答题，急，帮一下

Question

java大题，走过的来看一看。/，。?[,],[,@#$%^&*()__+}|aksldha;ljgdhas;likdhsa

Answer 1

1、

class Square {
  private double length;
  private double width;

  public Square(double length, double width) {
    this.length = length;
    this.width = width;
  }

  public double getArea() {
    return length * width;
  }

  public double getCircumference() {
    return 2 * (length + width);
  }
}

2、

public class MySquare {
  public static void main(String[] args) {
    double length = Double.parseDouble(args[0]);
    double width = Double.parseDouble(args[1]);

    Square s = new Square(length, width);

    if (length >= 20 && length <= 50 && width >= 60 && width <= 90) {
      System.out.println("The area of the square with length " + length + " cm and width " + width + " cm is " + s.getArea() + " cm^2.");
    } else if (length >= 70 && length <= 100 && width >= 30 && width <= 50) {
      System.out.println("The circumference of the square with length " + length + " cm and width " + width + " cm is " + s.getCircumference() + " cm.");
    } else {
      System.out.println("Invalid input.");
    }
  }
}