Question

这道java题怎么实现？

暂时还没学到类与对象

Answer 1

1. SquareClass

2. length

3. getArea()

4. SquareClass obj = new SquareClass();

5. obj.length

6. area = obj.getArea();
   

Answer 2

class SquareClass {

double length;
double getArea() {
double area = length * length;
return area;
}
}
public class Main1 {
public static void main(String[] args) {
SquareClass obj = new SquareClass();
Scanner in = new Scanner(System.in);
obj.length = in.nextDouble();
double area = obj.getArea();
System.out.println(area);
}
}

Answer 3

class SquareClass {

double length;
double getArea() {
double area = length * length;
return area;
}
}
public class Main1 {
public static void main(String[] args) {
SquareClass obj = new SquareClass();
Scanner in = new Scanner(System.in);
obj.length = in.nextDouble();
double area = obj.getArea();
System.out.println(area);
}
}
额就是这个