LintCode-454.矩阵面积

Rectangle rec = new Rectangle(3, 4);
rec.getArea(); // should get 12

public class Rectangle {
    /*
     * Define two public attributes width and height of type int.
     */
    // write your code here
    public int width;
    public int height;
    /*
     * Define a constructor which expects two parameters width and height here.
     */
    // write your code here
    public Rectangle(int width, int height){
        this.width = width;
        this.height = height;
    }
    /*
     * Define a public method `getArea` which can calculate the area of the
     * rectangle and return.
     */
    // write your code here
    public int getArea(){
        return (this.width * this.height);
    }
}