public class Rectangle{
    private int length;
    private int width;
    
    public Rectangle(int length,int width){
      this.length=length;
      this.width=width;
    }
    
    public void set(int length,int width){
      this.length=length;
      this.width=width;
    }
    
    public void get(){
    System.out.println("此长方形的长为"+length+",宽为"+width);
    }
    
    public int getLength(){
     return length;
    }
    
    public int getWidth(){
      return width;
    }
    
    public int calculatePerimeter(){
     return 2*(length+width);
    }
    
    public int calculateArea(){
      return (length*width);
    }
    
    public void print(){
    System.out.println("此长方形的周长为"+calculatePerimeter()+",面积为"+calculateArea());
   }
   
   public String toString(){
    String str;
    str = "The perimetre of the rectangle is: " + calculatePerimeter() + 
    ", Area is: "+calculateArea();
    return str;
       
   }
   
   public static void main(String [ ] args){
    Rectangle myrectangle=new Rectangle(15,10);
    Rectangle myrec02=new Rectangle(12,36);
    myrectangle.get();
    myrectangle.print();
    myrectangle.set(20,15);
    System.out.println("长方形的长是"+myrectangle.getLength()+
    ",宽是"+ myrectangle .getWidth());
   myrectangle.print();
   System.out.println(myrectangle);
   System.out.println(myrec02);
   
   
   
   
  }
   
}








/**
 
 
public class HelloWorld {
	public static void main(String[] args) {
		
		
		System.out.println("我在编程中国学JAVA");
		System.out.println();

		// 练习一下循环的使用
		for (int i=1; i<=20; i++) {
			System.out.printf("我爱编程中国 %d 次\n", i);
		}

		System.out.printf("\n\n绘制一个心形图案：");

		float x, y;
		for (y = (float)1.5; y > -1.5; y -= 0.1) {
			for (x = (float)-1.5; x < 1.5; x += 0.05) {
				float a = x * x + y * y - 1;
				if ((a * a * a - x * x * y * y * y) <= 0.0) {
					System.out.print("*");
				} else {
					System.out.print(" ");
				}
			}
			System.out.println();
		}
		
		
	}
}

*/