用JAVA怎麼編一個長方形的面積

package com.area;

public class Area {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

juxing a=new juxing();

a.setHeight(20);

a.setLength(20);

a.setArea(a.getHeight()*a.getLength());

System.out.println(a.getArea());

}

}

class juxing{

public int length;

public int height;

public int area;

public int getArea() {

return area;

}

public void setArea(int area) {

this.area = area;

}

public int getHeight() {

return height;

}

public void setHeight(int height) {

this.height = height;

}

public int getLength() {

return length;

}

public void setLength(int length) {

this.length = length;

}