矩形类 求面积

package org.hanqi.pn0120;

//公共的
public class juxing {

//私有的  类的内部
private double chang;

//保护的
protected double kuan;

public double getChang()
{
return chang;
}

public double getKuan()
{
return kuan;
}

public juxing(double chang,double kuan)
{
//        chang=10;
//        kuan=5;

this.chang=chang;
this.kuan=kuan;
}

//计算面积
public double  getMianJi() //动词+名词
{
return  this.chang*this.kuan;
}

public static void main(String[] args) {

juxing myJX=new juxing(10,5);

myJX.chang=19;

System.out.println("长="+myJX.chang);

System.out.println("矩形的面积是="+myJX.getMianJi());

}
}