packexam.java

来自「Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程」· Java 代码 · 共 16 行

package myPack; //与Pen类一样，也将PackExam类放在myPack包中

public class PackExam {
  public static void main(String args[]) {
    Pen p1 = new Pen("Red", 20); //直接使用myPack包中的Pen类
    //使用Pen的方法getColor()和getLength()
    System.out.println("the color of my Pen is " + p1.getColor());
    System.out.println("the length of my Pen is " + p1.getLength());
    p1.setColor("Black");
    p1.setLength(15);
    System.out.println("修改后 ");
    System.out.println("the color of my Pen is " + p1.getColor());
    System.out.println("the length of my Pen is " + p1.getLength());
  }
}