0920作业-----越练越熟，比昨晚快了2个小时~~~

  1 public class Text1{

  2     public static void main(String[] args){
  3         Outter o=new Outter();
  4         //第一题-----上面一句代码是外部类的对象实例化
  5         System.out.println("第一题：");
  6         Outter.B b=o.new B();
  7         b.showA();
  8         b.showB();
  9         //第二题
 10         System.out.println("第二题：");
 11         Outter.Staff s=o.new Staff();
 12         s.name="李四";
 13         System.out.println(s.name);
 14         //第三题-----多态---1 方法重载 2 方法重写 3 对象多态，这里是对象多态
 15         System.out.println("第三题：");
 16         Outter.Car car=o.new Aodi();
 17         car.changeSpeed();
 18         car=o.new Benchi();
 19         car.changeSpeed();
 20         //第四题-----多态
 21         System.out.println("第四题：");
 22         Outter.Rect r=o.new PlaintRect(20,10,10,10);
 23         System.out.println("周长为："+r.perimeter());
 24         System.out.println("周长为："+r.area());
 25         System.out.println("坐标"+(r.isInside(10,20)==true?"有效":"无效"));
 26     }
 27 }
 28 //外部类
 29 class Outter{
 30     //第一题 
 31     //父类A
 32     class A{
 33         public void showA(){
 34             char a[]=new char[26];
 35             for(int i=0,b='a';i<a.length;i++,b++){
 36                 a[i]=(char)b;
 37                 System.out.print(a[i]+" ");                
 38             }
 39             System.out.println();
 40         }
 41     }
 42     //子类B继承父类
 43     class B extends A{
 44         public void showB(){
 45             char a[]=new char[26];
 46             for(int i='A';i<a.length+'A';i++){
 47                 a[i-'A']=(char)i;
 48                 System.out.print(a[i-'A']+" ");
 49             }
 50             System.out.println();
 51         }    
 52     }
 53     //第二题
 54     //父类Penson
 55     class Penson{
 56         protected String name;
 57         protected String address;
 58         protected String telphone;
 59         protected String mail;
 60     }
 61     //Penson的子类Employee
 62     class Employee extends Penson{
 63         protected String office;
 64         protected double wage;
 65         protected String hiredate;
 66     }
 67     //Employee的子类Faculty
 68     class Faculty extends Employee{
 69         protected String degree;
 70         protected String level;
 71     }
 72     //Employee的子类Staff
 73     class Staff extends Employee{
 74         protected String duty;
 75     }
 76     //第三题
 77     //主类Car
 78     class Car{
 79         protected String pinPai;
 80         protected void changeSpeed(){
 81             System.out.println("呜呜呜......");
 82         }
 83     }
 84     //子类Aodi继承Car
 85     class Aodi extends Car{
 86         private double price;
 87         private String xingHao;
 88         public double getPrice(){
 89             return price;
 90         }
 91         public String getXingHao(){
 92             return xingHao;
 93         }
 94         public void changeSpeed(){
 95             System.out.println("变速卡卡卡......");
 96         }
 97     }
 98     //子类Benchi继承Car
 99     class Benchi extends Car{
100         private double price;
101         private String xingHao;
102         public double getPrice(){
103             return price;
104         }
105         public String getXingHao(){
106             return xingHao;
107         }
108         public void changeSpeed(){
109             System.out.println("变速嘟嘟嘟......");
110         }
111     }
112     //第四题
113     //矩形类Rect
114     abstract class Rect{
115         protected int width;
116         protected int height;
117         Rect(){
118             width=10;
119             height=10;
120         }
121         Rect(int width,int height){
122             this.width=width;
123             this.height=height;
124         }
125         protected int area(){
126             return width*height;
127         }
128         protected int perimeter(){
129             return 2*(width+height);
130         }
131         public abstract boolean isInside(int x,int y);
132     }
133     //带坐标的PlaintRect类继承自Rect
134     class PlaintRect extends Rect{
135         private int startX;
136         private int startY;
137         PlaintRect(){
138             this(0,0,0,0);
139         }
142         PlaintRect(int width,int height,int startX,int startY){
143             super(width,height);
144             this.startX=startX;
145             this.startY=startY;
146         }
147         public void setStartX(int startX){
148             this.startX=startX;
149         }
150         public void setStartY(int startY){
151             this.startY=startY;
152         }
153         public int getStartX(){
154             return startX;
155         }
156         public int getStartY(){
157             return startY;    
158         }
159         public boolean isInside(int x,int y){
160             return x>=startX&&x<=(startX+width)&&y<startY&&y>=(startY-height);
161         }
164     }
165 }

 

转载于:https://www.cnblogs.com/kaililikai/p/5889724.html