内部类的使用以及抽象类的实现

package zhj_test;public class Point {public Point() {//TODO}public Point(String Name, String address) {this.aName = Name;Point.aAddress = address;}public String toString() {return this.getClass().getName() + "[" + getName() + ", " + Point.aAddress + "]";}public void setName(final String name) {this.aName = name;}public String getName() {return aName;}private String aName;public static String aAddress;static {aAddress = "BeiJing";}{aName = "asdfasdfasfadsf";}public static void print(Object obj) {System.out.println(obj);}public static void main(String[] args) {Point p = new Point();Point.print(p);Point p1 = new Point("Yoyo", "ShenYang");Point.print(p);Point.print(p1);Person[] ps = new Person[2];ps[0] = new Manager("zhj", "Beijing", "1010", 32);ps[1] = new Employee("test", "Beijing", "1010", 6);for (Person s : ps) {System.out.println(s.toString());}}abstract public static  class  Person {public Person() {}public Person(int age) {this.setAge(age);}public abstract String getName();public abstract String getAddress();public abstract String getCode();public abstract String toString();public int getAge() {return age;}public void setAge(int age) {this.age = age;}private int age;}public  static class Manager extends Person {public Manager() {//TODO}public Manager(String name, String address, String code, int age) {super.setAge(age);this.aName = name;this.aAddress = address;this.aCode = code;}public String getName() {return aName;}public String getAddress() {return aAddress;}public String getCode() {return aCode;}public String toString() {return this.getClass().getName() + "[Name=" + this.getName() + ", age=" + this.getAge() +", address=" + this.getAddress() + ", Code=" + this.getCode();}private String aName;private String aAddress;private String aCode;}public static class Employee extends Person {public Employee() {//TODO}public Employee(String name, String address, String code, int age) {super.setAge(age);this.aName = name;this.aAddress = address;this.aCode = code;}public String getName() {return aName;}public String getAddress() {return aAddress;}public String getCode() {return aCode;}public String toString() {return this.getClass().getName() + "[Name=" + this.getName() + ", age=" + this.getAge() +", address=" + this.getAddress() + ", Code=" + this.getCode();}private String aName;private String aAddress;private String aCode;}}

说明：1> 内部类的实现如上代码所示，由于在Java中，类中的静态方法不能直接调用动态方法。只有将内部类修饰为静态类（publicstatic ***），然后才能够在静态类中调用该类的成员变量与成员方法。2> 抽象类：关键字abstract(超类的前部，以及超类中的抽象方法，必须含有此关键字)，方式：抽象类 ：abstract class ***。抽象方法：public abstract String *** ...子类必须实现所有的抽象方法！