java练习---14

 abstract class A{
     private String name;
     public A(String name) {
         this.name = name;
     }
     public String getName() {
         return this.name;
     }
     public abstract void fun();
 }
 class B extends A{
     public B(String name) {
         super(name);
     }
     public void fun() {
         System.out.println(super.getName());
     }
 }
 public class L {
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         B b = new B(null);
         b.fun();
     }
 }
 import java.sql.Date;
 
 @SuppressWarnings("unused")
 public abstract class Y {
     private String name;
     private String Class;
     private String date;
 
 public String getName() {
     return this.name;
 }
 public void setName(String name) {
     this.name = name;
 }
 public String GetClass() {
     return this.Class;
 }
 public void setClass(String Class) {
     this.Class = Class;
 }
 public String getDate() {
     return this.date;
 }
 public void setDate(String date) {
     this.date = date;
 }
 public Y(String name,String Class,String date) {
     this.name = name;
     this.Class = Class;
     this.date = date;
 }
 public Y() {
     super();
 }
 
 @Override
 public String toString() {
     return "Student [name=" + name + "]";
 }
 public abstract String speak();
 
 }
 import java.sql.Date;
 @SuppressWarnings("unused")
 public class H extends Y{
     private String matter;
     public H(String name,String Class,String date,String matter) {
         super(name,Class,date);
         this.setMatter(matter);
     }
     @Override
     public String speak() {
         return "我叫 " + super.getName() + " 今年 " + super.GetClass() + " 身高 " + super.getDate() + " 体重 " + this.matter;
     }
     public String getMatter() {
         return matter;
     }
     public void setMatter(String matter) {
         this.matter = matter;
     }
 
 }
 public class K {
 
     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Y stu = new H("罗元昊，","19岁了，","173cm，","52KG。");
         print(stu.speak());
     }
 
     private static void print(String speak) {
         System.out.println(speak);
 
     }
 
 }