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ÏÈ¿´Ò»ÏµÄjava´úÂ룺 class Person  {  private String name="";  private int age=0;  public Person()  {     System.out.println("personÎÞ²ÎÊý¹¹Ô캯Êý");  }  public Person(String name,int age)  {  this.name=name;  this.age=age;     System.out.println("person 2 ²ÎÊýµÄ¹¹Ô캯Êý");    }  }   class Student extends Person  {  private String school;  private String grade;  public Student()  {     System.out.println("student ÎÞ²ÎÊýµÄ¹¹Ô캯Êý");  }  public Student(String name ,int age,String school)  {     System.out.println("student 3 ²ÎÊýµÄ¹¹Ô캯Êý");  }  public   Student(String name ,int age,String school,String grade)  {  super(name,age);  this.school=school;  this.grade=grade;     System.out.println("student 4 ²ÎÊýµÄ¹¹Ô캯Êý£¬super().");  }  }  class Test  {  public static void main(String [] args)  {     System.out.println("st1:");     Student st2=new Student();        System.out.println("---------------------------");     System.out.println("st2:");     Student st=new Student("zhangshan",76,"Îä´ó");     System.out.println("---------------------------");     System.out.println("st3:");     Student st3=new Student("lisi",24,"Îä´ó","Ñо¿Éú");  }  }  /*  =======================================  Êä³öÈçÏ£º  E:\JavaWork>java Test  st1:  personÎÞ²ÎÊý¹¹Ô캯Êý  student ÎÞ²ÎÊýµÄ¹¹


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