testperson.java

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class Person
{
  protected String name;
  protected String sex;
  Person(String name,String sex)
  {
    this.name=name;
    this.sex=sex;
  }
  public String toString()
  {
    String s=new String();
    s=name+"\t"+sex;
    return s;
  }
}
class Student extends Person
{
  protected int age;
  protected char grade;
  Student(String name,String sex,int age,char grade)
  {
    super(name,sex);
    this.age=age;
    this.grade=grade;
  }
  void print()
  {
    String s=new String();
    s=super.toString();
    s=s+"\t"+age+"\t"+grade;
    System.out.println(s);
  }
}
public class TestPerson
{
  public static void main(String[ ] args)
  {
    Student st1=new Student("李楠","女",22,'C');
    Student st2=new Student("赵彬","男",25,'A');
    System.out.println("姓名"+"\t性别"+"\t年龄"+"\t成绩等级");
    st1.print();
    st2.print();
  }
}