主类
public class Exam5_1{
   public static void main(String args[]){
      Gradstudent stu1=new Gradstudent();
      stu1.setname("mike");
      stu1.setage(18);
      stu1.status(false);
      char stu1.getname();
      int stu1.getage();
      boolean stu1.status();
      }
   }
Student类
class Student{
   char name;
   int age;
   public void setname(char name){
      name=name;
      }
   public void setage(int age){
      age=age;
      }
   char getname(){
      System.out,println(name);
      }
   int getage(){
      System.out.println(age);
      }
   }
Gradstudent类
public class Gradstudent extends Student{
   boolean marriedstatus;
   public void setstatus(boolean marriedstatus){
     marriedstatus=marriedstatus;
     }
   public boolean getstatus(){
     System.out.println("His marriedstatus is"+marriedstatus);
     }
   }
老是显示出错
Exam5_1.java:7: 错误: 需要';'
      char stu1.getname();
               ^
Exam5_1.java:8: 错误: 需要';'
      int stu1.getage();
              ^
Exam5_1.java:9: 错误: 需要';'
      boolean stu1.status();
                  ^
3 个错误
为什么？？？

char getname(){
      System.out,println(name);
      }
   int getage(){
      System.out.println(age);
      }
   public boolean getstatus(){
     System.out.println("His marriedstatus is"+marriedstatus);
     }
方法声明了返回类型，方法体内只有打印语句，没有return。其实打印这里就不需要，但是return是不能缺的。正确的是下面：
   char getname(){
      return name;
      }
   int getage(){
      return age;
      }
   public boolean getstatus(){
     return marrigedstatus;
     }

我试过了，可是还是那样的错误

我试过了，可是还是那样的错误

方法写错了，char getname(){
      System.out,println(name);
      }
   int getage(){
      System.out.println(age);
      }
每一个方法名前面的类型表示的是返回值类型，你写什么就要返回什么
另外，既然名字输入的是字符串，那你之前设置变量的类型就应该是String而不应该是char
public class Exam{
    public static void main(String args[]){
        Gradstudent stu1=new Gradstudent();
        stu1.setname("mike");
        stu1.setage(18);
        stu1.setstatus(false);
        stu1.getname();
        stu1.getage();
        stu1.getstatus();
    }
}

class Student{
    String name;
    int age;
    public void setname(String name){
        this.name=name;
    }
    public void setage(int age){
        this.age=age;
    }
    public void getname(){
        System.out.println(name);
    }
    public void getage(){
        System.out.println(age);
    }
}

class Gradstudent extends Student{
    boolean marriedstatus;
    public void setstatus(boolean marriedstatus){
        marriedstatus=marriedstatus;
    }
    public void getstatus(){
        System.out.println("His marriedstatus is " +marriedstatus);
    }
}

嗯，5楼说的对，get（）函数错了没有返回值

你要的应该是这个效果吧！
public class Exam5{
       public static void main(String args[]){
          Gradstudent stu1=new Gradstudent();
          stu1.setname("mike");
          stu1.setage(18);
          stu1.setstatus(false);
          System.out.println(stu1.getname());
           System.out.println(stu1.getage());
         System.out.println("His marriedstatus is"+stu1.getstatus());
          }
       }
    //student类
    class Student{
      String name;
       int age;
       public void setname(String name){
          this.name=name;
          }
       public void setage(int age){
          this.age=age;
          }
       public String getname(){
         return this.name;
          }
       public int getage(){
          return age;
          }
       }
    //Gradstudent类
     class Gradstudent extends Student{
       boolean marriedstatus;
       public void setstatus(boolean marriedstatus){
         this.marriedstatus=marriedstatus;
         }
       public boolean getstatus(){
       return marriedstatus;
         }
       }

你把char类型改成String类型就对了