Member Avatar for sadzee

Hey, Hi all!
I'm a bachelor student, new to Java.
Following code is giving error in PrintDetails()
What parameters should I define in it??
Kindly check and tag out my mistakes in the following code.. Thanks ^_^

class student
{
String a;String b;char c;double d;
student(String name,String rollno,char gender,double gpa)
{
    a= name; 
    b= rollno;
    c= gender; 
    d= gpa;
}}
class teacher
{
String e;String f;long g;String h;
teacher(String name,String address,long telephoneno,String degree)
{
    e=name;
    f=address;
    g=telephoneno;
    h=degree;
}}
class course
{
    student s1;
    student s2;
    teacher t1;
    int age;
course(student x,student y,teacher z)
{
    s1=x;
    s2=y;
    t1=z;
}
void printDetails()
{
System.out.println();
}}
public class test1
{
public static void main(String args[])
{
    student name=new student();
    course c1=new course("aaaa","11cs11",'f',6.8);
    course c2=new course("uuu","8u8",'p',7.9);
    course c3=new course("uuuttt","99oi88",'m',9.7);
    course j[]={c1,c2,c3};
    c1. printDetails();
    c2.printDetails();
    c3.printDetails();
}}
  • 2 Contributors
  • 2 Replies
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  • 33 Minutes Discussion Span
  • Latest Post Latest Post by NormR1

Dani AI

Generated

The compiler errors come from mismatched constructor usage rather than the printDetails() signature. asked for the error text, but the code shows two common mistakes: calling constructors with the wrong parameter lists (for example calling new student() when no no-arg constructor exists), and passing primitive/string/gpa values to the Course constructor that expects Student and Teacher objects. printDetails() usually does not need parameters if it prints the instance fields of the Course object — create the Student and Teacher objects first, then pass them into the Course constructor.

Example of a corrected approach (uses clearer names and a parameterless printDetails()):

class Student {
  String name;
  String roll;
  char gender;
  double gpa;
  Student(String name, String roll, char gender, double gpa) {
    this.name = name;
    this.roll = roll;
    this.gender = gender;
    this.gpa = gpa;
  }
  String summary() { return name + " (" + roll + ") gpa=" + gpa; }
}

class Teacher {
  String name;
  String addr;
  long phone;
  String degree;
  Teacher(String name, String addr, long phone, String degree) {
    this.name = name; this.addr = addr; this.phone = phone; this.degree = degree;
  }
}

class Course {
  Student s1, s2;
  Teacher teacher;
  Course(Student s1, Student s2, Teacher teacher) { this.s1 = s1; this.s2 = s2; this.teacher = teacher; }
  void printDetails() {
    System.out.println(s1.summary());
    System.out.println(s2.summary());
    System.out.println("Teacher: " + teacher.name + ", " + teacher.degree);
  }
}

Key tips and checks:

  • Either call existing parameterized constructors with correct args or add a no-arg constructor if you really need new Student().
  • When creating a Course, pass Student/Teacher objects (or change the Course constructor to accept primitives if that was intended).
  • Use 1234567890L for long literals (phone numbers) and single quotes for char.
  • After fixing construction, printDetails() can remain parameterless and read the instance fields; that is the usual and simplest design.

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Member Avatar for NormR1

code is giving error

Please post the full text of the error message.

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