Creating a user diefind class and Printing its Data

 

public class Student {

int rollNo;

int marks;

String name;

public Student (int rollNo, int marks, String name){

this.rollNo=rollNo;

this.marks=marks;

this.name=name;

}

public String toString(){

return(rollNo+" "+marks+" "+name);

}

public boolean equals(Object obj){

if(obj instanceof Student){

Student s = (Student)obj;

return(this.rollNo==rollNo && this.marks==marks && this.name.equals(s.name));

}

return false;

}

}

import java.util.*;

public class Userdefined {

public static void main(String[] args) {

Student s1 = new Student(1,90,"Ajay");

Student s2 = new Student(2,56,"Vijay");

Student s3 = new Student(3,76,"Kiyan");

Student s4 = new Student(4,84,"Kayna");

//Creating an arraylist to store student objects

ArrayList<Student> st = new ArrayList<>();

st.add(s1);

st.add(s2);

st.add(s3);

st.add(s4);

Student s5 = new Student(3,76,"Kiyan");

System.out.println(st);

//comparing if Arraylist contains a specific data

System.out.println(st.contains(s5));

}

}