Assignment-1 Final Code. Student.java

Transcription

1 package com.ds.assgn1a; public class Student { public int rollno; public String name; public double marks; Assignment-1 Final Code Student.java public Student(int rollno, String name, double marks){ this.rollno = rollno; this.name = name; this.marks = public String tostring() { return "Student [rollno=" + rollno + ", name=" + name + ", marks=" + marks + "]"; Teacher.java

2 package com.ds.assgn1a; import java.util.arraylist; import java.util.enumeration; import java.util.scanner; import java.util.vector; public class Teacher { /*static Vector studentdb =new Vector();*/ static ArrayList<Student> studentdb = new ArrayList<Student>(); public static void main(string args[]) { Scanner sc = new Scanner(System.in); Operations obj = new Operations(); int rollno; Student s; while(true){ System.out.println(""); System.out.println(""); System.out.println(""); System.out.println("3. Search Student"); System.out.println(""); System.out.println(""); System.out.println(" "); int ch; ch = sc.nextint(); switch(ch){ case 1: s = obj.addstudent(); if(s!= null){ studentdb.add(s); System.out.println("Student added successfully!!!"); case 2:

3 System.out.println("Enter rollno to be deleted: "); rollno = sc.nextint(); boolean deleted = obj.deletestudent(rollno); if(deleted){ System.out.println("Roll no " + rollno + " deleted successfully!!!"); System.out.println("After Deletion updated list is - "); obj.display(studentdb); case 3: System.out.println("Enter rollno to be searched: "); rollno = sc.nextint(); s = obj.searchstudent(rollno); if(s == null){ System.out.println("Roll No " + rollno + " not found"); else{ System.out.println(s); case 4: System.out.println("Enter passing marks: "); double pm = sc.nextdouble(); /*Vector v = obj.failedstudents(pm);*/ ArrayList<Student> v= obj.failedstudents(pm); System.out.println("Failed Student's list -> "); obj.display(v);

4 if(ch == 5){ System.out.println("Bye Bye!!!"); sc.close(); class Operations{ void display(arraylist<student> v){ /*Enumeration e = v.elements(); while(e.hasmoreelements()){ System.out.println("" + (Student)e.nextElement()); */ for(student s : v) { System.out.println(s); Student addstudent(){ Scanner sc = new Scanner(System.in); System.out.println("RollNo: "); int rollno = sc.nextint(); System.out.println("Name: "); String name = sc.next(); System.out.println("Marks: "); double marks = sc.nextdouble();

5 Student obj = new Student(rollNo, name, marks); return obj; boolean deletestudent(int rollno){ /*Enumeration e = Teacher.studentDb.elements();*/ boolean status = false; for(student s :Teacher.studentDb) { if(s.rollno == rollno){ int index = Teacher.studentDb.indexOf(s); Teacher.studentDb.remove(index); status = true; /*while(e.hasmoreelements()){ Student s = (Student) e.nextelement(); if(s.rollno == rollno){ int index = Teacher.studentDb.indexOf(s); Teacher.studentDb.remove(index); status = true; */ return status; Student searchstudent(int rollno){ Student st = null; for (Student s: Teacher.studentDb) { if(s.rollno == rollno){ st=s;

6 /*Enumeration e = Teacher.studentDb.elements();*/ /*while(e.hasmoreelements()){ st = (Student) e.nextelement(); if(st.rollno == rollno){ */ return st; ArrayList<Student> failedstudents(double pm){ /*Vector v = new Vector();*/ ArrayList<Student> v = new ArrayList<Student>(); /*Enumeration e = Teacher.studentDb.elements(); while(e.hasmoreelements()){ Student st = (Student) e.nextelement(); if(st.marks < pm){ v.add(st); */ for(student s : Teacher.studentDb) { if(s.marks < pm){ v.add(s); return v;

7 //******************************************************** Output Running Steps:- 1. Run Teacher.java Code 3. Search Student 1 RollNo: 63 Name: dinesh Marks: 90 Student added successfully!!!

8 3. Search Student 1 RollNo: 20 Name: ddd Marks: 30 Student added successfully!!! 3. Search Student 1 RollNo:

9 11 Name: sss Marks: 95 Student added successfully!!! 3. Search Student 2 Enter rollno to be deleted: 11 Roll no 11 deleted successfully!!! After Deletion updated list is - Student [rollno=63, name=dinesh, marks=90.0] Student [rollno=20, name=ddd, marks=30.0]

10 3. Search Student 3 Enter rollno to be searched: 20 Student [rollno=20, name=ddd, marks=30.0] 3. Search Student 4 Enter passing marks: 40 Failed Student's list -> Student [rollno=20, name=ddd, marks=30.0]

11 3. Search Student 5 Bye Bye!!! /*