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1 Answer(s)      4 years and 11 months ago
Posted in : Java Beginners

public class Student{ private String name; private int studentId; //getter and setters } Write a method which accepts a Set of Student objects and returns a Map with Student Id as key and name as value.

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June 12, 2012 at 1:06 PM

Here comes an example that stores the student object into Set and display the data in the form of key value pair.

import java.util.*;

public class Student{ 
    public static Map displayData(){
    Set<Student> set=new HashSet<Student>();
    Scanner input=new Scanner(;
    for(int i=1;i<=5;i++){
    System.out.print("Enter ID: ");
    int id=input.nextInt();
    System.out.print("Enter Name: ");

    set.add(new Student(id,name));
    HashMap<Integer,String> map=new HashMap<Integer,String>();
    for(Student st:set){
    return map;

    private String name;
    private int studentId; 
    Student(int studentId,String name){
    public void setName(String name){;
    public String getName(){
        return name;

    public void setStudentId(int studentId){
    public int getStudentId(){
        return studentId;
    public static void main(String []args){
    Map map=displayData();
    Set set = map.entrySet();
    Iterator i = set.iterator();
    while(i.hasNext()) {
    Map.Entry me = (Map.Entry);
    System.out.print(me.getKey() + ": ");


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