Java
Do 72a, 72b, 72c, 72d. Code & output required.
Homework Answers
72a.
code:
import java.util.HashSet;
class Product{
// data members of class product
String name;
int price;
int quantity;
// parametrized constructor for initializing data
members
public Product(String name, int price, int quantity)
{
super();
this.name = name;
this.price = price;
this.quantity = quantity;
}
// setters and getters for data members
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
}
public class Tester {
public static void main(String[] args)
{
// TODO Auto-generated method
stub
// creating objects of class
product
Product product=new
Product("Chacolate",20,2);
Product product2=new
Product("FaceWash",50,1);
// creating HashSet of type
product
HashSet<Product> h=new
HashSet<Product>();
// checking if duplicate present or
not
if(h.contains(product)==false)
{
h.add(product);
}
if(h.contains(product2)==false)
{
h.add(product2);
}
if(h.contains(product)==false)
{
h.add(product);
}// printing out the contents of
HashSet
for(Product i:h) {
System.out.println("Name:"+i.name+" "+"Price:"+i.price+"
"+"Quantity:"+i.quantity);
}
}
}
output:
code screenshot:
![public class Tester { public static void main(String[] args) { // TODO Auto-generated method stub // creating objects of clas](http://img.homeworklib.com/questions/828c4810-0255-11eb-b125-050d2b34eacd.png?x-oss-process=image/resize,w_560)
72b.
code:
import java.util.HashMap;
import java.util.Set;
public class SeventyTwob {
public static void main(String[] args)
{
// creating HashMap with String and
Integer
HashMap<String,Integer> h=new
HashMap<String,Integer>();
// adding key,value pair to
HashMap
h.put("Barry",25);
h.put("Joe",45);
h.put("Catilin",23);
h.put("stark",40);
// set for storing keys of
HashMap
Set<String>
keys=h.keySet();
// enhanced for loop for printing
HashMap values
for(String key:keys) {
System.out.println(key+" "+h.get(key));
}
}
}
output:
code screenshot:
![import java.util.HashMap; import java.util.Set; public class SeventyTwob { public static void main(String[] args) { // creati](http://img.homeworklib.com/questions/83e687f0-0255-11eb-b690-c9d0592a5270.png?x-oss-process=image/resize,w_560)
72c.
code:
import java.util.HashMap;
import java.util.Set;
class Employee{
// data members of class Employee
private int id;
private String name;
private int sal;
// parametrized constructor to initialize data
members
public Employee(int id, String name, int sal) {
super();
this.id = id;
this.name = name;
this.sal = sal;
}
// setters and getters
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getSal() {
return sal;
}
public void setSal(int sal) {
this.sal = sal;
}
public static void main(String[] args) {
// creating object of employee
class
Employee employee=new
Employee(1,"barry",50000);
Employee employee1=new
Employee(2,"Catilin",30000);
Employee employee2=new
Employee(3,"West",43000);
Employee employee3=new
Employee(4,"Iris",35000);
Employee employee4=new
Employee(5,"joe",65000);
// creating HashMap with
Employee,Integer pair
HashMap<Employee,Integer>
hashMap=new HashMap<Employee,Integer>();
// checking duplicates present or
not
if(hashMap.containsKey(employee)==false) {
hashMap.put(employee,1);
}
if(hashMap.containsKey(employee1)==false) {
hashMap.put(employee1,2);
}
if(hashMap.containsKey(employee2)==false) {
hashMap.put(employee2,3);
}
if(hashMap.containsKey(employee3)==false) {
hashMap.put(employee3,4);
}
if(hashMap.containsKey(employee4)==false) {
hashMap.put(employee4,5);
}
// set for storing keys
Set<Employee>
keys=hashMap.keySet();
// iterating over each key and
printing its values
for(Employee key:keys) {
System.out.println(hashMap.get(key)+" "+"ID:"+key.id+" "+"Name:"+"
"+key.name+" "+"Salary:"+" "+key.sal);
}
}
}
output:
code screenshot:
![public static void main(String[] args) { // creating object of employee class Employee employee=new Employee(1, barry, 5000](http://img.homeworklib.com/questions/8523b960-0255-11eb-b62b-2b3cccb44ecd.png?x-oss-process=image/resize,w_560)
72d.
code:
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
public class SeventyTwoD {
public static void main(String[] args) {
// creating Map for sorting based
on key
Map<Integer,String> map=new
TreeMap<Integer, String>();
map.put(4, "Caty");
map.put(1, "barry");
map.put(3, "Joe");
// set for storing keys
Set<Integer>
keys=map.keySet();
// loop for iterating over
keys
for(Integer key:keys) {
System.out.println(key+" "+map.get(key));
}
}
}
output:
code screenshot:
Note:Check the code screenshot for indentation of code.
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