Question

(JAVA NetBeans)

Write programs in java

Example 9.13~9.15

//Book.Java

public class Book {

private String title;
private String author;
private double price;

/**
* default constructor
*/
public Book() {
title = "";
author = "";
price = 0.0;
}

/**
* overloaded constructor
*
* @param newTitle the value to assign to title
* @param newAuthor the value to assign to author
* @param newPrice the value to assign to price
*/
public Book(String newTitle, String newAuthor, double newPrice) {
title = newTitle;
author = newAuthor;
price = newPrice;
}

/**
* getTitle method
*
* @return the title
*/
public String getTitle() {
return title;
}

/**
* getAuthor method
*
* @return the author
*/
public String getAuthor() {
return author;
}

/**
* getPrice method
*
* @return the price
*/
public double getPrice() {
return price;
}

/**
* toString
*
* @return title, author, and price
*/
public String toString() {
return ("title: " + title + "\t"
+ "author: " + author + "\t"
+ "price: " + price);
}
}

======================================================================================

//BookSearchEngine.java

import java.util.ArrayList;
import javax.swing.JOptionPane;

public class BookSearchEngine {

public static void main(String[] args) {
BookStore bs = new BookStore();
String keyword = JOptionPane.showInputDialog(null,
"Enter a keyword");
System.out.println("Our book collection is:");
System.out.println(bs.toString());

ArrayList results = bs.searchForTitle(keyword);

System.out.println("The search results for " + keyword
+ " are:");
for (Book tempBook : results) {
System.out.println(tempBook.toString());
}
}
}

======================================================================================

//BookStore.java

import java.util.ArrayList;

public class BookStore {

private ArrayList library;

/**
* default constructor instantiates ArrayList of Books
*/
public BookStore() {
library = new ArrayList();
library.add(new Book("Intro to Java", "James", 56.99));
library.add(new Book("Advanced Java", "Green", 65.99));
library.add(new Book("Java Servlets", "Brown", 75.99));
library.add(new Book("Intro to HTML", "James", 29.49));
library.add(new Book("Intro to Flash", "James", 34.99));
library.add(new Book("Advanced HTML", "Green", 56.99));
library.trimToSize();
}

/**
* toString
*
* @return each book in library, one per line
*/
public String toString() {
String result = "";
for (Book tempBook : library) {
result += tempBook.toString() + "\n";
}
return result;
}

/**
* Generates list of books containing searchString
*
* @param searchString the keyword to search for
* @return the ArrayList of books containing the keyword
*/
public ArrayList searchForTitle(String searchString) {
ArrayList searchResult = new ArrayList();
for (Book currentBook : library) {
if ((currentBook.getTitle()).indexOf(searchString) != -1) {
searchResult.add(currentBook);
}
}
searchResult.trimToSize();
return searchResult;
}
}

2. Modify the examples 9.13-9.15 to process the students' data. Student.java /l/name, department, reg no School.java. StudentSearchEngine.java /lone can search student by name or department or reg no DBookSearch Engine.java X Bookjava 1eimport java.util.ArrayList; 2 import javax.swing.Joption Pane ; BookStore.java SECOND EDITION 3 ava 4 public class BookSearchEngine 5 { 6e public static void main String args ) 輸入 7 BookStore bs new BookStore (); String keyword JoptionPane. showInputDialog ( null, 8 Enter a keyword ? Java 10 "Enter a keyword" ); 確定 取消 11 System.out.println( "Our book collection is:"); System.out.println( bs.toString ); 12 13 ArrayList results bs.searchForTitle keyword ); 14 System.out.println "The search results for " keyword are:"); 16 17 + for Book tempBook: results 18 System.out. println ( tempBook.tostring (); 19 20 bur book collection is: title: Intro to Java title: Advanced Java title: Java Servlets title: Intro to HTML title: Intro to Flash title: Advanced HTML 21 author: James price: 56.99 price: 65.99 price: 75.99 price: 29.49 price: 34.99 price: 56.99 22 author: Green author Brown author: James author: James author: Green The search results for Java are title: Intro to Java title: Advanced Java title: Java Servlets price: 56.99 price: 65.99 price: 75.99 author: James author: Green author: Brown 61 ett Publishers, Inc. (www.jbpub.com)

Answer 1

Thanks for the question.

Here is the completed code for this problem.  Let me know if you have any doubts or if you need anything to change.

Thank You !!

================================================================================================

public class Student {

    private String studentName;
    private String departmentName;
    private int registrationNumber;


    public Student() {
        studentName=departmentName="";
        registrationNumber=0;
    }

    public Student(String studentName, String departmentName, int registrationNumber) {
        this.studentName = studentName;
        this.departmentName = departmentName;
        this.registrationNumber = registrationNumber;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public String getDepartmentName() {
        return departmentName;
    }

    public void setDepartmentName(String departmentName) {
        this.departmentName = departmentName;
    }

    public int getRegistrationNumber() {
        return registrationNumber;
    }

    public void setRegistrationNumber(int registrationNumber) {
        this.registrationNumber = registrationNumber;
    }

    @Override
    public String toString() {
        return 
                "Student Name: " + studentName + 
                ", Department Name: " + departmentName + 
                ", Registration No: " + registrationNumber ;
                
    }
    
    
}

======================================================================================

import java.util.ArrayList;

public class School {

    private ArrayList<Student> students;

    public School() {
        students = new ArrayList<Student>();
    }

    public void addStudent(Student aStudent) {
        students.add(aStudent);
    }

    

@Override
public String toString() {
    StringBuffer studentInformation = new StringBuffer();
    for(Student student:students){
        studentInformation.append(student).append("\n");
    }
    return studentInformation.toString();
}

}

======================================================================================

import java.util.ArrayList;

public class StudentSearchEngine {

    // method that takes in a name and returns
    // an array list of all students having the same name
    public static ArrayList<Student> searchByName(ArrayList<Student> students, String studentName) {
        ArrayList<Student> sameNameList = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getStudentName().equalsIgnoreCase(studentName)) {
                sameNameList.add(student);
            }
        }
        return sameNameList;
    }

    // method that takes in a department name and returns
    // an array list of all students having the same department name
    public static  ArrayList<Student> searchByDepartment(ArrayList<Student> students, String department) {
        ArrayList<Student> sameDepartmentList = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getDepartmentName().equalsIgnoreCase(department)) {
                sameDepartmentList.add(student);
            }
        }
        return sameDepartmentList;
    }

    // method that takes in a registration number and returns
    // an array list of all students having the same registration number
    public static ArrayList<Student> searchByRegistration(ArrayList<Student> students, int registration) {
        ArrayList<Student> sameRegistrationList = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getRegistrationNumber() == registration) {
                sameRegistrationList.add(student);
            }
        }
        return sameRegistrationList;
    }
}

=========================================================================================

Answer 2

Solution :

Java classes are given below :

1) Student.java :

// Student.java
public class Student{
private String name, department, reg_no;
Student(){
name = "";
department = "";
reg_no = "";
}

Student(String n, String d, String r){
name = n;
department = d;
reg_no = r;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getDepartment() {
return department;
}

public void setDepartment(String department) {
this.department = department;
}

public String getReg_no() {
return reg_no;
}

public void setReg_no(String reg_no) {
this.reg_no = reg_no;
}

public String toString(){
String result = "";
result = "Name : " + name + ", Department : "+ department + ", Registration number : "+ reg_no;
return result;
}
  
}

2) School.java :

import java.util.ArrayList;

public class School{
private ArrayList<Student> students;

public School(){
students = new ArrayList<Student>();
students.add(new Student("student1", "computer science", "111AAA"));
students.add(new Student("student2", "environment science", "222AAA"));
students.add(new Student("student3", "mechanical engineering", "333AAA"));
students.add(new Student("student4", "psychology", "444AAA"));
students.add(new Student("student5", "computer science", "555AAA"));
students.add(new Student("student6", "computer science", "666AAA"));
students.add(new Student("student7", "psychocoly", "777AAA"));
students.add(new Student("student8", "environment science", "888AAA"));
students.add(new Student("student9", "mechanical engineering", "999AAA"));
students.add(new Student("student10", "computer science", "111BBB"));
}

public String toString(){
String result = "";
for(int i=0; i<students.size(); i++){
Student student = students.get(i);
result = result + student.toString() + "\n";
}
return result;
}

public ArrayList searchForName(String searchString){
ArrayList searchResult = new ArrayList<>();
for(int i=0; i<students.size(); i++){
Student student = students.get(i);
if((student.getName()).toLowerCase().indexOf(searchString.toLowerCase()) != -1){
searchResult.add(student);
}
}
return searchResult;
}

public ArrayList searchForDepartment(String searchString){
ArrayList searchResult = new ArrayList<>();
for(int i=0; i<students.size(); i++){
Student student = students.get(i);
if((student.getDepartment()).toLowerCase().indexOf(searchString.toLowerCase()) != -1){
searchResult.add(student);
}
}
return searchResult;
}

public ArrayList searchForRegNo(String searchString){
ArrayList searchResult = new ArrayList<>();
for(int i=0; i<students.size(); i++){
Student student = students.get(i);
if((student.getReg_no()).toLowerCase().indexOf(searchString.toLowerCase()) != -1){
searchResult.add(student);
}
}
return searchResult;
}
}

3) StudentSearchEngine.java :

import java.util.ArrayList;
import javax.swing.JOptionPane;
public class StudentSearchEngine {
public static void main(String[] args) {
School school = new School();
int flag = 0;
int choice;
while(flag == 0){
choice = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter your search criteria(1 for name, 2 for department, 3 for registration number, 4 for exit) : "));
if(choice == 1){
String keyword = JOptionPane.showInputDialog(null,"Enter a keyword");
System.out.println("Students in school :");
System.out.println(school.toString());
ArrayList<Student> results = school.searchForName(keyword);
System.out.println("The search results for name for keyword " + keyword+ " are:");
for (Student student : results) {
System.out.println(student.toString());
}
System.out.println();
}
else if(choice == 2){
String keyword = JOptionPane.showInputDialog(null,"Enter a keyword");
System.out.println("Students in school :");
System.out.println(school.toString());
ArrayList<Student> results = school.searchForDepartment(keyword);
System.out.println("The search results for Department for keyword " + keyword+ " are:");
for (Student student : results) {
System.out.println(student.toString());
}
System.out.println();
}
else if(choice == 3){
String keyword = JOptionPane.showInputDialog(null,"Enter a keyword");
System.out.println("Students in school :");
System.out.println(school.toString());
ArrayList<Student> results = school.searchForRegNo(keyword);
System.out.println("The search results for registration number for keyword " + keyword+ " are:");
for (Student student : results) {
System.out.println(student.toString());
}
System.out.println();
}
else if(choice == 4){
flag = 1;
}
else{
System.out.println("Invalid input. Please try again. ");
}
}
  
}
}

Sample outputs :

Input X Enter your search criteria(1 for name, 2 for department, 3 for registration number, 4 for exit) OK Cancel

Input X Enter a keyword ? BBE OK Cancel

Students in school student1, Department computer science, Registration number 111AAA environment science, Registration number 222AAA Name student3, Department mechanical engineering, Registration number : 333AAA Name Name student2, Department : psychology, Registration number 444AAA computer science, Registration number : Name student4, Department student5, Department Name 555AAA student6, Department computer science, Registration number 666AAA psychocoly, Registration number 777AAA Name Name student7, Department student8, Department: environment science, Registration number : 888AAA Name student9, Department mechanical engineering, Registration number :999AAA Name student10, Department : computer science, Registration number : 111BBB Name The search results for registration number for keyword BBB are: student10, Department: computer science, Registration number : 111BBB Name

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