HashMap in Java

import java.util.HashMap;
import java.util.Map;

class BookStore{

int bookId,quantity;
String bookName,author,publisher;

public BookStore(int bookId, int quantity,String bookName, String author, String publisher) {

this.bookId = bookId;
this.bookName = bookName;
this.author = author;
this.publisher = publisher;
this.quantity = quantity;
}

}

public class HashMapTest {

public static void main(String[] args) {

//Create map
Map<Integer, BookStore> bookMap = new HashMap<Integer, BookStore>();

//Create book
BookStore bookStore1 = new BookStore(111, 5, "Java Programming language", "ABCD", "ABCD");
BookStore bookStore2 = new BookStore(112, 10, "Ruby Programming language", "AABB", "ACCD");

bookMap.put(1, bookStore1);
bookMap.put(2, bookStore2);

for (Map.Entry<Integer, BookStore> entry:bookMap.entrySet()) {
int key = entry.getKey();
BookStore bookStore = entry.getValue();
System.out.println(key +" Details: ");
System.out.println(bookStore.bookId+" "+bookStore.bookName+" "+bookStore.author+" "
+bookStore.publisher+" "+bookStore.quantity);

}


}
}

View Source Code

মন্তব্যসমূহ

একটি মন্তব্য পোস্ট করুন

Popular Posts

Simple 2D hut design in computer graphics using c++

ছবি
/*Faisal Porag স্বপ্নের প্রতিবিম্ব... */ Source Code: #include <GL/glut.h> void display(void) { /* clear all pixels */ glClear(GL_COLOR_BUFFER_BIT); /* draw white polygon (rectangle) with corners at * (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0) */ glColor3f(0.0, 1.0, 0.0); //glBegin(GL_POLYGON); //glBegin(GL_POINTS); //glBegin(GL_LINES); //glBegin(GL_TRIANGLES); /* glVertex3f(0.25, 0.25, 0.0); glVertex3f(0.75, 0.25, 0.0); glVertex3f(0.75, 0.75, 0.0); glVertex3f(0.25, 0.75, 0.0); */ /* glVertex3f(0.25, 0.25, 0.0); glVertex3f(0.25, 0.75, 0.0); glVertex3f(0.75, 0.25, 0.0); glVertex3f(0.75, 0.75, 0.0); */ //code for one single line /*glVertex3f(0.25, 0.25, 0.0);//starting point glVertex3f(0.75, 0.25, 0.0);//Ending point //code for one single line glVertex3f(0.25, 0.25, 0.0);//starting point glVertex3f(0.50, 0.75, 0.0);//Ending point //code for one single line glVertex3f(0.50, 0.75, 0.0);//starting point glVertex3f(0.75, 0.25, 0.0);//Ending p
পড়তে থাকুন
প্রশ্ন : আমরা কি জাভা main method কে overload করতে পারি ? উত্তর : হ্যা পারি । আমরা জাভা method overloading ব্যাবহার করে class এর মধ্যে অনেক গুলা main method লিখতে পারি । কিন্তু জাভা ভার্চুয়াল মেশিন (JVM) সেই main method টাকে ই call করে যার আর্গুমেন্ট হিসেবে স্ট্রিং টাইপের এরে থাকে । তো চলুন দেরি  না  করে  আমরা একটি ছোট উদাহরণ দেখি main method overloading এর -     public class MainMethodOverLoadding { public static void main(String[] args) { System.out.println("Main Method Called Which is with String array"); } public static void main(String args) { System.out.println("Hello World - string type"); } public static void main(int args) { System.out.println("Integer Type"); } public static void main() { System.out.println("No argument "); } } /**  * Note :You can have any number of main methods in a class by method overloading. But JVM calls main() method which receives string array as arg
পড়তে থাকুন