In this blog post we will talk and learn about one of the very important multi Threading Java interview question and question is that What is BlockingQueue? How can we implement Producer and Consumer problem using BlockingQueue? java.util.concurrent.BlockingQueue is a Queue that supports typically operations that wait for the queue to become non-empty when retrieving and… Read More »
In this post we will discuss about one of the basic java interview question and question is that How would you round a double value to certain decimal Precision and Scale ? First of all let us understand what’s the difference between Precision and Scale. Precision represent total number of digits (or significant digits) of a… Read More »
In this blog post we will talk and learn about one of very important java interview question and question is that What are the classes in java are immutable ? Classes in java are immutable All wrapper classes are immutable – Boolean , Character, Byte, Short, Integer,Long, Float, Double Java.lang.String class is also Immutable Immutable classes… Read More »
In this post we will talk and learn How would you print a given currency value for Indian Locale (INR Currency) in java? NumberFormat class is designed specifically for this purpose. Currency symbol & Rounding Mode is automatically set based on the locale using NumberFormat. Lets see an example..
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package com.kkjavatutorials.util; import java.text.NumberFormat; import java.util.Locale; /** * @author KK JavaTotorials *Utility Class to print currency amount in Indian Locate */ public class CurrencyUtil { private static final NumberFormat numberFormat = NumberFormat.getCurrencyInstance(new Locale("en","in")); /** * @param amout input * @return amount in string */ public static String formatMonetaryAmount(double amout) { numberFormat.setMinimumFractionDigits(2); numberFormat.setMaximumFractionDigits(4); return numberFormat.format(amout); } } |
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package com.kkjavatutorials.client; import java.math.BigDecimal; import com.kkjavatutorials.util.CurrencyUtil; /** * @author KK JavaTutorials * Java program to print a given currency value for Indian Locale (INR Currency)? */ public class PrintCurrencyAmout { public static void main(String[] args) { BigDecimal bigDecimal = new BigDecimal(22.1214984); System.out.println("Amount = " + CurrencyUtil.formatMonetaryAmount(bigDecimal.doubleValue())); } } |
Output:: Amount = Rs.22.1215 You… Read More »
In this post we will talk and learn Which data type would you choose for storing currency values like Trading Price ? What is your opinion about Float, Double and BigDecimal data types ? Let’s see how double data type works for financial calculation
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package com.kkjavatutorials.client; /** * @author KK JavaTutorials * Float & Double data types are Bad for financial world, never use them for monetary * calculations. */ public class DoubleForCurrencyTest_1 { public static void main(String[] args) { double total = 0.2; for (int i = 0; i < 100; i++) { total += 0.2; } System.out.println("Total Amount = " + total); } } |
Sample output of above program: Total Amount = 20.19999999999996 The… Read More »
In this blog post we will talk and learn about one of very important multi Threading Java interview question and question is that What do we understand by fair locks? A fair lock takes the waiting time of the threads into account when choosing the next thread that passes the barrier to some exclusive resource. An… Read More »
In this blog post we will talk and learn about one of very important multi Threading Java interview question and question is that Is it possible to check whether a thread holds a monitor lock on some given object? We have method in class java.lang.Thread which provides the static method Thread.holdsLock(Object) that returns true if and only if the current… Read More »
In this blog post we will talk and learn about one of very important java 8 interview question and question is that Explain Stream API introduced in Java 8 ? What is a Stream ? A stream can be define as a sequence of data elements supporting sequential and parallel aggregate operations. Example like computing the… Read More »
In this blog post we will talk about How many ways we can create an object in Java? We see there are 6 different ways to create an Object in Java. Method-1 We can create an Object using new keyword. This is the most common way to create an object in java and almost 99%… Read More »
In this post we will discuss about one of the basic java interview question and question is that What will this statement return 3*0.1 == 0.3? true or false? This is one of the really most tricky interview question in java. Only few developers answer this question and explain the concept correctly. The very short and… Read More »