Category: Java core

How to iterate a Map in Java

How to iterate a Map in Java

This tutorial shows several ways for iterating a Map in Java. 1- Entry Set The common way for iterating a Map in Java is through entrySet() method as the following:...

How to iterate a List in Java

How to iterate a List in Java

This tutorial shows several ways for iterating a List in Java. 1- Typical For loop Using a typical For loop, you can iterate a List as the following:

2-...

ArrayList vs Vector

ArrayList vs Vector

ArrayList and Vector collections are used interchangeably for storing several items with the same type inside the memory. In this tutorial, we list the major similarities and differences between these 2...

Hashtable VS HashMap

Hashtable VS HashMap

Hashing objects like HashMap and Hashtable are mostly used for storing and caching data as a key/value pairs inside the memory. In this tutorial, we list the major similarities and...

Java – Convert File to byte[]

Java – Convert File to byte[]

This tutorial shows several ways to convert a File object to a byte[] array in Java. 1- Traditional way The traditional conversion way is through using read() method of InputStream as...

Java – Convert byte[] to File

Java – Convert byte[] to File

This tutorial shows several ways to convert a byte[] array to File in Java. 1- Traditional way The traditional way of doing the conversion is through using FileOutputStream as the...

Convert JSON to Java Object

Convert JSON to Java Object

This tutorials shows 2 ways for converting a JSON string to a Java object. 1- Gson Gson is the most popular library for converting JSON string to Java objects. With Gson, you...

Convert Java object to JSON

Convert Java object to JSON

This tutorial shows 2 ways for converting Java objects to JSON. This kind of conversion is normally done via third-party libraries as it’s not supported by the JDK itself and...