Category Archives: Core Java

We will discuss commonly asked questions related to java 8 , exception handling, string operations, java io etc.

Create object/instance of class by name using Class.forName in java (examples)

Given an application in java. We would like to create the instance of classes by specifying class name. Instances of the class Class represent classes and interfaces in a running Java application. We will get the reference of loaded class using Class.forName(“Complete path of a class”) And then, we can create instance of loaded class. Class Class does… Read More »

Get & Set default timezone of java virtual machine (JVM) – example

We would like to get/set the default timezone in java. TimeZone represents a time zone offset, and also figures out daylight savings. We will use package java.util.TimeZone to get/set default time zone. 1. Important methods of TimeZone class 2. Program: Get & Set default timezone of java virtual machine (JVM) package org.learn; import java.util.TimeZone; public class DemoTimeZone… Read More »

Convert local file path to URL & URI in java (example)

Given a File in java. We would like to convert path of a file to URL & URI path. e.g. If path of file on local windows operating system is “D:\Code\Local File Path.txt” URL & URI of local file path will be “file:/D:/Code/Local%20File%20Path.txt” We will use toURL() and toURI() method of File class . 1.… Read More »

Create or Write property file in java (example)

Given a key value pairs of properties in java. We would like to create or write properties to property file We will use Properties class to set properties file. Procedure to create property file in java. Set properties using Properties class. properties.setProperty(“user.name”, “admin”); properties.setProperty(“user.age”, “25”); We will use store method of the Properties class, to… Read More »

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