11,951 total views
11,951 total views In this article, we will discuss how to send an Email using Java Mail. Spring Boot is used to setup dependencies. This code can be used to send mail to any Email server or relay server including Gmail (as a standalone application). POM configurations: spring-boot-starter-mail contains all the basic jars required for this …
3,817 total views
3,817 total views In this post, we will setup C/C++ compiler in Eclipse in Windows and build and run and program. Install ‘MinGW GCC’ C/C++ compiler Download minGW from https://sourceforge.net/projects/mingw-w64 Install exe. In Eclipse ‘Windows -> Preferences -> C/C++ -> Build -> Environment’, add the following property. MINGW_HOME E.g of path: D:ApplnsminGWmingw64 Bin folder should be within …
Setup C/C++ in Eclipse in Windows using MinGW GCC Read More »
2,726 total views
2,726 total views In this post, Gson library is used to serialize data in JSON format to Java object and deserialize it back. Gson is an open source java library created by Google. Nulls are omitted from the JSON output. – toJson() is used to serialize an object to JSON format gson.toJson( object ); – …
Convert from JSON format to Java object and vice versa Read More »
1,521 total views
1,521 total views Data can be read from a file, or written to a file in following ways:– File read using Files.lines method– File read using Files.readAllLines method– File read using Files.readAllBytes method– Write bytes or multiple lines using Files.writeFile method– Lock file for write Example 1: File read using Files.lines method Files.lines method reads all …
2,381 total views
2,381 total views This post covers the following topics on search and filter:– Search for a sub string or char in a string– Search for a string in a list– Filter a string in a list– Filter a sub string in a list– Search for a string in an array Example 1: Search for a sub …
Search / filter for a string or char in a string, list, and array in Java Read More »
1,573 total views
1,573 total views StackOverflowError is a runtime error in Java which most developers would have seen atleast once. This error occurs most often due to deep recursive method call bug in your code. So the solution is to fix the bug. Stack is based on LIFO (Last In First Out) data structure. Each thread has its …
StackOverflowError example in Java, why they occur, and how to fix it Read More »
2,319 total views
2,319 total views In this post, we will see various ways to compress and un-compress String:– Compress and decompress data.– Write string to zip file, and read contents from the same file.– Write string to gz file, and read contents from the same file.All classes mentioned here uses deflate lossless compression algorithm. Difference in compressed data …
Compress string (and create file) and decompress it back in Java Read More »
2,514 total views
2,514 total views There are two ways to implement a thread in java:– By implementing Runnable interface– By extending Thread classIn Java only one class can be extended and hence using Runnable interface is suitable in most cases. Multiple threads can be run at the same time to run tasks in parallel and save time.Note: Be …
Multithreading example in Java using Runnable interface / Thread class Read More »
1,958 total views
1,958 total views In this article we will learn how to create user defined exceptions (checked and unchecked), and why and when to use it. Custom exceptions are useful:– To transform an exception and give the user a proper user readable error.– To group similar exceptions. Say you can group business errors into BUS_ERR_XX error code, …
Custom checked and unchecked exception example in Java Read More »
3,560 total views
3,560 total views In this article the following uses of Enum is mentioned: – Simple enum – Enums with multiple values – Convert enums to String, String[], List – Convert String to enum – Get enum values – Overloaded enum constructors Example 1: Simple enum This enum contains 3 fil type constants, and a default constuctor …
Enum – Common uses in Java including multiple values, and conversions Read More »