This post explains java logging with simple example. Main code 1 package Logging; 2 3 import java.io.IOException; 4 import java.util.logging.Logger; 5 6 public class LoggingDemo1 { 7 public static void main(String[] args) throws IOException { 8 Logger logger = Logger.getLogger(“logger1”); 9 logger.info(“Hello my name is Mathew”); 10 logger.warning(“Hello my name is Mathew”); 11 logger.config(“Hello my…… Continue reading Java logging simple example
Category: Java
Decompressing JAR file
JAR file is file archiver which collects/groups different files and folder into a format which represents one file. The format of JAR file is an uncompressed format. Pack200 is a tool that can be used to compress and decompress a jar file. Below is a simple example of how we can use Pack200 tool to…… Continue reading Decompressing JAR file
Compressing JAR file
JAR file is file archiver which collects/groups different files and folder into a format which represents one file. The format of JAR file is an uncompressed format. Pack200 is a tool that can be used to compress jar file. Below is a simple example of how we can use Pack200 tool to compress the file…… Continue reading Compressing JAR file
Default Interface Example
Java 8 introduces a new feature called Default Interface. This feature allows interface creator to provide default implementations for methods, so that concrete classes that implementing the interface don’t have to provide implementations for those methods. The below code gives you an example of how to create default interface and how to use them. Interface…… Continue reading Default Interface Example
Creating a file archiver in zip format
This post explains how to create file archiver in WinZip format. WinZip is a file archiver and compression tool. Whenever a zip file is created by default the file is compressed and archived together in a single file. We can change the default behaviour (i.e., compression) by setting the level property in ZipOutputStream. The below…… Continue reading Creating a file archiver in zip format
Creating a zip file of a folder with CRC32 checksum
This post explains how to create a zip file of a folder (also containing sub folders) with CRC32 checksum. The below code is similar to the previous post “Creating zip file of a folder” with minor change in main method. The main method code snippet from the previous post as shown below File folder =…… Continue reading Creating a zip file of a folder with CRC32 checksum
Combining Predicates
This post explains how we can combine two or more predicates using logical operations as mentioned below 1) and 2) or 3) negate Below is an example Person package Function; public class Person { private String ssn; private String fname; private String lname; private String description; private int age; public String getSsn() { return ssn;…… Continue reading Combining Predicates
Java Predicate
Java provides a new interface named Predicate which is a functional interface. A functional interface is an interface which will have exactly one abstract method in addition to one or more default methods. In the case of Predicate interface, the abstract method is test method whose signature is as shown below boolean test(T t) In…… Continue reading Java Predicate
Getting access to all printers configured in machine
This post explains how to programmatically get access to all printers configured in a machine. Java provides lookup facitlity through PrintServiceLookup class. This class has static methods through which we can get a reference to all the printers. We use the lookupPrintServices method in the PrintServiceLookup class. The api definition is as shown below public…… Continue reading Getting access to all printers configured in machine
Getting access to default printer
This post explains how to programmatically get access to a printer configured as default printer in a machine. Java provides PrintServiceLookup class, which provides static methods through which we can get a reference to the printer. Each printer installed in a machine is represented by an instance of PrintService interface. The PrintService interface provides methods…… Continue reading Getting access to default printer
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