In this post, with an example I will show how to use Function functional interface. Function interface is a functional interface that takes an input and produces an output. This is achieved by its “apply” method. Below is an example Main Code 1 package function; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 import java.util.function.Function;…… Continue reading Function functional interface
Tag: Java
Exploring jar files programmatically
In this post under java, I will show how to browse a jar file programmatically. For the example I will browse the mockito jar file. So I will add the “mockito-core-2.11.0.jar” in the classpath of the java file. Below is the complete code for browsing the jar file programmatically Main Code 1 package jar; 2…… Continue reading Exploring jar files programmatically
Parsing xml document using DOM api
In this post I will explain how to parse a xml document using DOM api. The DOM api can also be used to create xml documents in addition to reading. The DOM compliant parser loads the entire document in memory for reading it. Once the entire xml document is loaded in the memory, we can…… Continue reading Parsing xml document using DOM api
Sorting a section of an array
In this post I will explain how to sort a section of an array. The java Arrays class provides a static method named “sort” which takes the below three arguments 1) the array 2) fromIndex 3) toIndex This method sorts a section of the array. The section to be sorted is indicated by fromIndex (position…… Continue reading Sorting a section of an array
Combining two or more Consumer Functional Interface
In this post I will explain how to combine two or more Consumer Functional interface implementations. Consumer Functional interface has a default method “andThen”, which combines two Consumer Functional interface implementations. The method signature is as shown below default Consumer andThen(Consumer after) The way two Consumer implementations are combined using “andThen” method is as shown…… Continue reading Combining two or more Consumer Functional Interface
Sorting arrays using Comparator
This post explains how to sort arrays using comparator with an example. The java jdk provides Arrays class, which has a static method named “sort”. This method takes two arguments 1) the array to be sorted 2) Comparator which contains the logic to sort the array Below is the example which sort cards based on…… Continue reading Sorting arrays using Comparator
Creating array dynamically
In this post I will explain how to create array dynamically with an example. This is useful when we don’t know the type of array until runtime. Main code 1 package reflection; 2 3 import java.lang.reflect.Array; 4 5 public class ArraysDemo { 6 public static void main(String[] args) { 7 //Creating single dimension array 8…… Continue reading Creating array dynamically
Creating a temporary file and directory
The post shows you how to create a temporary file and directory in java with an example. Main Code 1 package nio; 2 3 import java.io.IOException; 4 import java.nio.file.Files; 5 import java.nio.file.Path; 6 import java.nio.file.Paths; 7 8 public class Example1 { 9 public static void main(String[] args) throws IOException { 10 Path path = Files.createTempFile(“prefix”,…… Continue reading Creating a temporary file and directory
Logging to database using java logging framework
This post explains how to log messages to the database. Create a table with below schema CREATE TABLE logging ( loggername VARCHAR(50) NULL DEFAULT NULL, threadId INT(11) NULL DEFAULT NULL, loglevel VARCHAR(50) NULL DEFAULT NULL, logmessage VARCHAR(50) NULL DEFAULT NULL ) Create a custom handler which will log the message to the database. In our…… Continue reading Logging to database using java logging framework
Setting Filter at Logger level
In the post “Setting Filter at Handler level”, I showed how to set filter at handler level. In this post I will explain how to set filter at logger level. An use case of setting filter at logger level, is restricting logging of messages based on the user who logged it. Custom Filter 1 package…… Continue reading Setting Filter at Logger level
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