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How-to articles, tricks, and solutions about JAVA

Create a directory if it does not exist and then create the files in that directory as well

To create a directory in Java if it does not exist, you can use the java.nio.file.Files class and its createDirectory method.

java java-io

How do I do a HTTP GET in Java?

To send an HTTP GET request in Java, you can use the java.net.URL and java.net.HttpURLConnection classes.

java http get httpurlconnection

In java how to get substring from a string till a character c?

To get a substring from a string in Java up until a certain character, you can use the indexOf method to find the index of the character and then use the substring method to extract the substring.

java

C++ performance vs. Java/C#

C++ is generally considered to be a faster and more performant language than Java or C#.

java performance c++ c# bytecode

Getting java.net.SocketTimeoutException: Connection timed out in android

The java.net.SocketTimeoutException: Connection timed out error usually occurs when a client is trying to connect to a server, but the connection request is taking too long to complete.

java android java-io httpurlconnection

Returning Arrays in Java

To return an array in Java, you can simply specify the array type as the return type of the method.

java

Can I add jars to Maven 2 build classpath without installing them?

Yes, you can add jars to the Maven build classpath without installing them.

java maven-2

Accept server's self-signed ssl certificate in Java client

To accept a server's self-signed SSL certificate in a Java client, you can create a custom javax.net.ssl.X509TrustManager and use it to override the default trust manager.

java ssl keytool https

Java: Get month Integer from Date

To get the month integer from a java.util.Date object in Java, you can use the getMonth() method of the java.util.Calendar class.

java date calendar

Parsing JSON Object in Java

To parse a JSON object in Java, you can use the org.json library.

json java