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How-to articles, tricks, and solutions about JAVA

A Java collection of value pairs? (tuples?)

In Java, you can use the AbstractMap.SimpleEntry class from the java.util package to represent a value pair (also known as a tuple).

java

A KeyValuePair in Java

In Java, a KeyValuePair is a data structure that represents a pair of keys and values, similar to a Map.

java key-value

A quick and easy way to join array elements with a separator (the opposite of split) in Java

To join array elements with a separator in Java, you can use the join method from the String class.

java string arrays

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

Access restriction on class due to restriction on required library rt.jar?

If you are getting an "access restriction" error on a class in your Java code, it means that you are trying to access a class or member (field or method) that has restricted access.

java eclipse wsdl stub wsdl2java

accessing a variable from another class

To access a variable from another class in Java, you can use the following steps:

java variables

add an element to int [] array in java

To add an element to an array in Java, you can use one of the following methods:

java arrays

Add context path to Spring Boot application

To add a context path to a Spring Boot application, you can use the server.context-path property in the application's application.properties file.

java spring spring-mvc spring-boot

Add leading zeroes to number in Java?

To add leading zeroes to a number in Java, you can use the format method of the String class, along with a format string that specifies the desired length and padding character.

java

add string to String array

To add a string to a string array in Java, you can use the Arrays.copyOf() method to create a new array that is one element larger than the original array, and then use a loop to copy the elements of the original array into the new array. Here's an exampl

java