Need to add multiple values to a key in a Java HashMap but can't figure out how to do it? Here are three examples of how to solve the multiple values per key problem in Java.

This post shows readers how to create an array in Java. Including: Array Lists, multidimensional arrays, maps, and more.

This latest version of Java, due to arrive as a production release on September 16, has 18 features. JDK 25 comes on the heels of JDK 24, a six-month-support release that arrived March 18.