Java Programming Tutorials

Java programming tutorials with many code examples!

Java 8 remove selected item from Collection

In Java 8 remove selected item from Collection? It can be done in at least two ways both of which we are going to implement here. Let’s code!

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Java 8 List to Map

Very common task is creation of Map from a List of objects. In this post we show how to use Java 8 to convert List to Map using Collectors.

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Java 8 forEach examples

In this article we present Java 8 forEach on examples. These are very convenient methods for use with Lambda Expressions and method references.

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Java Util Map merge(key, value, BiFunction)

java.util.Map.merge(key, value, BiFunction)

The method Map.merge(key, value, BiFunction) associates given value with the given key or calculates the new value from the old value and the given one using provided remapping function.

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Java Util Map getOrDefault

java.util.Map.getOrDefault(key, defaultValue)

The method Map.getOrDefault(key, defaultValue) returns mapped value for the given key or defaultValue if there is no such mapping.

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Java Util Map forEach(BiConsumer)

java.util.Map.forEach(BiConsumer)

The method Map.forEach(BiConsumer) performs the given action for each entry of the map until all are processed or exception is thrown.

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Java Util Map computeIfAbsent(key,Function)

java.util.Map.computeIfAbsent(key, Function)

The method Map.computeIfAbsent(key, Function) computes the new value and associates it with the key if there is no mapping for the given key or the mapping is null. Returns the new value associated with the key.

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Java PriorityQueue by example

Java PriorityQueue by example

In this tutorial we’re going to show how to use PriorityQueue to process queue elements in order of importance, not insertion.

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Java immutable List

Problem:

How to create an immutable List in Java? There are couple of ways to do that, one of them is to use Java Collections Framework as can be seen in the following example.

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