在Java8中对java.util.Comparator 和 Map.Entry 增加了新的方法用来排序。可以对HashMap, HashSet, HashTable, LinkedHashMap, TreeMap, 甚至ConcurrentHashMap都可以排序。基本思路就是先拿到集合，可以用entrySet()方法得到。然后调用stream方法，里面就可以调用sort方法了。对Map的排序，一般涉及两种，一是针对key，另外一种是针对value进行排序.对key的排序比较简单，这里主要介绍对Value的排序。

Date: 2017-09-13 View: 1520

In this tutorial, we will show you how to convert a String to java.util.Date. Many Java beginners are stuck in the Date conversion, hope this summary guide will helps you in some ways.

Date: 2019-08-18 View: 1520

Just upgraded to Java 8, and the Tomcat 7 keeps prompting the following exceptions:

Date: 2019-08-17 View: 1520

Java 8 Lambda : Comparator example

In this example, we will show you how to use Java 8 Lambda expression to write a Comparator to sort a List.

Date: 2019-08-17 View: 1520

Java Generate random integers in a range

In this article, we will show you three ways to generate random integers in a range.

Date: 2019-08-17 View: 1520

In this article, we will show you how to loop a List and a Map with the new Java 8 forEach statement.

Date: 2019-08-17 View: 1520

In Java 8, you can use Files.lines to read file as Stream.

Date: 2019-08-17 View: 1520

How to Install Oracle JDK 8 On Debian

In this tutorial, we will show you how to install Oracle JDK 8 On Debian, manually.

Date: 2019-08-17 View: 1520

In this article, we will show you a few ways to join a Java Array.

Date: 2019-08-17 View: 1520

In this article, we will show you a few StringJoiner examples to join String.

Date: 2019-08-17 View: 1520

In this tutorial, we will show you few Java 8 examples to demonstrate the use of Streams filter(), collect(), findAny() and orElse()

Date: 2019-08-17 View: 1520

Few Java examples to show you how to filter a Map with Java 8 stream API.

Date: 2019-08-17 View: 1520

In this article, we will show you how to use Java 8 Stream Collectors to group by, count, sum and sort a List.

Date: 2019-08-17 View: 1520

In Java 8, Stream cannot be reused, once it is consumed or used, the stream will be closed.

Date: 2019-08-17 View: 1520

In Java 8, you can either use Arrays.stream or Stream.of to convert an Array into a Stream.

Date: 2019-08-17 View: 1520