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JMS and AMQP - RabbitMQ
...e not a teacher :) ) Let's see all of these one by one.
As you know:
The Java Message Service (JMS) API is a Java Message Oriented Middleware (MOM) API for sending messages between two or more clients. JMS is a part of the Java Platform, Enterprise Edition, and is defined by a specification develo...
Any reason to prefer getClass() over instanceof when generating .equals()?
...iskov substitution principle, and can lead to very surprising behavior. In Java, it's particularly important because most of the collections (HashTable, etc.) are based on the equals method. If you put a member of the super class in a hash table as the key and then look it up using a subclass instan...
How to solve javax.net.ssl.SSLHandshakeException Error?
...ificate saved in a file, you need to add it to your JVM's trust store. At $JAVA_HOME/jre/lib/security/ for JREs or $JAVA_HOME/lib/security for JDKs, there's a file named cacerts, which comes with Java and contains the public certificates of the well-known Certifying Authorities. To import the new ce...
How find all unused classes in Intellij Idea?
...ar"
Double-click on "Unused declaration"
Settings will pop up
Click on Java/Declaration redundancy/Unused declaration
on the right bottom select "On the fly editor settings"
untick check fields, ..., check parameters. Only Check Classes should be ticked.
Press OK
Settings closes
On the menu ...
How to convert a LocalDate to an Instant?
I work with the new DateTime API of Java 8.
2 Answers
2
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Immutable class?
How can one make a Java class immutable, what is the need of immutability and is there any advantage to using this?
13 Answ...
Do fragments really need an empty constructor?
...k: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/Fragment.java
You will see the instantiate(..) method in the Fragment class calls the newInstance method:
public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) {
try {...
What is the purpose of flush() in Java streams?
In Java, flush() method is used in streams. But I don't understand what are all the purpose of using this method?
6 Answe...
Convert int to char in java
...ted by the value of 48.
We typed (a + '0') and in order to add these up, Java converted '0' to its ASCII value which is 48 and a is 1 so the sum is 49. Then what we did is:
(char)(49)
We casted int to char. ASCII equivalent of 49 is '1'. You can convert any digit to char this way and is smarter...
BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...E工作流程0x21 工作过程蓝牙适用于短距离无线通信，正常运行时传输距离为10m（低功耗模式下为100m），频段2.4Ghz。先进行三个蓝牙术语介绍：
配对:配对是指两个蓝牙设备首次通讯时，相互确认的过程。两个蓝牙设备之间一经...