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How to read contacts on Android 2.0
...in your projection; then you wouldn't have to do a messy simulated join in Java.
– Yoni Samlan
Dec 17 '10 at 16:28
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Differences in boolean operators: & vs && and | vs ||
...); // 6
Thanks to Carlos for pointing out the appropriate section in the Java Language Spec (15.22.1, 15.22.2) regarding the different behaviors of the operator based on its inputs.
Indeed when both inputs are boolean, the operators are considered the Boolean Logical Operators and behave similar...
Why do we need break after case statements?
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Java comes from C and that is the syntax from C.
There are times where you want multiple case statements to just have one execution path.
Below is a sample that will tell you how many days in a month.
class SwitchDemo2 {
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Error 908: Permission RECEIVE_SMS has been denied. - App Inventor 2 中...
...，则权限将包含在清单中，并且（如果Android >= 6.0）在运行时请求。
在此更改之前，ReceivingEnabled的默认值是Foreground，而不是Off。因此，旧的教程可能不起作用，因为它们假设了旧的行为。人们需要有意识地启用接收选项才能...
Does Java support default parameter values?
I came across some Java code that had the following structure:
24 Answers
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How to create a temporary directory/folder in Java?
...ere a standard and reliable way of creating a temporary directory inside a Java application? There's an entry in Java's issue database , which has a bit of code in the comments, but I wonder if there is a standard solution to be found in one of the usual libraries (Apache Commons etc.) ?
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Java Name Hiding: The Hard Way
...ble with same name. For more such interesting cases, I would recommend 2 "Java Pitfalls" books: books.google.co.in/books/about/… books.google.co.in/books/about/…
– RRM
Jul 28 '14 at 8:06
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How to convert a LocalDate to an Instant?
I work with the new DateTime API of Java 8.
2 Answers
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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...
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...