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Dump Mongo Collection into JSON format
...ay to dump mongo collection into json format? Either on the shell or using java driver.I am looking for the one with best performance.
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Why start an ArrayList with an initial capacity?
... post on the topic 2 months ago. The article is for C#'s List<T> but Java's ArrayList has a very similar implementation. Since ArrayList is implemented using a dynamic array, it increases in size on demand. So the reason for the capacity constructor is for optimisation purposes.
When one of t...
Finding all objects that have a given property inside a collection [duplicate]
...g memory reference locations, refer to: stackoverflow.com/questions/767372/java-string-equals-versus
– user785262
Jun 1 '12 at 20:14
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How to get the insert ID in JDBC?
...ord in a database (which is Microsoft SQL Server in my case) using JDBC in Java. At the same time, I want to obtain the insert ID. How can I achieve this using JDBC API?
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java.lang.IllegalStateException: The specified child already has a parent
I am using fragments, when I instantiate a fragment the first time it it. but the second time I got this exception. I couldn't find the line where I got the error?
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Using two values for one switch case statement
... SwitchFallThrough {
public static void main(String[] args) {
java.util.ArrayList<String> futureMonths =
new java.util.ArrayList<String>();
int month = 8;
switch (month) {
case 1: futureMonths.add("January");
case 2: fu...
builder for HashMap
Guava provides us with great factory methods for Java types, such as Maps.newHashMap() .
15 Answers
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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...用程序私有存储的路径。
此方法可用于在应用程序首次运行时初始化数据库。只需将完整格式的 SQLite 数据库文件上传到应用程序的资产中，此函数就会将其复制到位。
注意：如果您导入的数据库尚未包含完整格式的“android_m...
Pointers in Python?
...e great static v. dynamic debate. If they were two references to the same Java ArrayList, it would be the same, modulo syntax. If you use immutable objects (like tuples), you don't have to worry about the object being changed through another reference.
– Matthew Flaschen
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What is Gradle in Android Studio?
...s the picture. The build system automatically takes all the source files (.java or .xml), then applies the appropriate tool (e.g. takes java class files and converts them to dex files), and groups all of them into one compressed file, our beloved APK.
This build system uses some conventions: an exa...