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Generate fixed length Strings filled with whitespaces
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Since Java 1.5 we can use the method java.lang.String.format(String, Object...) and use printf like format.
The format string "%1$15s" do the job. Where 1$ indicates the argument index, s indicates that the argument is a String an...
Why are data transfer objects (DTOs) an anti-pattern?
...slightly different format than a native business object.
I know this is a Java-oriented question, but in .NET languages anonymous types, serialization, and LINQ allow DTOs to be constructed on-the-fly, which reduces the setup and overhead of using them.
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How to use JUnit and Hamcrest together?
...g.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
public class EmptyTest {
@Test
public void testIsEmpty() {
List myList = new ArrayList();
assertThat(myList, is(empty()));
}
}
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Most efficient way to cast List to List
...st is a SubClass.
Generic collections do not behave the same as arrays in Java. Arrays are covariant; that is, it is allowed to do this:
SubClass[] subs = ...;
BaseClass[] bases = subs;
This is allowed, because the array "knows" the type of its elements. If someone attempts to store something th...
Where does Scala look for implicits?
...takes n from the current scope
Explicit Imports
import scala.collection.JavaConversions.mapAsScalaMap
def env = System.getenv() // Java map
val term = env("TERM") // implicit conversion from Java Map to Scala Map
Wildcard Imports
def sum[T : Integral](list: List[T]): T = {
val integral ...
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...
String contains - ignore case [duplicate]
...toLowerCase,
you can implement your own custom containsIgnoreCase using java.lang.String.regionMatches
public boolean regionMatches(boolean ignoreCase,
int toffset,
String other,
int ooffset,
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Why is TypedReference behind the scenes? It's so fast and safe… almost magical!
...signed to be a high-performance language. (I'm guessing that "faster than Java" was the performance goal.)
That's not to say that certain performance considerations haven't been afforded. Indeed, such features as pointers, stackalloc, and certain optimized framework functions exist largely to boo...
R cannot be resolved - Android error
... this would generate the incorrect import statement which would hide the R.java class that is automatically generated when you build.
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Abstract Class vs Interface in C++ [duplicate]
...o clear distinction between interface and abstract class in C++ unlike Java and C#. When would it be more preferrable to use an interface instead of an abstract class in C++? Could you give some examples?
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