Code: public class SplitTest { public static void... Output: Split 1: 'a' ' b ' ' c ' 'd ' S...

Create BroadcastReceiver class (implement onReceive ): import android.content.*; import android.net.Ur... Declare receiver with intent filter in AndroidManifest.xml : <receiver android:name="PackageChangeReceiver"> ... In order to receive the broadcasts, the data element is required in addition to the action elements in the intent filter. When a package is being replaced, the Android system actually broadcasts three intents (in this order): ACTION_PACKAGE_REMOVED ACTION_PACKAGE_ADDED ACTION_PACKAGE_REPLACED To tell that that an ACTION_PACKAGE_REMOVED or ACTION_PACKAGE_ADDED intent is received as the result of a package being replaced (instead of plain add or remove), check the EXTRA_REPLACING flag: boolean replacing = intent.getBooleanExtra(Intent....

This is a utility to convert a string value to one of the primitive type values. It is useful in Java reflection code where the value comes in as a string (e.g., from XML parsing), and the type of the value cannot be decided until runtime. import java.util.*; import java.lang.reflect.*;... Note: This method can be extended to convert string to more complex types by writing a converter for the destination type. For example, to convert string to date: public class DateConverter { public static ... Usage: Date d = (Date) ConvertUtil.convert("10/12/2010", ...

Example code: import java.lang.reflect.*; public class Co...

The class java.lang.Package provides a static method to get a package by name: Package.getPackage() . Example code: public class GetPackageInfo { public static...

You would never have guessed it. The test is: Modifier.isStatic(method.getModifiers()) ! Example code: import java.lang.reflect.Method; import java.la...

import java.lang.reflect.Method; public cla...

For Java arrays, the class name is [ followed by an encoded name of the element class. The number of [ characters represents the number of dimensions of the array. The class name encoding is following: Element Type Encoding boolean Z byte B char C class or interface L classname; double D float F int I long J short S Example: public class ClassNameEncoding { public sta...

Class.isAssignableFrom() returns true only if the argument is identical to the current class or is a subclass of the current class. Example: public class AssignableTest { public static... Even though an int can be assigned to an Integer and vice versa through auto-boxing, isAssignableFrom returns false when called one way or the other. // This compiles and runs. But isAssignableFrom() ...

The Java regex expression \B matches a non-word boundary, which is anything other than a word boundary. import java.util.regex.*; public class NonW... Output: p1 match: word at 40 p1 match: word at 83 ...