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How and where are Annotations used in Java?
...t it is more convenient to use annotations because they will belong to the Java code itself, and are hence much easier to manipulate than XML.
Usage of annotations:
Documentation, e.g. XDoclet
Compilation
IDE
Testing framework, e.g. JUnit
IoC container e.g. as Spring
Serialization, e.g. XML
Asp...
What is a NullPointerException, and how do I fix it?
What are Null Pointer Exceptions ( java.lang.NullPointerException ) and what causes them?
12 Answers
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What's the difference between == and .equals in Scala?
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Does it also apply when using Java libraries?
– Jus12
Oct 6 '11 at 22:50
20
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Get generic type of class at runtime
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I am getting java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType for this answer.
– Tomáš Zato - Reinstate Monica
May 1 '15 at 13:14
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How to read the value of a private field from a different class in Java?
... @legend you can install a security manager to forbid such access. Since Java 9, such access is not supposed to work across module borders (unless a module is open explicitly), though there’s a transitional phase regarding enforcement of the new rules. Besides that, requiring additional effort l...
Why doesn't String switch statement support a null case?
I am just wondering why the Java 7 switch statement does not support a null case and instead throws NullPointerException ? See the commented line below (example taken from the Java Tutorials article on switch ):
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Is it good practice to use java.lang.String.intern()?
The Javadoc about String.intern() doesn't give much detail. (In a nutshell: It returns a canonical representation of the string, allowing interned strings to be compared using == )
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Android: java.lang.SecurityException: Permission Denial: start Intent
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The java.lang.SecurityException you are seeing is because you may enter two entries pointing to the same activity. Remove the second one and you should be good to go.
More Explanation
You may be declared the activity 2 times in...
Convert a JSON string to object in Java ME?
Is there a way in Java/J2ME to convert a string, such as:
14 Answers
14
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Can I obtain method parameter name using Java reflection?
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In Java 8 you can do the following:
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import java.util.List;
public final class Methods {
public static List<String> get...