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Java Security: Illegal key size or default parameters?
...early in your program.
//Imports
import javax.crypto.Cipher;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Map;
//method
public static void fixKeyLength() {
String errorString = "Failed manually overriding key-lengt...
A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic
...
Apache Commons Lang does indeed have a StringUtils.join method which will connect String arrays together with a specified separator.
For example:
String[] s = new String[] {"a", "b", "c"};
String joined = StringUtils.join(s, ","); // "a,...
How do I set the default locale in the JVM?
...le by providing this information on
the command line by setting the user.language, user.country, and
user.variant system properties.
Third, your application can call the Locale.setDefault(Locale)
method. The setDefault(Locale aLocale) method lets your application
set a systemwide (actua...
What is SuppressWarnings (“unchecked”) in Java?
...unexpected ClassCastException s at runtime.
I build on http://www.angelikalanger.com/GenericsFAQ/FAQSections/Fundamentals.html
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Most efficient way to make the first character of a String lower case?
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When it comes to string manipulation take a look to Jakarta Commons Lang StringUtils.
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What is the difference between == and equals() in Java?
...bjects must have equal hash codes. (docs.oracle.com/javase/7/docs/api/java/lang/…)
– Abhijeet
Jul 6 '16 at 13:20
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Conveniently map between enum and int / String
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org.apache.commons.lang.enums.ValuedEnum;
To save me writing loads of boilerplate code or duplicating code for each Enum, I used Apache Commons Lang's ValuedEnum instead.
Definition:
public class NRPEPacketType extends ValuedEnum {
p...
Can I catch multiple Java exceptions in the same catch clause?
...
No, one per customer.
You can catch a superclass, like java.lang.Exception, as long as you take the same action in all cases.
try {
// some code
} catch(Exception e) { //All exceptions are caught here as all are inheriting java.lang.Exception
e.printStackTrace();
}
But that...
How to return an array from JNI to Java?
...(jobjectArray)env->NewObjectArray(5,
env->FindClass("java/lang/String"),
env->NewStringUTF(""));
for(i=0;i<5;i++) {
env->SetObjectArrayElement(
ret,i,env->NewStringUTF(message[i]));
}
return(ret);
}
from link:
htt...
Calculate size of Object in Java [duplicate]
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You can use the java.lang.instrumentation package.
It has a method that can be used to get the implementation specific approximation of object size, as well as overhead associated with the object.
The answer that Sergey linked has a great example...