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Do interfaces inherit from Object class in java
...nherits it from a superinterface).
This is explained in detail in the Java Language Specification, § 9.2 Interface Members.
9.2 Interface Members
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If an interface has no direct superinterfaces, then the interface implicitly declares a public abstract member method m with signature s, return ...
java.lang.IllegalArgumentException: View not attached to window manager
...ly via AsyncTask.cancel()) closing it via .cancel().
Got the same "java.lang.IllegalArgumentException: View not attached to window manager" error when I was killing the dialog in the onCancelled() method of the AsyncTask (I'd seen this done in the excellent Shelves app).
The workaround was to ...
StringUtils.isBlank() vs String.isEmpty()
...") = false
StringUtils.isEmpty(" bob ") = false
Warning: In java.lang.String.isBlank() and java.lang.String.isEmpty() work the same except they don't return true for null.
java.lang.String.isBlank() (since Java 11)
java.lang.String.isEmpty()
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How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
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java.lang.UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime.
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Java Serializable Object to Byte Array
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The best way to do it is to use SerializationUtils from Apache Commons Lang.
To serialize:
byte[] data = SerializationUtils.serialize(yourObject);
To deserialize:
YourObject yourObject = SerializationUtils.deserialize(data)
As mentioned, this requires Commons Lang library. It can b...
Catching java.lang.OutOfMemoryError?
Documentation for java.lang.Error says:
14 Answers
14
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Null check in an enhanced for loop
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Use ArrayUtils.nullToEmpty from the commons-lang library for Arrays
for( Object o : ArrayUtils.nullToEmpty(list) ) {
// do whatever
}
This functionality exists in the commons-lang library, which is included in most Java projects.
// ArrayUtils.nullToEmpty sourc...
Is it expensive to use try-catch blocks even if an exception is never thrown?
...Generally speaking, I recommend not to worry about the performance cost of language constructs until you have evidence of an actual performance problem in your code. Or as Donald Knuth put it: "premature optimization is the root of all evil".
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Getting java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory exception
i am executing simple Dependency Injection program of spring & getting this exception.
I have already included common-logging1.1.1.jar and spring.jar file. Could you please help to out?
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Why is the clone() method protected in java.lang.Object?
...hat is the specific reason that clone() is defined as protected in java.lang.Object ?
11 Answers
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