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What version of javac built my jar?
How can I tell what version of the Java compiler was used to build a jar? I have a jar file, and it could have been built in any one of three JDKs. We need to know exactly which one, so we can certify compatibility. Is the compiler version embedded somewhere in the class files or jar?
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Bad class file magic or version
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my JAVA_HOME variable changed to Java 1.8 and I got this error message when compiling a pure java module as a dependency of my android project.
build.gradle of the java module
apply plugin: 'java'
Solution #1: Quick an dirty...
INSERT IF NOT EXISTS ELSE UPDATE?
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Have a look at http://sqlite.org/lang_conflict.html.
You want something like:
insert or replace into Book (ID, Name, TypeID, Level, Seen) values
((select ID from Book where Name = "SearchName"), "SearchName", ...);
Note that any field not in the insert l...
javax vs java package
What's the rationale behind the javax package? What goes into java and what into javax?
7 Answers
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How to set time zone of a java.util.Date?
I have parsed a java.util.Date from a String but it is setting the local time zone as the time zone of the date object.
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Why do python lists have pop() but not push()
...t.append in early 1991. By comparison, here's part of a discussion on comp.lang.python about adding pop in 1997. Guido wrote:
To implement a stack, one would need
to add a list.pop() primitive (and
no, I'm not against this particular
one on the basis of any principle).
list.push() cou...
What is java pojo class, java bean, normal class? [duplicate]
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Normal Class: A Java class
Java Beans:
All properties private (use getters/setters)
A public no-argument constructor
Implements Serializable.
Pojo:
Plain Old Java Object is a Java object not bound by any restriction other than those for...
How to get the current time in YYYY-MM-DD HH:MI:Sec.Millisecond format in Java?
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@NickG Where is this toString(String format) method? The java.util.Date doesn't seem to have it. Are you referring to the Joda Time API? But one possible benefit is reuse of the same formatter object. Another is you don't have to add an API - Date class is a standard Java library c...
'AND' vs '&&' as operator
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Actually, other languages (for example, Perl and Ruby) also have these variants with the same precedence distinction so it wouldn't be sensible to deviate from this standard (however puzzling it might be for beginners) by making precedence e...
How to get the current date/time in Java [duplicate]
What's the best way to get the current date/time in Java?
28 Answers
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