大约有 30,000 项符合查询结果（耗时：0.0464秒） [XML]
Handling a Menu Item Click Event - Android
...s"
android:icon="@android:drawable/btn_radio"/>
</menu>
Java code looks like
src/MainActivity.java
@Override
public boolean onCreateOptionsMenu(Menu menu) {
present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
publ...
Why does Java switch on contiguous ints appear to run faster with added cases?
I am working on some Java code which needs to be highly optimized as it will run in hot functions that are invoked at many points in my main program logic. Part of this code involves multiplying double variables by 10 raised to arbitrary non-negative int exponent s. One fast way (edit: but no...
Convert a RGB Color Value to a Hexadecimal String
In my Java application, I was able to get the Color of a JButton in terms of red, green and blue; I have stored these values in three int s.
...
What is the difference between statically typed and dynamically typed languages?
... that you as the programmer must specify what type each variable is (e.g.: Java, C, C++); other languages offer some form of type inference, the capability of the type system to deduce the type of a variable (e.g.: OCaml, Haskell, Scala, Kotlin)
The main advantage here is that all kinds of checking...
Why is Go so slow (compared to Java)?
...g them entirely (e.g. predicting virtual call destinations in JIT-compiled Java) starts to get tricky.
FWIW, my own very trivial test with Go when I was taking a look at it (a loop of integer addition, basically), gccgo produced code towards the fast end of the range between gcc -O0 and gcc -O2 for...
When and why would you seal a class?
...d be a conscious decision as well. (In C# this is a conscious decision; in Java it isn't.)
EDIT: Some relevant links:
Effective Java, 2nd Edition by Joshua Bloch. See item 17 (requires Safari subscription)
Effective Java Item 17: Design and document for inheritance or else prohibit it (discussion ...
How do shift operators work in Java? [duplicate]
...
Java defines shift to mask (wrap around) the count down to the 0-31 range, rather than saturate to 32 (if shift by 32 left only zeroes). (using 32bit types for example, obviously.) I assume this decision was made to match t...
User recognition without cookies or local storage
...IP address Can change
Browser Can Change
Browser Cache may be deleted
A Java Applet or Com Object would have been an easy solution using a hash of hardware information, but these days people are so security-aware that it would be difficult to get people to install these kinds of programs on their...
Difference between web reference and service reference?
...posters indicate that it is only ASMX, but Web References can also talk to Java-based Web Services or Python-based or Ruby so long as they all talk WSDL and conform to the WS-I interoperability standard).
A Service Reference will create a client proxy class that communicates with a WCF-based servic...
Eclipse: The declared package does not match the expected package
... me, I'll share how I solved this problem.
It turns out that I opened the java file under the 'src' before declaring it a source directory.
After right clicking on the 'src' directory in eclipse, selecting 'build path', and then 'Use as Source Folder'
Close and reopen the already opened java file...