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Best way to create enum of strings?
... Strings(final String text) {
this.text = text;
}
/* (non-Javadoc)
* @see java.lang.Enum#toString()
*/
@Override
public String toString() {
return text;
}
}
Alternatively, you can create a getter method for text.
You can now do Strings.STRING_ONE.toS...
HashMap to return default value for non-found keys?
...
[Update]
As noted by other answers and commenters, as of Java 8 you can simply call Map#getOrDefault(...).
[Original]
There's no Map implementation that does this exactly but it would be trivial to implement your own by extending HashMap:
public class DefaultHashMap<K,V> e...
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...
How do you specify the date format used when JAXB marshals xsd:dateTime?
...customize how a date type is written to XML.
package com.example;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public class DateAdapter extends XmlAdapter<String, Date> {
private final SimpleDateFormat dateFormat = new...
Is there a method that works like start fragment for result?
...aredViewModel = ViewModelProviders.of(activity).get(SharedViewModel::class.java)
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_first...
How do servlets work? Instantiation, sessions, shared variables and multithreading
...ets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (read: HTTP requests) can make use of the same instance. It would otherwise be too expensive to recreate, init() and destroy() them for every single request.
You should also rea...
java: Class.isInstance vs Class.isAssignableFrom
...
I disagree. If you look up the Javadoc of Byte you will discover it extends Number and is a class. (byte) 1 is not equivalent to Byte. The former is a primitive. The latter is a Class.
– Gili
Feb 28 '14 at 22:11
...
Do you (really) write exception safe code? [closed]
...you really write exception safe code?
Of course, I do.
This is the reason Java lost a lot of its appeal to me as a C++ programmer (lack of RAII semantics), but I am digressing: This is a C++ question.
It is, in fact, necessary when you need to work with STL or Boost code. For example, C++ threads (...
Is it unnecessary to put super() in constructor?
...tends Base { }
This is fine because if you add no constructor explicitly Java puts in a public default constructor for you.
public class Base { }
public class Derived extends Base { public Derived(int i) { } }
Also fine.
public class Base { public Base(String s) { } }
public class Derived exte...
Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
...1;
f = f*n;
end
disp(['n! = ' num2str(f)])
Btw, the for-each loop in Java (and possibly other languages) produces unspecified behavior when the data structure is modified during iteration. If you need to modify the data structure, you should use an appropriate Iterator instance which allows th...