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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...
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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...
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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...
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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...
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How comment a JSP expression?

...'t appeal to you: <% /*= map.size()*/ %> Code Conventions for the JavaServer Pages Technology Version 1.x Language has details about the different commenting options available to you (but has a complete lack of link targets, so I can't link you directly to the relevant section - boo!) ...
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What does cmd /C mean? [closed]

I can understand cmd but not cmd /c . I was trying to invoke a java program from the current for which I use Runtime.getRuntime().exec("cmd /C java helloworld"); There arises my doubt. ...
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Javascript date.getYear() returns 111 in 2011? [duplicate]

I have this javascript for automatically setting a date filter to the first and last day of the previous month: 3 Answers ...
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How to always show scrollbar

...xml which is equivalent to ScrollView.setScrollbarFadingEnabled(false); in java code. share | improve this answer | follow | ...
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How to sort ArrayList in decreasing order?

How to sort an ArrayList<Long> in Java in decreasing order? 14 Answers 14 ...
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How to use IntelliJ IDEA to find all unused code?

When I am in a .java file the unused code is usually grayed out or has a green underline saying this code will probably (probably because of some weird JNI/Reflection corner cases) be unused. But I have this project with thousands of Java files and I want to find ALL INSTANCES of such probable-unuse...