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Creating temporary files in Android
...se the File.deleteOnExit() method
https://developer.android.com/reference/java/io/File.html#deleteOnExit()
It is referenced here https://developer.android.com/reference/java/io/File.html#createTempFile(java.lang.String, java.lang.String, java.io.File)
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How to make ThreadPoolExecutor's submit() method block if it is saturated?
...nHandler for that or is there an existing way to do this using a standard Java library?
17 Answers
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What is a WeakHashMap and when to use it? [duplicate]
...cted when nothing else references it. (BTW, a strong reference is a normal java reference). There are also weak references which tend not to be as readily collected as soft references (which don't tend to hang about for long after the last strong reference disappears)
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What is null in Java?
...hat it's "merely a special literal that can be of any reference type".
In Java, null == null (this isn't always the case in other languages). Note also that by contract, it also has this special property (from java.lang.Object):
public boolean equals(Object obj)
For any non-null reference ...
Why is the String class declared final in Java?
From when I learned that the class java.lang.String is declared as final in Java, I was wondering why that is. I didn't find any answer back then, but this post: How to create a replica of String class in Java? reminded me of my query.
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How to change language of app when user selects language?
...ctivity(refresh);
}
Make sure you imported following packages:
import java.util.Locale;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.util.DisplayMetrics;...
Populating Spring @Value during Unit Test
...eflectionTestUtils - it has a method setField to set private fields.
@see JavaDoc: ReflectionTestUtils.setField(java.lang.Object, java.lang.String, java.lang.Object)
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Convert String to equivalent Enum value
...me to convert a String to an equivalent value in an Enumeration , using Java.
4 Answers
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Comparing two java.util.Dates to see if they are in the same day
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Joda-Time
As for adding a dependency, I'm afraid the java.util.Date & .Calendar really are so bad that the first thing I do to any new project is add the Joda-Time library. In Java 8 you can use the new java.time package, inspired by Joda-Time.
The core of Joda-Time is the...
When should a class be Comparable and/or Comparator?
...comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its instances.
Comparator
A comparator object is capable of comparing two different objects. The class is not comparing its instances, but some other class’s i...