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Why is a ConcurrentModificationException thrown and how to debug it
...n that is being iterated over is modified by anything other than the Iterator itself.
Iterator it = map.entrySet().iterator();
while (it.hasNext())
{
Entry item = it.next();
map.remove(item.getKey());
}
This will throw a ConcurrentModificationException when the it.hasNext() is called the se...
Reading specific lines only
I'm using a for loop to read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?
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What is the difference between association, aggregation and composition?
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For two objects, Foo and Bar the relationships can be defined
Association - I have a relationship with an object. Foo uses Bar
public class Foo {
void Baz(Bar bar) {
}
};
Composition - I own an object and I am ...
What is a predicate in c#? [duplicate]
...nient way of basically testing if something is true of a given T object.
For example suppose I have a class:
class Person {
public string Name { get; set; }
public int Age { get; set; }
}
Now let's say I have a List<Person> people and I want to know if there's anyone named Oscar in...
Android Studio Editor Font Sizing
Is there any way to make the editor text larger in Android Studio?
10 Answers
10
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When and how should I use a ThreadLocal variable?
... avoid synchronizing access to that object (I'm looking at you, SimpleDateFormat). Instead, give each thread its own instance of the object.
For example:
public class Foo
{
// SimpleDateFormat is not thread-safe, so give one to each thread
private static final ThreadLocal<SimpleDateFor...
Why does changing 0.1f to 0 slow down performance by 10x?
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Welcome to the world of denormalized floating-point! They can wreak havoc on performance!!!
Denormal (or subnormal) numbers are kind of a hack to get some extra values very close to zero out of the floating point representation. Operations ...
input type=“text” vs input type=“search” in HTML5
I'm new to HTML5 as begun to work with HTML5's new form input fields. When I'm working with form input fields, especially <input type="text" /> and <input type="search" /> IMO there wasn't any difference in all major browser including Safari, Chrome, Firefox and Opera. And the search...
Delete files or folder recursively on Windows CMD
How do I delete files or folders recursively on Windows from the command line?
12 Answers
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How do I find out my python path using python?
How do I find out which directories are listed in my system’s PYTHONPATH variable, from within a Python script (or the interactive shell)?
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