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Should I use Java's String.format() if performance is important?
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I wrote a small class to test which has the better performance of the two and + comes ahead of format. by a factor of 5 to 6.
Try it your self
import java.io.*;
import java.util.Date;
public class StringTest{
public static void main( String[] ...
How to map a composite key with JPA and Hibernate?
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Let's take a simple example. Let's say two tables named test and customer are there described as:
create table test(
test_id int(11) not null auto_increment,
primary key(test_id));
create table customer(
customer_id int(11) not null auto_increment,
name varchar(50) not n...
How to study design patterns? [closed]
...toring. I believe the right order to learn about patterns is this:
Learn Test Driven Development (TDD)
Learn refactoring
Learn patterns
Most people ignore 1, many believe they can do 2, and almost everybody goes straight for 3.
For me the key to improve my software skills was learning TDD. It m...
C++ SFINAE examples?
...pedef struct { char a[2]; } Two;
template<typename C> static One test(int C::*);
// Will be chosen if T is anything except a class.
template<typename C> static Two test(...);
public:
enum { Yes = sizeof(IsClassT<T>::test<T>(0)) == 1 };
enum { No = !Yes }...
What is the difference between IEqualityComparer and IEquatable?
...EqualityComparer<T>,
one could ask:
Is there a preferred way of testing two instances of T for equality, or are there several equally valid ways?
If there is only one way of testing two instances of T for equality, or if one of several methods is preferred, then IEquatable<T> wou...
how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
...start transaction; create temporary table temporary_table as select * from test where false; copy temporary_table from 'data_file.csv'; lock table test; update test set data=temporary_table.data from temporary_table where test.id=temporary_table.id; insert into test select * from temporary_table whe...
Differences between Line and Branch coverage
...erage in the first case, so you can see there is something missing in your testing (and often, in your code).
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Can you make just part of a regex case-insensitive?
...hole regular expressions. All options are off by default.
You can quickly test how the regex flavor you're using handles mode modifiers. The regex (?i)te(?-i)st should match test and TEst, but not teST or TEST.
Source
shar...
How to use android emulator for testing bluetooth application?
...o run it on the Android Emulator. How can I use the emulator for bluetooth testing?
2 Answers
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Load dimension value from res/values/dimension.xml from source code
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In my dimens.xml I have
<dimen name="test">48dp</dimen>
In code If I do
int valueInPixels = (int) getResources().getDimension(R.dimen.test)
this will return 72 which as docs state is multiplied by density of current phone (48dp x 1.5 in my case)
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