I’m looking for a Java library which represents fractions (rational numbers). For example, if I want to store the fraction 1/3 then it will not be saved as 0.33333 which will lose its accuracy. Here …
Tag: java
How to configure the jdk14 logging’s pattern
I guess I can chnage pattern by adding the line java.util.logging.ConsoleHandler.pattern, however where to check the pattern information like %u %h etc?
How can I count the number of occurrences of a simple pattern in a string?
For this question, a “pair” in a string is defined as a situation where two instances of one character are separated by another character. So in “AxA” the A’s make a pair. Pairs can overlap, so “AxAxA”…
What’s the advantage of load() vs get() in Hibernate?
Can anyone tell me what’s the advantage of load() vs get() in Hibernate? Answer Whats the advantage of load() vs get() in Hibernate? load() get() Only use load() method if you are sure that the object exists. If you are not sure that the object exist, then use one of get() methods. load() method will th…
How can i sort a string without using sort() method in java?
I want to sort a string “computer” -> “cemoprtu”, but without using Arrays.sort(string). Answer Looks like you need to sort the characters, so I’d start with
Limit Decimal Places in Android EditText
I’m trying to write an app that helps you manage your finances. I’m using an EditText Field where the user can specify an amount of money. I set the inputType to numberDecimal which works fine, except that this allows people to enter numbers such as 123.122 which is not perfect for money. Is there…
What is the most efficient way to access particular elements in a SortedSet?
I want to use a collection that is sorted, but one in which I can access elements by index, i.e. I want something that has characteristics of both a Set and a List. Java.util.TreeSet comes real close to what I need, but doesn’t permit access via an index. I can think of several options: I could iterate …
What is the simplest way to draw in Java?
What is the simplest way to draw in Java? This doesn’t work and I have no idea how to get anything to appear. Answer Easiest way: You simply need to extend JPanel and override the paintComponent method of the panel. I’d like to reiterate that you should not be overriding the paint method. Here is …
Intersection and union of ArrayLists in Java
Are there any methods to do so? I was looking but couldn’t find any. Another question: I need these methods so I can filter files. Some are AND filters and some are OR filters (like in set theory), so I need to filter according to all files and the unite/intersects ArrayLists that holds those files. Sho…
How does Hibernate detect dirty state of an entity object?
Is it using some kind of byte codes modification to the original classes? Or, maybe Hibernate get the dirty state by compare the given object with previously persisted version? I’m having a problem with hashCode() and equals() methods for complicated objects. I feel it would be very slow to compute hash…