大约有 8,000 项符合查询结果（耗时：0.0161秒） [XML]
Command line progress bar in Java
I have a Java program running in command line mode.
I would like to display a progress bar, showing the percentage of job done.
The same kind of progress bar you would see using wget under unix.
Is this possible?
...
Why does writeObject throw java.io.NotSerializableException and how do I fix it?
...
java.io.NotSerializableException can occur when you serialize an inner class instance because:
serializing such an inner class instance will result in serialization
of its associated outer class instance as well
Serializatio...
How to get UTF-8 working in Java webapps?
I need to get UTF-8 working in my Java webapp (servlets + JSP, no framework used) to support äöå etc. for regular Finnish text and Cyrillic alphabets like ЦжФ for special cases.
...
Change the name of the :id parameter in Routing resources for Rails
... backport of the param option for rails 3: gist.github.com/sj26/44ef47fe8b98b46ee32d
– sj26
Aug 29 '14 at 6:53
This w...
When to use Comparable and Comparator
...clear how a comparable would sort, or do you have to resort to reading the javadoc? If it is the latter, odds are every future sorting use case would require a comparator, at which point the implementation of comparable may slow down users of the class, not speed them up.
...
When to use StringBuilder in Java [duplicate]
... generally preferable to use a StringBuilder for string concatenation in Java. Is this always the case?
9 Answers
...
What does JVM flag CMSClassUnloadingEnabled actually do?
I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" ( which it doesn't , btw).
...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...2.
Most ORM tools give you several ways to prevent N+1 selects.
Reference: Java Persistence with Hibernate, chapter 13.
share
|
improve this answer
|
follow
|
...
java : convert float to String and String to float
...
Using Java’s Float class.
float f = Float.parseFloat("25");
String s = Float.toString(25.0f);
To compare it's always better to convert the string to float and compare as two floats. This is because for one float number there a...
How to convert a Map to List in Java?
...
Using the Java 8 Streams API.
List<Value> values = map.values().stream().collect(Collectors.toList());
share
|
improve this a...