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Calculate date/time difference in java [duplicate]
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I would prefer to use suggested java.util.concurrent.TimeUnit class.
long diff = d2.getTime() - d1.getTime();//as given
long seconds = TimeUnit.MILLISECONDS.toSeconds(diff);
long minutes = TimeUnit.MILLISECONDS.toMinutes(diff);
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Java default constructor
...ast one constructor, the default constructor is not generated.
Reference: Java Language Specification
If a class contains no constructor declarations, then a default constructor with no formal parameters and no throws clause is implicitly declared.
Clarification
Technically it is not the co...
Quickest way to convert XML to JSON in Java [closed]
What are some good tools for quickly and easily converting XML to JSON in Java?
6 Answers
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Get string character by index - Java
...ystem.out.println(charAtZero); // Prints f
For more information, see the Java documentation on String.charAt. If you want another simple tutorial, this one or this one.
If you don't want the result as a char data type, but rather as a string, you would use the Character.toString method:
String t...
Which types can be used for Java annotation members?
...ents? I swear I google everytime before asking on StackOverlow and on many Java question someone posts a link to the JSL which answers my question. Why do I not find those pages via Google?!
– Daniel Rikowski
Sep 22 '09 at 7:17
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Checking for a null int value from a Java ResultSet
In Java I'm trying to test for a null value, from a ResultSet, where the column is being cast to a primitive int type.
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Copying text to the clipboard using Java
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This works for me and is quite simple:
Import these:
import java.awt.datatransfer.StringSelection;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
And then put this snippet of code wherever you'd like to alter the clipboard:
String myString = "This text will be cop...
What is the volatile keyword useful for?
At work today, I came across the volatile keyword in Java. Not being very familiar with it, I found this explanation .
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Passing a String by Reference in Java?
... it doesn't allocate new String objects every time. In fact when you write Java code like s = "Hello " + name, then the compiler will generate byte code which creates a StringBuilder and calls append() two times.
– Aaron Digulla
May 7 '19 at 13:36
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Package structure for a Java project?
Whats the best practice for setting up package structures in a Java Web Application?
7 Answers
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