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Why Collections.sort uses merge sort instead of quicksort?
... hand,
requires O(n) external space. The TimSort variant (introduced in Java
SE 6) requires substantially less space (O(k)) if the input array is
nearly sorted.
Also, the following is relevant:
The algorithm used by java.util.Arrays.sort and (indirectly) by
java.util.Collections.sort...
How to properly stop the Thread in Java?
I need a solution to properly stop the thread in Java.
9 Answers
9
...
Retrieving a random item from ArrayList [duplicate]
I'm learning Java and I'm having a problem with ArrayList and Random .
12 Answers
1...
Is the ternary operator faster than an “if” condition in Java [duplicate]
...
Also, the ternary operator enables a form of "optional" parameter. Java does not allow optional parameters in method signatures but the ternary operator enables you to easily inline a default choice when null is supplied for a parameter value.
For example:
public void myMethod(int par1, St...
Reload the path in PowerShell
... "PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin"
Example usage:
> SET JAVA_HOME=c:/java/jdk6
> SET PATH=%JAVA_HOME%/bin
> ECHO %PATH%
c:/java/jdk6/bin
> SET JAVA_HOME=c:/java/jdk8
> refreshenv
Refreshing environment variables from registry for cmd.exe. Please wait...Finished..
>...
How do I get the size of a java.sql.ResultSet?
...
if(rs.last()){
rowCount = rs.getRow();
rs.beforeFirst();
}
:
java.sql.SQLException: Invalid operation for forward only resultset
it's due to by default it is ResultSet.TYPE_FORWARD_ONLY, which means you can only use rs.next()
the solution is:
stmt=conn.createStatement(ResultSet.TYP...
How to see if an object is an array without using reflection?
How can I see in Java if an Object is an array without using reflection?
And how can I iterate through all items without using reflection?
...
How to print color in console using System.out.println?
...
Here are a list of colors in a Java class with public static fields
Usage
System.out.println(ConsoleColors.RED + "RED COLORED" +
ConsoleColors.RESET + " NORMAL");
Note
Don't forget to use the RESET after printing as the effect will remain if it's not...
How to split a string with any whitespace chars as delimiters
What regex pattern would need I to pass to java.lang.String.split() to split a String into an Array of substrings using all whitespace characters ( ' ' , '\t' , '\n' , etc.) as delimiters?
...
Keyboard shortcut to change font size in Eclipse?
...worked for me on some files but not on the ones I cared about: .scala and .java files. The problem turned out to be that eclipse-fonts appears to affect only the "Text Font" setting rather than being aware of the font setting used in the current window. If you have changed the "Java Editor Text Fo...