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Created by Dr. Xi on March 08, 2012 12:13:57    Last update: March 08, 2012 12:13:57
This example creates an instance of XMLGregorianCalendar and converts it to java.util.Date : import java.util.Date; import javax.xml.datatyp...
Created by Dr. Xi on May 02, 2011 15:59:37    Last update: February 25, 2012 09:16:37
This code snippet gets the default keystore used by the Java keytool and displays the list of aliases along with the key type (certificate or private key). import java.io.File; import java.io.FileInputSt... The default keystore used by the above code is: $HOME/.keystore .
Created by magnum on August 11, 2010 19:22:06    Last update: November 28, 2011 08:16:22
import java.text.DateFormat; import java.text.S... Output: Date LONG format: November 28, 2011 Date MEDIUM...
Created by Dr. Xi on November 11, 2011 10:05:22    Last update: November 11, 2011 10:12:01
This is an HTML image tag filter using Java regex. It takes a string, finds the img tags, replaces the src attribute with one provided by the filter, then adds a class name to the class attribute. import java.util.regex.*; import java.io.*; ... Test file: <div id="HTML snippet"> <img src="img/big/txt-m...
Created by Dr. Xi on July 27, 2011 08:55:34    Last update: July 27, 2011 08:55:34
It is OK to remove elements from a list with Iterator , but you get UnsupportedOperationException if the list is created with Arrays.asList : import java.util.*; public class IteratorRe... Prints: ArrayList test: ================ List size: ...
Created by alfa on July 15, 2011 13:25:45    Last update: July 15, 2011 13:25:45
Read the whole contents of a file into a String. It's better to read the whole file as bytes and convert to String than to read the file line by line and concatenate the lines. String getFileContents(String fileName) throws... Using java.nio : import java.io.FileInputStream; import java...
Created by Dr. Xi on July 15, 2011 09:25:15    Last update: July 15, 2011 09:25:15
Some methods to search for a substring within a string: To know that a substring indeed exists within a string: boolean found = wholeString.contains(substring); To find where the substring is contained: int index = wholeString.indexOf(substring); If the substring is regex: boolean match = wholeString.matches(".*" + substri... Case insensitive match: convert both whole string and substring to lowercase, then compare. Or, use case insensitive flag for regex. Test code: import java.util.regex.*; public class Stri...
Created by Dr. Xi on July 14, 2011 09:28:57    Last update: July 14, 2011 09:28:57
Java arrays are fixed size, so you have to make a new array with smaller size and copy the data. For JDK6 and above: // import java.util.Arrays; newArray = Arrays.c... Before that (using Object as example): Object[] newArray = new Object [newSize] ; Syst...
Created by Dr. Xi on August 13, 2007 20:27:11    Last update: July 13, 2011 16:20:28
Sample code: import java.util.*; public class TestArrayL... If you use iterators, the for loop is equivalent to: for (Iterator<String> i = l.iterator(); i.hasNext(... The simplified for loop (or, for-each loop) can be used for arrays or objects that implement java.lang.Iterable . Note that by using generics, there's not need to down cast. But new for loop syntax doesn't down cast either. If List<String> is changed tp List<Object> , the code doesn't compile.
Created by Dr. Xi on July 13, 2011 16:18:05    Last update: July 13, 2011 16:18:05
The goal is to read a file like this: for (String line: textFileReader) { // do s... This is the code: import java.io.*; import java.util.Iterator; ...
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