The following static function helps you to check if a string contains number.
public static boolean checkIfNumber(String in) {
try {
Integer.parseInt(in);
} catch (NumberFormatException ex) {
return false;
}
return true;
}
Continue reading Java – Check if a string contains integer only
If you don’t want to use Apache Commons which i show you in previous post. You can use the following static function to check if a string is empty.
public static boolean notEmpty(String s) {
return (s != null && s.length() > 0);
}
Done =)
Reference:
Apache Commons IO provides the StringUtils Class for checking empty string in Java.
Add the Apache Commons Lang in the pom.xml. Continue reading Java – Check Empty String with Apache Commons
The following example convert a comma separated string into an array. Continue reading Java – Split a String into an Array
Previously i have created two posts about a simple Swing Date Picker.
Here comes a better solution – JCalendar.
JCalendar is Java Bean which provides a complete feature of a Date Picker in Java. For more information, please visit JCalendar Java Bean, a Java Date Chooser Continue reading Java – JCalendar for Date Selection
I have a previous post which is about a Swing Date Picker in Java.
Java – Swing DatePicker @ 1
But that Date Picker can only navigate in month level, so i would like to add previous year and next year also. I made the following changes on the Date Picker class. Continue reading Java – Swing DatePicker @ 2
I find a very good simple Swing Date Picker example.
Java Swing DatePicker
Create the DatePicker class. Continue reading Java – Swing DatePicker @ 1
Yesterday we try to write the .properties file.
Java – Write .properties
But most of the time we would like to read them file instead. The following Class demonstrate how to write the config.properties. Continue reading Java – Read .properties
The following Class create a .properties file. Continue reading Java – Write .properties
If you want to convert a String into InputStream, you can use the following piece of code.
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import org.apache.commons.io.IOUtils;
public class ConvertStringToInputStream {
public static void main(String[] args) {
try {
// Convert the String into InputStream
String eurekaUrl = "https://ykyuen.wordpress.com";
InputStream is = new ByteArrayInputStream(eurekaUrl.getBytes("UTF-8"));
// Use Apache Commons IO to get the content of the InputStream
System.out.println(IOUtils.toString(is, "UTF-8"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
Eureka! 