This example show you how to check if a string content is numeric or not. It provide totally six methods to use. package com.dev2qa.calculatorexample; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * […]
android.widget.RatingBar is used to represent rating bar in android applation. It is subclass of android.widget.ProgressBar, so it behaves similar with ProgressBar. This article will tell you how to use RatingBar […]
We often need to format numbers, such as taking two decimal places for a number, show only integer part of a number etc. Java provide java.text.DecimalFormat class, which can helps […]
When you set a date time value in java, you may encounter time zone issue. You will find the date time you get use java.util.Calendar class will always use the […]
When you write java code in Android Studio, you always need to import some classes which you used in android application. This article will tell you how to import all […]
This example include java code that can be used to check whether a given ip string is valid, inner or public ip or not. Please see code comments for detail […]
This example include java code to check whether a given www domain or a host name string is a valid domain or not. You can see code comments for detail […]
java.io.File provide several methods to get or set file permissions in java code. But the drawback of java.io.File ‘s methods is that it can only separate file permission into two […]
When you need to invoke java command after install JDK successfully, it is better to setup below Java related system environment variable, they are JAVA_HOME, CLASSPATH, PATH. This article will […]
This article will show you how to parse out one java class methods via jdk parser. It will parse out modifier, return type, method name, parameters, throw exception and method […]