The java.lang.System‘s out and err objects are used to write text data to the standard output stream and standard error stream. The default output stream is the command-line console. But the java.lang.System class also provides a method for you to redirect the standard output stream to other destinations such as file stream. With this, you […]
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This example will tell you how to use java standard input, output, and error object to read string data from user command line input, write string data to standard output console and display error messages to standard error output. All the standard input or output object is the static variable of java.lang.System class.
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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; /** * Created by zhaosong on 2018/5/23. */ public class CheckStringNumeric { public static void main(String args[]) { CheckStringNumeric checkStringNumeric = new CheckStringNumeric(); checkStringNumeric.isNumeric(“-123.45”); checkStringNumeric.isInteger(“-123”); checkStringNumeric.isIntegerByParse(“-123.456”); checkStringNumeric.isDoubleByParse(“-123.456789”);
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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 in android, it also show you example about how to customize RatingBar background, stars and it’s behaviour.
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We often need to format numbers, such as taking two decimal places for a number, show only the integer part of a number, etc. Java provides java.text.DecimalFormat class, which can help you to format numbers use your specified pattern as quickly as possible.
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When you set a date-time value in java, you may encounter a timezone issue. You will find the date-time you get use java.util.Calendar class will always use the system default timezone. This example will tell you how to change it to show the date-time in your desired timezone.
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When you write java code in Android Studio, you always need to import some classes which you used in the android application. This article will tell you how to import all used classes automatically.
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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 explanation.
Check If A String Is Valid, Inner, Public Ip Java Example Read More »
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 explanation.
Check Valid WWW Domain And HostName Java Examples Read More »
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 groups which is owner or all users. So java 7 introduce java.nio.file.attribute.PosixFilePermission which provide methods that can let you define file permission more accurately for different
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