In this section of Java Examples, we are going to illustrate various Java Get examples like how to get the date and time, IP Address or memory size etc.
In this section of Java Examples, we are going to illustrate various Java Get examples like how to get the date and time, IP Address or memory size etc.In this section of Java Examples, we are going to illustrate various Java Get examples like how to get the date and time, IP Address or memory size etc.. If you are a Java beginner this is a best place for you to learn different methods, functions and class used in Java Language.
Just go through the given examples to get the things fast and practice these code at your end to learn java easily. After going through this section you will be able to retrieve different values whether it is a database size or memory size using Java programming language.
Java Get Examples..
Java example program to get the object's ID
In java there is no any specific method that provides
us the object's ID. But each object has its own unique hash value which can be
treated as unique Id for that object.
Java example to get Object class name at runtime
In java there is a way that makes us enabled to get the
object class name at runtime. It can be done by calling the getClass()
method on the class object. Then by calling the method getName() we
can get the name of the object class.
Java example program to get extension
To get the file name and file extension separately we
can do the string manipulation on the file name. Suppose "filename.ext"
is some filename with extension is provided.
Java example to calculate the execution time
This example program will describe you the way that how
one can calculate or get the execution time of a method or program in java. This
can be done by subtracting the starting time of the program or method by the
ending time of the method.
Java example to get the execution path
We can get the execution path of the system in java by
using the system property. For getting execution path we have used "user.dir"
property of the system.
Java example program to get epoch time of windows
Epoch is used to compare dates with the some other
dates or dates with the other time format mathematically. That's why it is being
used through out the whole programming world.
Java example program to get the environment variable
The getenv() method of the java.lang.System
provide us the functionality to get the environment variable value. To get
the single environment variables value we have to call the getenv("environment
variable") method where environment variable is a value that we want to
evaluate.
Java get Next Day
In the given example, we have used the class DateFormatSymbols in
order to get the names of the days of the week. The method getWeekdays()
provide the string of days of week. To get the current day, we have used the
Calendar class.
Java get yesterday's date
In the given example, we simply get the current date by using the method dateFormat.format(cal.getTime()).But
on subtracting one day from the calendar by using the method cal.add(Calendar.DATE,
-1), the method dateFormat.format(cal.getTime()) will displayed the
yesterday's date.
Java get number of days between dates
In order to get the number of days between two dates, the given example has
set two dates by using the Calendar.set(int year, int month, int date).
Java get Year
In this section, you will learn how to obtain the current year. The
Calendar class provides a getInstance() method that returns a Calendar
object.
Java get year from date
In this section you will study how to retrieve the year from the date. You
can see in the given example that we have called SimpleDateFormat class showing the
format of year.
Java get number of Processors
To display the number of processors available to a current Java Virtual
Machine, we have used the method availableProcessors() of class Runtime and the
method getRuntime() returns the instance of Runtime class with the java
application.
Java get Heap Size
In this section, we are going to illustrates you how to obtain the heap size.
The heap is the area in the memory used for memory storage during the runtime of
the program.
Screen Dimensions
The Toolkit class has a static method called getDefaultToolkit() and can be
used to obtain the default Toolkit object for the user's system, which contains
information about the user's specific machine.
Number of Days in Month
This example sets the year as 2008, month as Calendar.FEBRUARY and the date
as 1 using the method calendar.set(year, month, date) provided by the class
Calendar.
Number of rows in
result set
In this section, you will learn how to retrieve the number of rows from the
database table. As you know that the data is stored in the database table in the
form of row and column.
Http
Headers in Java
In this section, we are going to illustrate you how to get the Http Headers.
Here, we are using the URL class which points the resource. In order to make a
communication link between the application and a URL, we have used the class
URLConnection.
Filename without Extension
In this section, you will learn how to obtain the filename without extension.
For this, the file name or the directory name is being provided.
Java get available Font
In order to retrieve all the available fonts, we have used the AWT package.
The class
GraphicsEnvironment describes the collection of all the available
GraphicsDevices and Font objects.
Find Free Memory
In this section, we are going to obtain the free memory. In order to get the
memory left of being allocated, the method getruntime() returns the runtime
object associated with the Java application.
Folder
Size in Java
In the given example, we are going to show you the size of specified folder
and also the number of files and folders that are presented in the specified
folder.
XML File
In this section, you will study how the java application read the XML file.
For this, you need to create a XML file.
Java get windows Username
In this section, you will learn how to obtain the window's username. We are
providing you an example which will obtain the window's username by using the System.getProperty().
Java get Version
In this section, you will learn how to obtain the java version and the OS
version. We are
providing you an example which will obtain the java version installed on the
system and the OS version by using the System.getProperty().
Get User Input
In this section, you will learn how to get the user input from the command
prompt. We are providing you a java application that will communicate with the
user at the command line and returns the user input.
Java get User Home
In this section, you will study how to get the user home. We are providing
you an example which will obtain the home directory by using the System.getProperty().
System TimeZone
In this section, you will learn how to obtain the System's TimeZone. The Time
Zone is basically the uniform standard time usually referred to as the local
time.
System Properties
In this section, you will learn how to obtain the system properties. The
System class provides a Properties object that describes the configuration of
the current working environment of the system.
System Locale
In this section, you will learn how to obtain the locale. We are
providing you an example which will obtain the locale of the system by using the
System.getProperty().
Java get Stack Trace as String
In this section, you will learn how to get the stack trace of an exception as
a String. We are providing you an example, which is throwing an
IllegalArgumentException using Throwable class.
Modify Properties
In this section, you will learn how to modify the set of system properties by
adding a new property. In the example given below, we have create a new property
listed in the 'NewProperties.txt' file i.e java.company=Roseindia Pvt Ltd which
is not an actual System Property.
Node Value
In this section, you will learn how to obtain the node value. Before any
further processing, you need a XML file. For this we have create a employee.xml
file.
Get Node Text
In this section, you will learn how to obtain the text of the node in the
specified XML file. For this we have create a 'employee.xml' file. In the given
example, we have used XMLInputFactory class in order to get the
streams.
Java get Stack Trace
When you want to generate an exception in a program, it
will be better to print out the exception stack trace to catch the error instead
of using e.getMessage() method.
Progress Bar in Java
Progress Bar is a component used to show the status of the application that
how much time is left in order to complete the task of a specified application.
Radio Button in Java
Radio Button is a circular button on web page that can be selected by the user.
The AWT Widget used to create a radio button is Checkbox. The Checkbox
class is used by the AWT to create both Radio Button and Checkbox.
Menu Bar in Java
A Menu Bar is a set of option that allow the user to choose from any one of
the saving option. A list of other option component a user can
choose in a menu bar.
Java get year from date
In this section you will study how to retrieve the year from the date. You
can see in the given example that we have called SimpleDateFormat class showing the
format of year.
Popup Box in JavaScript
Popup is used to create and show a component to the user, usually available
on top of the window component in a particular hierarchy. The Popups have a
small life cycle.
Illegal start of type
The Java error illegal start of type occurred in your code when the starting
braces of catch block is not used after the close of try block.
Unreachable statement
In this Tutorial we want to describe you a code that help you in
understanding a unreachable statement. For this we have a class name' unreachable
error', Inside the main method we have a for loop that has a variable
integer I.;.
Java error stream
The Java error stream is used to print error that arises during the execution
of a program. The execution of program display an output and error to the
different stream that allows the user to move them to different pages thereby
isolating them.
Error reached end of file while parsing
Java Error reached end of file while parsing occurred when a programmer
do not close the class braces properly.
Error java.lang.nullpointerexception
NullPointerException is the exception that occurred when a programmer
perform an operation on a object or calling a method on the object i.e null. This
exception is thrown by JVM.We should not handle that exception by try and catch block
Error java.lang.noclassdeffounderror
The Java.lang. noclassdeffounder occurred in a code when the programmer write
a wrong class name on the command prompt during the execution or running of the
program.
Get Length of Array
In this Tutorial we want to describe you a code that help you in understanding
the java error message. For this we have a class name java error message.
Java error log
Java error log is a error that arises due to internal error. A error logger
is simple an object that is used to show an error log message for a specifice
system and component used in an application.
Java error incompatible types
Java Error incompatible types occurred when a compiler found a variable and
expression whose data type is not compatible to perform an operation on them.
Java error identifier excepted
Java Error Identifier excepted occurred when the programmer do not specify
the data type of a variable inside the class definition
Java error icon
JOptionPane's icon
support specify icon to which the dialog displays. We can use four standard icon
using JOptionPane
icons like question, information, warning,
and error).
Java error dialog
A Java dialog box is an independent sub window that is used to notice a
temporary message to the user. The dialog box find its extensive application in image, directory
and anything compatible with swing.
Java error class interface or enum excepted
Java Error class interface or enum excepted are the class of java error that occurred
when a programmer placed a brace in improper place or braces are not properly
closed.
Java error code
Java Error code are the set of error that occurs during the compile-time and
Run-time. From java error we have given you a sample of code that makes
you to understand the java error code in a better way.
Display a dialog box with Java Error
In this Tutorial we want to describe you a code that help you in
implementation of dialog box with Java Error. For this we have a class name
could_not_find_mainclass.Inside the main method we print the
"couldnotfoundthemainclass"using System.out.println.
Java error cannot find symbol
The java error cannot find symbol occurred when a Compiler does not recognize
a class name.
Java get default Charset
We can achieve the default charset
through the java program. In our example java program we have created an object
of FileWriter and then we will be using getEncoding() method for
getting the default charset of this file writer.
Java error reading from file
Java error reading file are the common error occurred in java that when
the user encounter a corrupt file and show a message to the user reason for the
failure.
Java error missing return statement
Java error missing return statement are those error in Java that occurred
when a programmer forget to write a return statement inside the conditional clauses. method
with a non-void return provides you an object of the specific type.
Get Current Thread
A Thread is the independent path of execution in a program. Many thread runs
concurrently with a program. Some threads are Multithread, This thread refers to
two or more thread running simultaneously within a program.
Java error class
Java error class is subclass of throw able class. This mean the
application does not able to catch the error occurred in the try block. These
error occurred due to abnormal condition.
Java error cannot read
The Java error cannot read occurred when a programmer do not follow the
following condition.
Get Thread Name
Thread is the independent path of execution of a thread in a program. The JVM
provides an application to execute the multiple thread running
concurrently in an application.
Get Length of Array
Array is defined as data of similar data type. It is defined as data storage
method to store information. A array is considered as a group of
object with the common attribute.
Java Get Last Line of File
In This Tutorial we want to describe you a code that helps you in understanding
Get Last Line of File in Java . For this we have a class name "Get Last Line
of File".
Get Java Version
The Java has a lot changes since JDK1.0 as well as
numerous additions of classes and packages. In addition to this class and
package ,Java introduced class standard libraries.
Get File Size
In this Tutorial, we want to describe you a code that helps you in
understanding Get File Size.
Show random number
Random Number is the set of unordered arranged number. The class Random
is derived from java.util.Random.An instance of Random class is used to
provide you a stream of pseudorandom number.
Fetch
Property by Name
In this Tutorial we want to describe you a code that helps you in
understanding to get Property by Name. For this we have a class name "Get
Property By Name".
Show
current directory
In this Tutorial we want to describe you a code that helps you in
understanding Get Current Directory. For this we have a class name CurrentDir,
Inside the main method we create an instance file1 and file2 of file
class by using new operator.
Current
time in Java
Format is an abstract class that is used for formatting local-sensitive
information like date, number and message. The Format class derived from
the package java.text.format.
Java get
time zone
Time Zone class inherits from a Java.util.time zone. This class represents a
time zone offset. The Time zone gives you a specific time zone of a specific
locale where the program is running.
Java get
time and date
The Class Date
provides you a specific instant in
time( millisecond) precision. This class enabled you to interprets
allowed dates as year, month, day, hour, minute, and second values and
date formatting and parsing of date string.
System IP
address
The System IP address is a unique numerical identification
assigned to a different system involved in the network for communication. The
Format for a IP address is a 32- bit numeric address written as four number separated
by periods i.e 192.168.1.1 is an example of IP address.
Tomorrow
date
In this Tutorial we want to describe you a code that help you in
understanding Get Tomorrow Date. For this we have a class name
GetTomorrowDate.Inside the main method we have a variable name string s,Date date, Format
formatter.
Last day of the month
Calendar class inherits from Java.util.calendar.Calendar
is base abstract class, that is used for converting between a Date
object and a set of integer fields such as YEAR
, MONTH
,
DAY
, HOUR
.. A Date
object specific
instant in time with millisecond.
Get Month Name
In this Example we want to describe you a code that help you in understanding
a how to get a 'Get Month Name Example'.For this we have a class name 'GetMonthNameExample'.
Input From Console
The Console Class inherits from Java.io.console and implements flushable interface. The
Input from Console is used to access the character -based console device
associated with the current Java virtual machine.
Get local host name
In this Example we want to describe you a code that helps you in
understanding a code how to 'Get Local Host Name'. For this we have a class name
GetLocalHostName.
Java binary to decimal
In this Tutorial we want to describe you a code that help you in
understanding a how to get a 'Java binary to decimal'.
Get int from string
In this section, you will study how to obtain the integer value from String.
For this, we have defined a string. The method Integer.parseInt(st)
converts the string into the integer.
Absolute Path
information is required
In this section, you will study how to obtain the absolute path of a
particular file. For this, we have define a file 'MainClass.java'. The method
file.getAbsolutePath() returns the absolute path of the given file.
Elapsed Time in java
In this section, you will study how to obtain the elapsed time. As you all
know that the Elapsed time is the time taken to complete the process. In the
given example, we have used the method System.nanoTime() to get the start
time and the end time of the defined process.
Get File Type
This section illustrates you how to get the file type. In the given example,
we have create an instance of the class File and passed the file 'Hello.txt' to
the constructor of this class.
File Timestamp
The following example shows the modification date and time of the specified file.
The class Runtime provides the runtime environment. The class BufferedReader
reads the file from the console and the method runtime.exec("cmd/c
dir" +fname) executes the process.
Array
map in JavaScript
In this Tutorial we want to describe you a code that help you in
understanding JavaScript array map. For this we are using a JavaScript language as
script language.
Clone in java example
Java clone method is used to present the duplication of object in the Java
programming language. The Java objects are manipulated through
reference variables, we don't have any way to copy an object in java.
Java binary tree insert
The Binary Tree insert is specialized use of binary tree. The concept lies
behind is that all the element value less than the root node value insert left
to the root node and the element value greater than the root node insert right
to this root node.
Binary tree
coding
Binary Tree are the specialized tree that has two possible branches i.e left
and right branch. These tree are useful when you build a parse of tree
especially in mathematics and Boolean.
Use of Local Inner class
The Java language enables you to define a class inside another class. Such a
class is defined as Nested Class or Local Inner class.
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