How System Out Println Is An Important Part Of Java Application Development?

By Author: Dharmesh Aegis
Total Articles: 105
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Often known as SOP, this is one of the most used compiled statements in Java application development. This statement system.out.println helps in printing the argument that will be passed into the system.out, which is stdout.
System:

This is a final class and it cannot be instantiated. This means that all the members including methods and fields have to be static and will be regarded as an utility class.
Out:

This is a static member field, which forms part of System class and is of type PrintStream. Java developers in India are aware that the access specifies are regarded as pubic final. This means it gets instantiated during the startup and also gets mapped along with the standard output console belonging to the host. This stream gets opened immediately after the instantiation takes place and accepts data readily. It is the standard console that most Java developers in India use when running a program from windows command line.
Println:

println is a command that is part of java application development and prints the argument ...
... that is passed to the standard console and a newline. There are multiple println methods that include different arguments. Every println creates a call to print method and then adds a newline.
How Java developers in India can change out of system.out.println?
Out gets initialized at startup by java runtime environment and java developers in India can modify it during execution. When a program is run through command line, the output is printed on the same command window. Java application development team can modify this behaviour through the usage of setOut method.
Difference between system.out.println and loggers such as Log4j
Log4J features multiple levels for logging. Most Java developers in India are aware that development of a software project requires professional logger and it is better to avoid SOPs. There are reasons on why professional loggers are preferred and some of them include:
Flexibility:

Professional logger such as log4j offers different levels for logging, which means that the log message can be divided.
Maintenance: If there are hundreds of SOPs throughout the application, it becomes difficult to manage the program over certain duration of time.
Configurability:

Through a change in just one parameter, it is possible to switch off all the logging statements.
Granular:

In a Java development application, it is possible for every single class to have a different logger and be controlled and managed accordingly.
Utility:

In system.out, the option of redirecting the message is limited but in professional logger there are appenders that helps provide innumerable options. It is also possible to generate a custom output option and redirect it to it too.
Though there are many advantages associated with professional loggers, it does not imply that system.out.println should not be used. There seems to be a notion that SOPs are bad, but when analyzed, the result is that Java application development team can use it in certain cases and one has to be prudent about where it should be used.
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