Command Line Arguments | Core Java Tutorial | Minigranth
Command Line Arguments : Introduction
Arguments that are passed to the program when we run it are called command line arguments.
Now this is the time to use the String argsparameters in main().
Command line arguments are given from command line following the program name at the time of running it.
Command line arguments are stored as String array that is passed as parameter in main().
Command Line Arguments : The Discussion
We can give any number of arguments from the command line and they are stored in an array format like args for the first argument, args for the second ,……..args[n-1] for nth argument.
Still Confused? Let us try to explain the concept of command line arguments with an example. Let’s add n numbers by using command line arguments.
Command Line Arguments : Example
Command Line Arguments : Output
In the above output we can see that 10, 20, 30, 40, 50 are command line arguments and output shows their sum.
In Java objects are dynamically allocated, and after their use they need to be destroyed to free up the memory space. In Java object de-allocation is done automatically, this technique of de-allocating objects is called garbage collection.
Now the question arises, how Java decides which object to de-allocate. When no reference to an object exists, that object is de-allocated and the memory is freed.
Garbage collector program check for the non-referenced object time to time and de-allocates them when it finds one.
In other programming languages like C++, one has to define a destructor to destroy or de-allocate the object , but this is done automatically in Java.