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A Closer Look at Methods and Classes


Have you ever wanted to get an in-depth understanding of methods and classes in Java? Look no further. This article is excerpted from chapter 7 of Java: the Complete Reference, J2SE 5 Edition, written by Herbert Schildt (McGraw-Hill/Osborne, 2004; ISBN: 0072230738). 

Author Info:
By: McGraw-Hill/Osborne
Rating: 4 stars4 stars4 stars4 stars4 stars / 22
June 30, 2005
TABLE OF CONTENTS:
  1. · A Closer Look at Methods and Classes
  2. · Overloading Constructors
  3. · Using Objects as Parameters
  4. · A Closer Look at Argument Passing
  5. · Returning Objects
  6. · Recursion
  7. · Introducing Access Control
  8. · Understanding static
  9. · Introducing final
  10. · Introducing Nested and Inner Classes
  11. · Exploring the String Class
  12. · Using Command-Line Arguments

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A Closer Look at Methods and Classes - Using Command-Line Arguments
(Page 12 of 12 )

Sometimes you will want to pass information into a program when you run it. This is accomplished by passing command-line arguments to main( ). A command-line argument is the information that directly follows the program’s name on the command line when it is executed. To access the command-line arguments inside a Java program is quite easy—they are stored as strings in the String array passed to main( ). For example, the following program displays all of the command-line arguments that it is called with:

// Display all command-line arguments.
class CommandLine {
  public static void main(String args[]) {
    for(int i=0; i<args.length; i++)
      System.out.println("args[" + i + "]: " +
                          args[i]);
  }
}

Try executing this program, as shown here:

java CommandLine this is a test 100 -1

When you do, you will see the following output:

args[0]: this
args[1]: is
args[2]: a
args[3]: test
args[4]: 100
args[5]: -1

Remember  All command-line arguments are passed as strings.
                 You must convert numeric values to their internal
                 forms manually, as explained in Chapter 14.


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