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import java.io.*;
class TestExist
{

  public static void main ( String[] args ) 
  {
    String pathName;
    
    if ( args.length == 1 ) 
      pathName = args[0];
    else
      pathName = "";

    File   test = new File( pathName );

    if ( test.exists() )
      System.out.println( "The file " + pathName + " exists." );
    else
      System.out.println( "The file " + pathName + " Does Not exist." );
  }

}

The File constructor does not throw IOExceptions. The path name is not checked to see if it exists.

The example program (above) has been changed so that the file name comes from the command line. The File constructor does throw a NullPointerException if the argument is null, but this is an unchecked exception and need not be caught

Try running it with a variety of arguments on the command line, with both file names and directory names. Here are some examples. Some arguments are relative path names, others are absolute pathnames, and some are directory names.

C:\JavaSource>java  TestExist TestExist.java
The file TestExist.java exists.

C:\JavaSource>java  TestExist ..\JavaSource
The file ..\JavaSource exists.
 

C:\JavaSource>java  TestExist C:\Temp
The file C:\Temp exists.

C:\JavaSource>java  TestExist C:\glarch.txt
The file C:\glarch.txt Does Not exist.

Answer:

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QUESTION 5: