in JAVA, why my code can run, but it does not show any files on my desktop. Scan

Question

in JAVA, why my code can run, but it does not show any files on my desktop.

Scanner k = new Scanner(System.in);
System.out.println(" Please enter the first filename: ");
String fileName1 = k.nextLine();
System.out.println(" Please enter the second filename: ");
String fileName2 = k.nextLine();
File f1 = new File(fileName1);
Scanner file1 = new Scanner(f1);
PrintWriter f2 = new PrintWriter(fileName2);
  
while(file1.hasNext()){
String str= fileName1.toUpperCase();
f2.println(str.toUpperCase());
}
file1.close();
f2.close();
}

Explanation / Answer

I made some changes and succefully it is showing all the files on desktop.You can see the changes in following code

import java.util.*;

import java.io.*;

class FileDemo

{

public static void main(String args[])

{

try

{

Scanner k = new Scanner(System.in);

System.out.println(" Please enter the first filename: ");

String fileName1 = k.nextLine();

System.out.println(" Please enter the second filename: ");

String fileName2 = k.nextLine();

PrintWriter f1 = new PrintWriter(new File(fileName1));

PrintWriter f2=new PrintWriter(new File(fileName2));

Scanner file1=new Scanner(new File(fileName1));

String str;

while(file1.hasNext())

{

str= fileName1.toUpperCase();

f2.println(str.toUpperCase());

}

f1.close();

f2.close();

}

catch(Exception e1)

{

System.out.println(e1);

}

}

}

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