Problems with "renameTo" - method in the File class

[iHank]

Hello!

Consider the following code:

public class TestUppgift1 {
 
    public static void main(String [] arg) {
 
        Scanner sc = new Scanner(new InputStreamReader(System.in));
        String katalog = "";
        File fil0 = new File("C:\\Hej\\a");
        File fil02 = new File("C:\\Hej\\b");
        File fil = new File(fil0, "hejsan.txt");
        File fil2 = new File(fil02, "dal.txt");
        if(fil.exists()) {
 
            System.out.println("Du har fattart!");
 
            if(fil2.exists()) {
 
                if(fil.renameTo(fil2)==true) {
                    System.out.println(fil.getName());
                }
 
 
            }
        }
    }
 
}

Why can't I rename fil?

Hank

[Tjones787]

Hi, kindly tell us, what error are you getting when you run the program.

[iHank]

I don't get an error at all. The renameTo - method return false.

Hank

[Tjones787]

When you print the name of the file. What was your output

--- Update ---

renameTo method return a true or false argument to tell you if the file was successfully renamed

[andbin]

            if(fil2.exists()) {
 
                if(fil.renameTo(fil2)==true) {

From javadoc documentation of renameTo: "it might not succeed if a file with the destination abstract pathname already exists"

If fil2.exists() is true, you are exactly in the condition stated above!

[iHank]

From javadoc documentation of renameTo: "it might not succeed if a file with the destination abstract pathname already exists"

If fil2.exists() is true, you are exactly in the condition stated above!

Thank you! Now I understand the renameTo-method.

Hank