Sweety C Sanford

In Flow Control......

Hi all,

I have cleared SCJP with 98% .Only one question went wrong out of 72 questions.Thanks for this wonderful forum and the members coz of this i have got quick explanations to the doubts.The explantions here are simple and easy to understand.Keep up the good work.

Regards,
Sweety C

Sorry..Dint Look into the topic...Anyway thanks for moving it.Hope to get an quick reply.

Hi all,

import java.util.ArrayList;
import java.util.List;

class A1 {}
class B1 extends A1 {}
class C1 extends A1 {}
class D1 extends B1 {

List<?> l = new ArrayList<Object>();
List<? extends B1> m = new ArrayList<D1>();
#List<? extends A1> n = new ArrayList<? extends B1>();

}

In the above code the commented line gives compilation failure but it is expected to be successful.Can anyone help me out in this?

Thanks in advance,
Jesu

OOPs The mistake i was doing is i have not given the filname with extension.
The below code executes perfect.

import java.io.File;
public class Test {

public static void main(String... args) throws Exception {
File myDir = new File("test");
myDir.mkdir();
File myFile = new File("myDir","test1.txt");
myFile.createNewFile();
}

}

Thanks I got it

createNewFile() method creates an actual file.

I have modified my code like this

public class Test {

public static void main(String... args) throws Exception {
File myDir = new File("test");
myDir.mkdir();
File myFile = new File(myDir,"test1");
myFile.createNewFile();
}

}

Even now Cribbing

Hi all,

public class Test {

public static void main(String... args) throws Exception {
File myDir = new File("test");
// myDir.mkdir();
File myFile = new File(
myDir, "test.txt");
myFile.createNewFile();
}

}

What is the mistake i'm doing here?
It throws me the following exception :

Exception in thread "main" java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(Unknown Source)
at Files.Test.main(Test.java:11)

Thanks,
Jesu

Whenever you create an instance of a FileReader, a FileWriter, a PrintWriter, a FileInputStream, or a FileOutputStream classes, you automatically create a file, unless one already exists.


Anything else go ahead and add it .

Hi all,

What are the ways to create an actual file?

Please pour in your ideas.

Thanks in advance,
Jesu