Why this code don't work?

[artemff]

Why this code don't work:

.......
import javax.microedition.io.*;
......
......
String filename;
BufferedReader in = new BufferedReader(new FileReader(filename));
.....

In NetBeans IDE 5.0.
Error: cannot find symbol...

[Fubarable]

Have you downloaded the microedition SDK? Have you set up your NetBeans IDE to recognize it?

[artemff]

Fubarable, how set up NetBeans IDE to recognize it?

[Pixio]

String filename;
BufferedReader in = new BufferedReader(new FileReader(filename));

If there is no code between these lines, it's error maybe because u haven't initialized filename yet? String filename points to null.

[cselic]

first initialize filename.
second write code for file not found exception.

code will look something like that:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;

.....

String filename= "input.txt";
try {
BufferedReader in = new BufferedReader(new FileReader(filename));
} catch(FileNotFoundException exception) {
exception.printStackTrace();
}

for practice I wrote a little class:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;

public class BaferedExample {
	public BaferedExample() {
		
	String filename= "input.txt";
	try {
	BufferedReader in = new BufferedReader(new FileReader(filename));
	} catch(FileNotFoundException exception) { 
		exception.printStackTrace(); 
		}
	}
}

[Eranga]

Fubarable, how set up NetBeans IDE to recognize it?

That package is a non-standard package. So you've to import it into your project. Actually added in class path. Did you do that?

[Eranga]

String filename;
BufferedReader in = new BufferedReader(new FileReader(filename));

If there is no code between these lines, it's error maybe because u haven't initialized filename yet? String filename points to null.

Actually that's lead to NullPointerException, not to cannot find symbol .....

It could rise due to two reason. Variable use without declaring, and use of additional package resources (actually this is same as use of variables without declaring in depth)