Problem with IO objects...variable might not have been initialized?
I dont get why its wrong, i've initialized both objects and variables, i dont know why it gives me that error T__T.
Program is supposed to compare both text archives and see if they are equal in a byte per byte way.
import java.io.*;
publicclass TestIO
{
publicstaticvoid main(String[] args)
throws IOException{
int i = 0, j = 0;
FileInputStream data1;
FileInputStream data2;
try{
try
{
data1 =new FileInputStream(args[0]);
}catch(FileNotFoundException exc){
System.out.println(args[0] +" File Not Found!");
return;
}
try
{
data2 =new FileInputStream(args[1]);
}catch(FileNotFoundException exc){
System.out.println(args[1] +" File Not Found!");
return;
}
}catch(ArrayIndexOutOfBoundsException exc){
System.out.println("Usage: java TestIO File1.java File2.java");
}
try{
do{
i = data1.read();
j = data2.read();
if(i != j)break;
}while(i != -1 && j != -1);
}catch(IOException exc){
System.out.println("File Error!");
}
if (i != j)
{
System.out.println("Files Differ");
}
else
{
System.out.println("Files are the same");
}
data1.close();
data2.close();
}
}
Help is appreciated, thanks in advance ^_^ .
[3103 byte] By [
Rix87a] at [2007-11-27 8:47:47]
import java.io.*;
public class FileDiff {
public static boolean diff(File file1, File file2) throws IOException {
BufferedInputStream in1 = new BufferedInputStream(new FileInputStream(file1));
try {
return diff(in1, file2);
} finally {
in1.close();
}
}
public static boolean diff(InputStream in1, File file2) throws IOException {
BufferedInputStream in2 = new BufferedInputStream(new FileInputStream(file2));
try {
return diff(in1, in2);
} finally {
in1.close();
}
}
public static boolean diff(InputStream in1, InputStream in2) throws IOException {
int b1, b2;
while ((b1 = in1.read()) != -1 & (b2 = in2.read()) != -1 ) {
if (b1 != b2)
return true;
}
return b1 != b2;
}
public static void main(String[] args) {
if (args.length != 2) {
System.err.println("Usage: java FileDiff file1 file2");
} else {
try {
System.out.println(diff(new File(args[0]), new File(args[1])));
} catch(IOException e) {
System.out.println(e.getMessage());
}
}
}
}
Yea, thanks for that code that i don't understand much due to my newbiness on java :D .
I was expecting more of like a simple fix on my code, since its almost all good, except for those "variable...bla-bla" annoying errors that i just can't figure out why it's wrong T_T .
But it's alright if it can't be solved the way i want it to be!
Anyways, thanks in advance for at least viewing the problem i'm posting ^_^ .
Rix87a at 2007-7-12 20:53:29 >
> Yea, thanks for that code that i don't understand
> much due to my newbiness on java :D .
Here's a simple example.
Object o = null;
if(someCondition)
{
o = new Object();
}
System.out.println(o.toString());
In this code snippet, if someCondition is false, then o will not get initialized, which will cause a NPE in the last line. This is why your compiler is complaining.
