I have implemented a class that should compress or expand binary input from standard input using run-length encoding. I have fixed all of the errors that were flagged by my IDE, but when I actually run it I get an error.
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at runlength.RunLength.main(RunLength.java:49)
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)
In the code, line 49 is the following:
switch (args[0]) {
here is the full code:
package runlength;
import edu.princeton.cs.introcs.BinaryStdIn;
import edu.princeton.cs.introcs.BinaryStdOut;
public class RunLength {
private static final int R = 256;
private static final int lgR = 8;
public static void expand() {
boolean b = false;
while (!BinaryStdIn.isEmpty()) {
int run = BinaryStdIn.readInt(lgR);
for (int i = 0; i < run; i++)
BinaryStdOut.write(b);
b = !b;
}
BinaryStdOut.close();
}
public static void compress() {
char run = 0;
boolean old = false;
while (!BinaryStdIn.isEmpty()) {
boolean b = BinaryStdIn.readBoolean();
if (b != old) {
BinaryStdOut.write(run, lgR);
run = 1;
old = !old;
}
else {
if (run == R-1) {
BinaryStdOut.write(run, lgR);
run = 0;
BinaryStdOut.write(run, lgR);
}
run++;
}
}
BinaryStdOut.write(run, lgR);
BinaryStdOut.close();
}
public static void main(String[] args) {
switch (args[0]) {
case "-":
compress();
break;
case "+":
expand();
break;
default:
throw new IllegalArgumentException("Illegal command line argument");
}
}
}
If anyone can explain to me what my problem is, I would really appreciate it.