Exe Patching Problem

Processing Coding Questions
1

I get so many errors for no reason…
(Reason: i did not initilaze a custom class :man_facepalming:)

Code

Main:

byte[] bExe;
String[] midpatch;
Patch finpatch;

void setup() {
  selectOutput("Save the output file:", "fileOut");
  selectInput("Select the file:", "fileSel");
  selectInput("Select the patch:", "patchSel");
}

void patchSel(File inpatch) {
  midpatch = loadStrings(inpatch);
  finpatch.convert(midpatch);
}

void fileSel(File exe) {
  bExe = loadBytes(exe);
}

void fileOut(File out) {
  println(out.getName());
  //finpatch.apply(bExe, /*out.isDirectory()+*/out.getName());
}

Patch:

class Patch {
  int[] adr;
  byte[] num;
  int len;
  void convert(String[] midpatch) {
    //String[] temp = new String[2];
    //println("Length of patch: " + midpatch.length);
    //adr = new int[midpatch.length];
    //num = new byte[midpatch.length];
    //len = midpatch.length;
    //for (int i=0;i<len;i++) {
    //  temp = split(midpatch[i],":");
    //  adr[i] = int(temp[0]);
    //  num[i] = byte(int(temp[1]));
    //}
  }
  void apply(byte[] byt, String name) {
    byte[] bt = byt;
    for (int i=0;i<len;i++) {
      bt[adr[i]]=num[i];
    }    saveBytes(name, bt);
    printArray(bt);
  }
}