java - How to move up lines in a .txt file with BufferedReader? -

making "assembler" program cs course enrolled in. has functions add, set, inc (increment), , jig. now, inputing .txt file following layout (as example):

keep note: , b integer's store value throughout program, , print out value once reaches end of text file.

inc    (increments 1) set b 5   (set's b's value 5) inc b add 3  (add's 3 a's current value) jig b -4 (move's backward 4 lines, inc a) 

so confused how move bufferedreader 4 lines? there method in bufferedreader lets move index/position? otherwise, how else can accomplish this?

the simplest thing store lines in array or list.

list<string> lines = files.readalllines(paths.get("myfile.txt")); 

this allow progress line @ random.

to line can use lines.get(n) example can do

int pointer = 0; for(boolean running = true; running && pointer < lines.size(); ) {    string line = lines.get(pointer);    string[] parts = line.split(" +");    switch(part[0]) {       case "jmp":           pointer += integer.parseint(parts[1]); // jump or forth.           continue;       case "halt":           running = false;           break;       // other instructions    }    pointer++; }