Center text across multiple signs

gistfile1.txt

for(String[] msg:messagequeue){
            int x = getSignMidPoint()[1] - (msg.length / 2);
            int lineno = x%3;
            x = x / 4;
            System.out.println(x);
            for(int a = msg.length-1; a>-1;a--){
                int y = getSignMidPoint()[0] - (msg[a].length() / 2);

                System.out.println(msg[a]);
                char[] line = msg[a].toCharArray();
                for(int b = 0;b<line.length;b++){

                    System.out.println(y/16+" "+x/4+" "+(3-x)%4+" "+x);
                    Sign sig = signs [x][((y)/16)];
                    sig.setLine(lineno,sig.getLine(lineno)+line[b]);
                    System.out.println(sig.getLine(x%4));
                    signs [x][((y)/16)].update();

                    y++;
                }
                if(lineno == 0){
                    lineno = 3;
                    x++;
                }
                else
                    lineno--;


            }
        }