Three In A Row Solver, Java

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import java.util.*;
import java.lang.*;

class Rextester
{  
    // Requires possible initial board to be set by user
    public static void main(String args[])
    {
        // 1 = Blue, 
        // 0 = White, 
        //'-'= Empty
        String[] board = {
            "1---1-", 
            "---11-", 
            "--11--", 
            "0-----", 
            "------", 
            "-0----"
        };
        
        /*
            "------", 
            "------", 
            "------", 
            "------", 
            "------", 
            "------"
        */
        
        // Print initial board preset
        printBoard(board);
        
        // Solve lines in board until full...
        for (int in = 0; in < 6; in++) {
            
            // Solve Rows
            for (int s = 0; s < board.length; s++) {
                // Solve each horizontal line (row)
                board[s] = solveLine(board[s]);
            }

// Solve Columns
            for (int s = 0; s < 6; s++) {
                // Compile a column, taking chars from lines
                String i = "";
                for (String j : board) {
                    i += j.charAt(s);
                }
                
                // Solve the line
                i = solveLine(i);
                
                // Place solved line back into board
                for (int j = 0; j < 6; j++) {
                    StringBuilder o = new StringBuilder(board[j]);
                    o.setCharAt(s, i.charAt(j));
                    board[j] = o.toString();
                }
            }
            
            // Show step...
            printBoard(board);
        }
        
        // Print out final "solved" board
        System.out.println("--------------");
        printBoard(board);
    }
    
    private static String solveLine(String i) {
        // Fill in rest if 3 blue/white pieces are set
        if (i.length()-i.replaceAll("1", "").length() == 3) {
            i = i.replaceAll("-", "0");
        } else if (i.length()-i.replaceAll("0", "").length() == 3) {
            i = i.replaceAll("-", "1");
        }
        
        // E.g. 1-1---  =>  101---
        i = i.replaceAll("1-1", "101");
        i = i.replaceAll("0-0", "010");
        
        // E.g. -11---  =>  0110--
        i = i.replaceAll("11-", "110");
        i = i.replaceAll("00-", "001");
        i = i.replaceAll("-11", "011");
        i = i.replaceAll("-00", "100");
        
        // E.g. 1-0--1  =>  100101
        i = i.replaceAll("1.0..1", "100101");
        i = i.replaceAll("1..0.1", "101001");
        i = i.replaceAll("0.1..0", "011010");
        i = i.replaceAll("0..1.0", "010110");
        
        // E.g. -10--1  =>  010--1
        i = i.replaceAll("-10(?=..1)", "010");
        i = i.replaceAll("-01(?=..0)", "101");
        i = i.replaceAll("(?<=1..)01-", "010");
        i = i.replaceAll("(?<=0..)10-", "101");
        
        // E.g. 1---1-  =>  1---10
        i = i.replaceAll("-1(?=...1)", "01");
        i = i.replaceAll("-0(?=...0)", "10");
        i = i.replaceAll("(?<=1...)1-", "10");
        i = i.replaceAll("(?<=0...)0-", "01");
        
        // E.g. 1----1  =>  10--01
        i = i.replaceAll("1----1", "10--01");
        i = i.replaceAll("0----0", "01--10");
        
        // E.g. 110---  =>  110--0
        i = i.replaceAll("-(?=..011)", "0");
        i = i.replaceAll("-(?=..100)", "1");
        i = i.replaceAll("(?<=110..)-", "0");
        i = i.replaceAll("(?<=001..)-", "1");
        
        
        return i;
    }
    
    private static void printBoard(String[] bo) {
        System.out.println("\n");
        for (String b: bo) {
            System.out.println(b.replaceAll("", " "));
        }
    }
}

[ + ] Show input
Compilation time: 1.45 sec, absolute running time: 0.77 sec, cpu time: 0.93 sec, memory peak: 23 Mb, absolute service time: 2,23 sec