Find Method Sign Line Number

package java9;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.regex.Pattern;

public class TTT {

    public static void main(String args[]) throws IOException {

        List<String> readAllLines = Files.readAllLines(Paths
                .get("/Users/hongtaowang/git/spring-boot-jpa-demo/src/main/java/com/my/app/web/IndexController.java"));

        int issueLine = 29;

        String preMethodSignNumber = getPreMethodSignNumber(issueLine, readAllLines);

        System.out.println(preMethodSignNumber);

        String preSignEndChar = getPreSignEndChar(readAllLines, issueLine);

        System.out.println(preSignEndChar);

    }

    private static String getPreSignEndChar(List<String> readAllLines, int issueLine) {
        int nextMethodSignLine = getNextMethodSignNumber(issueLine, readAllLines);

        for (int endLineNumber = nextMethodSignLine - 1; endLineNumber > 0; endLineNumber--) {
            String endChar = readAllLines.get(endLineNumber - 1);

            if (endChar.contains("}")) {
                return (endLineNumber) + " end     line " + endChar;
            }

        }

        return "";
    }

    private static int getNextMethodSignNumber(int i, List<String> readAllLines) {
        int j = i;
        for (; j < readAllLines.size(); j++) {
            String p = readAllLines.get(j - 1);
            boolean extracted = matchMethodSign(p);
            if (extracted) {
                break;
            }

        }
        return j;
    }

    private static String getPreMethodSignNumber(int currentLine, List<String> readAllLines) {
        for (int preLine = currentLine - 1; preLine > 0; preLine--) {
            String preLineSource = readAllLines.get(preLine - 1);

            if (matchMethodSign(preLineSource)) {
                return (preLine) + " end     line " + preLineSource;
            }

        }

        return "";
    }

    private static boolean matchMethodSign(String d) {
        String pattern = ".*[A-z].* .*[A-z1-9]\(.*";
        boolean isMatch = Pattern.matches(pattern, d);
        if (!isMatch) {
            return false;
        }

        if (d.contains("return")) {
            return false;
        }

        if (d.contains("=")) {
            return false;
        }

        return true;
    }

}