Lab Task

package labtask9;

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Labtask9 {

    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        String Input = scn.nextLine();
        if (declaration(Input)) {
            System.out.println("This is a declaration statement");
        } else if (Mathop(Input)) {
            System.out.println("This is a Math Operation statement");
        } else if (Digit(Input)) {
            System.out.println("This is a Digit statement");
        } else if (Digits(Input)) {
            System.out.println("This is DIgits statement");
        } else if (datatype(Input)) {
            System.out.println("This is Dstatype statement");
        } else if (logicalOp(Input)) {
            System.out.println("This is logicalOp statement");
        }else if (identifier(Input)) {
            System.out.println("This is Identifier statement");
        }else {
            System.out.println("This is Invalid statement");
        }

    }

    public static boolean declaration(String Inp) {
        String regexInt = "((int)(\\s+)([_a-zA-Z][_a-zA-Z0-9]*)(\\s*)(=)(\\s*)([0-9]+);)|";
        String regexfloat = "((float)(\\s+)([_a-zA-Z][_a-zA-Z0-9]*)(\\s*)(=)(\\s*)([0-9]+)(.)([0-9]+);)|";
        String regexString = "((String)(\\s+)([_a-zA-Z][_a-zA-Z0-9]*)(\\s*)(=)(\\s*)([\\w\\W\\s]*);)|";
        String regexChar = "((char)(\\s+)([_a-zA-Z][_a-zA-Z0-9]*)(\\s*)(=)(\\s*)([\\w\\W\\s]);)";

        boolean matches = regexChecker(regexInt + regexfloat + regexString + regexChar, Inp);
        return matches;

    }

    public static boolean Mathop(String Inp) {

        boolean matches = regexChecker("\\+|\\*|\\/|\\-", Inp);
        return matches;

    }

    public static boolean Digit(String Inp) {

        boolean matches = regexChecker("(\\d)", Inp);
        return matches;

    }

    public static boolean Digits(String Inp) {

        boolean matches = regexChecker("(\\d)+", Inp);
        return matches;

    }

    public static boolean datatype(String Inp) {

        boolean matches = regexChecker("(int)|(float)|(String)|(char)|(boolean)|(double)", Inp);
        return matches;

    }

    public static boolean logicalOp(String Inp) {

        boolean matches = regexChecker("&&|\\|||", Inp);
        return matches;

    }

    public static boolean identifier(String Inp) {

        boolean matches = regexChecker("([_a-zA-Z][_a-zA-Z0-9]*)", Inp);
        return matches;

    }

    public static boolean InvalidIP(String Inp) {

        boolean matches = regexChecker("^([_a-zA-Z][_a-zA-Z0-9]*)", Inp);
        return matches;

    }



    public static boolean regexChecker(String theRegex, String Input) {

        Pattern checkRegex = Pattern.compile(theRegex);

        Matcher regexMatcher = checkRegex.matcher(Input);
        int count = 0;
        boolean matches = false;

        while (regexMatcher.matches()) {
            if (regexMatcher.group().length() != 0) {
                //String inp= regexMatcher.group().replaceFirst("(int)|(float)|(String)|char", "");
                //System.out.println( Input.trim() );
                count++;
                matches = true;
                return matches;
            }

            System.out.println();

        }
        if (count == 0) {
            matches = false;

            return false;
        }
        return false;
    }
}