java – VDonC#ev

How to fill matrix in spiral order Java

public class SpiralMatrix {
    public static void main(String[] args) {
        int[][] matrix = new int[7][7];
        int top = 0;
        int bottom = matrix.length - 1;
        int left = 0;
        int right = matrix[0].length - 1;
        int index = 1;

        while (left <= right && top <= bottom) {
            for (int col = left; col <= right; col++) {
                matrix[top][col] = index++;
            }

            top++;
            for (int row = top; row <= bottom; row++) {
                matrix[row][right] = index++;
            }

            right--;
            for (int col = right; col >= left ; col--) {
                matrix[bottom][col] = index++;
            }

            bottom--;
            for (int row = bottom; row >= top ; row--) {
                matrix[row][left] = index++;
            }

            left++;
        }


        for (int row = 0; row < matrix.length; row++) {
            for (int col = 0; col < matrix[0].length; col++) {
                System.out.printf("%02d ", matrix[row][col]);
            }
            System.out.println();
        }
        
        // result:
        // 01 02 03 04 05 06 07
        // 24 25 26 27 28 29 08
        // 23 40 41 42 43 30 09
        // 22 39 48 49 44 31 10
        // 21 38 47 46 45 32 11
        // 20 37 36 35 34 33 12
        // 19 18 17 16 15 14 13
    }
}

How to convert letter char to its alphabet integer position in Java

public class LetterToAlphabetPos {
    public static void main(String[] args) {
        char letter = 'Z';
        System.out.println(letterToAlphabetPos(letter)); // returns 26
    }

    private static int letterToAlphabetPos(char letter) {
        return Character.toUpperCase(letter) - 64;
    }
}

How to generate Eratosthenes sieve in Java

public class EratosthenesSieve {

    public static final int MAX = 121;

    public static void main(String[] args) {
        boolean[] primes = new boolean[MAX];
        eratosthenesSieve(primes);

        System.out.printf("Primes in range [2..%d] are: ", MAX);
        for (int i = 2; i < MAX; i++) {
            if(primes[i]) {
                System.out.printf(i + " ");
            }
        }
    }

    private static void eratosthenesSieve(boolean[] primes) {
        for (int i = 2; i < primes.length; i++) {
            primes[i] = true;
        }

        for (int i = 2; i < Math.sqrt(MAX); i++) {
            if (primes[i]) {
                for (int j = i * i; j < MAX; j += i) {
                    primes[j] = false;
                }
            }
        }
    }
}

How to print list separated by comma in Java

import java.util.ArrayList;
import java.util.stream.Collectors;

public class CommaDelimeter {
    public static void main(String[] args) {
        ArrayList<Integer> collectNums = new ArrayList<Integer>();
        collectNums.add(2);
        collectNums.add(9);
        collectNums.add(12);

        String joined = collectNums.stream()
                .map(Object::toString)
                .collect(Collectors.joining(", "));

        System.out.println(joined);
    }
}

How to generate random integer in range in Java

import java.util.Random;

public class RandomNumInRange {
    public static void main(String[] args) {
        int min = 10;
        int max = 20;

        Random rand = new Random();
        int randNum = rand.nextInt((max - min) + 1) + min;
        System.out.print(randNum);
    }
}

How to split by forward or/and back slash in Java using RegEx

public class MatchBackslashRegex {
    public static void main(String[] args) {
        String string = "Element1\\Element2";
        String[] strArr = string.split("/\\\\");
        System.out.println(strArr[0]); // returns Element1
    }
}

How to reverse String in Java

public class ReverseString {
    public static void main(String[] args) {
        String a = "Test";
        String aReversed = new StringBuilder(a).reverse().toString();
        System.out.println(aReversed); // returns tseT
    }
}