ConditionsLoopsTask1DigitsPrinter.java

package HomeWorkSecond;

/**
 * Created by Andrey on 06.01.2016.
 */
public class ConditionsLoopsTask1DigitsPrinter {

    public static final int RADIX = 10;

    public static void main(String[] args) {
        int n = -147292;
        outputDigits(n);
    }

    public static void outputDigits(int n) {
        indexChecker(n);
        int absN = Math.abs(n);
        for (int i = getLength(absN); i > 0; i--) {
            System.out.print(getNumb(absN, i) + " ");
        }
    }

    public static Object getNumb(int n, int i) {
        i--;
        int numb = ((n / getPow(i)) % RADIX);
        return numb;
    }

    public static int getPow(int i) {
        int pow = (int) Math.pow(RADIX, i);
        return pow;
    }


    public static int getLength(int n) {
        int length = 0;
        while (n > 0) {
            length++;
            n /= RADIX;
        }
        return length;
    }

    public static void indexChecker(int n) {
        if (n < 0) System.out.print("- ");
        return;
    }
}

ConditionsLoopsTask2RadixPrinter.java

package HomeWorkSecond;

/**
 * Created by Andrey on 07.01.2016.
 */
public class ConditionsLoopsTask2RadixPrinter {

    public static final int RADIX_TEN = 10;

    public static void main(String[] args) {
        int n = 147292;
        int radix = 10;
        printInRadix(n, radix);
    }

    public static void printInRadix(int n, int radix) {
        checker(n, radix);
        int count;
        String temp = "";
        while (n != 0) {
            count = n % radix;
            temp = count + temp;
            n = n / radix;
        }
        System.out.print(temp);
    }

    public static void checker(int n, int radix) {
        if (n < 0) throw new IllegalArgumentException("Your digit is less then zero");
        if (n == 0) System.out.println("Your digit is zero ");
        if (radix < 2 || radix > RADIX_TEN) throw new IllegalArgumentException();
    }
}

ConditionsLoopsTask3PrimesPrinter.java

package HomeWorkSecond;

/**
 * Created by Andrey on 08.01.2016.
 */
public class ConditionsLoopsTask3PrimesPrinter {
    public static void main(String[] args) {
        int from = 101;
        int to = 110;
        printPrimes(from, to);
    }

    public static void printPrimes(int from, int to) {
        getChecker(from, to);
        String temp = "";
        int count = 1;
        for (int i = getCheck(from); i <= to; i++) {
            if (i % i == 0 && getDivider(count, i, to) == 0) temp = temp  + i+ ", ";
        }
        System.out.print(temp);
    }

    public static double getDivider(int count, int i, int to) {
        int test = 0;
        while (count < to) {
            count++;
            if (count == i) count++;
            if (i % count == 0 ) test++;
        }return test;
    }

    public static int getCheck(int from) {
        if (from < 2) from = 2;
        return from;
    }

    public static void getChecker(int from, int to) {
        if (from > to || to < 0) throw new IllegalArgumentException("");
    }
}

ConditionsLoopsTask4DigitsSumCalculator.java

package HomeWorkSecond;

/**
 * Created by Andrey on 08.01.2016.
 */
public class ConditionsLoopsTask4DigitsSumCalculator {

    public static final int RADIX_TEN = 10;

    public static void main(String[] args) {
        int from = 10;
        int to = 13;
        System.out.print(digitSum(from, to));
    }

    public static int digitSum(int from, int to) {
        check(from, to);
        int temp = 0;
        for (int i = from; i <= to; i++) {
            temp += getSumLength(i);
        }
        temp = getAbs(temp);
        return temp;
    }

    public static int getAbs(int i) {
        int abs = Math.abs(i);
        return abs;
    }

    public static void check(int from, int to) {
        if (from > to) throw new IllegalArgumentException();
        return;
    }

    public static int getSumLength(int i) {
        i = getAbs(i);
        int sumLength = 0;
        while (i > 0) {
            int count = 0;
            int getSumLength = (i % RADIX_TEN);
            count += getSumLength;
            i /= RADIX_TEN;
            sumLength += count;
        }
        return sumLength;
    }
}

ConditionsLoopsTask5RhombusPrinter.java

package HomeWorkSecond;

/**
 * Created by Andrey on 09.01.2016.
 */
public class ConditionsLoopsTask5RhombusPrinter {

    public static final String S_POINT = " . ";
    public static final String S_STAR = " * ";

    public static void main(String[] args) {
        int size = 7;
        printRhombus(size);
    }

    public static void printRhombus(int size) {

        checkSize(size);
        int middle = size / 2 + 1;
        int rightStar = middle;
        int leftStar = middle;
        for (int i = 1; i <= size; i++) {
            if (i < middle) {
                printUpRhombus(leftStar, rightStar, size);
                rightStar++;
                leftStar--;
            }
            if (i >= middle) {
                printBottomRhombus(leftStar, rightStar, size);
                rightStar--;
                leftStar++;
            }
            System.out.println();
        }
    }

    public static void printBottomRhombus(int leftStar, int rightStar, int size) {

        for (int j = size; j >= 1; j--) {
            if (rightStar == j || leftStar == j) {
                System.out.print(S_STAR);
            } else {
                System.out.print(S_POINT);
            }
        }
    }

    public static void printUpRhombus(int leftStar, int rightStar, int size) {

        for (int j = 1; j <= size; j++) {
            if (rightStar == j || leftStar == j) {
                System.out.print(S_STAR);
            } else {
                System.out.print(S_POINT);
            }
        }
    }

    public static void checkSize(int size) {
        int n = size % 2;
        if (size < 0 && n == 0) throw new IllegalArgumentException();
        return;
    }
}