Solutions for Class 02 (Methods Recap)

Here are some possible solutions for the exercises. Please keep in mind all exercises have multiple solutions, and they are all correct if they make the tests pass.

Exercise 1 - Prettify

Prettifying a string means to return the string with the characters that appear side by side separated by a character chosen by the user.

Solution

public static String prettify(String text, char separator) {
    StringBuilder builder = new StringBuilder();
    for(char c : text.toCharArray()) {
        builder.append(c);
        builder.append(separator);
    }
    builder.deleteCharAt(builder.length()-1);
    return builder.toString();
}

Exercise 2 - Count the character

Write a method that takes a String and a char and returns the number of times you can find that character in that string. Note that the counting should be case-insensitive

Solution

public static int countCharacter(String text, char search) {
    int count = 0;
    for(String c : text.split("")) {
        if(c.equalsIgnoreCase(String.valueOf(search))) {
            count++;
        }
    }
    return count;
}

Exercise 3 - Find minimum value

Write a method that takes three numbers and returns the minimum number of the three.

Solution

public static int getMin(int num1, int num2, int num3) {
    return Math.min(num1, Math.min(num2, num3));
}

Exercise 4 - Find maximum value

Write a method that takes three numbers and returns the maximum number of the three

Solution

public static int getMax(int num1, int num2, int num3) {
    return Math.max(num1, Math.max(num2, num3));
}