My String Methods

// My String Method Problem,
// Renee Waggoner
// June 24, 2019
// Special Requirements: None

package string_methods;
import java.util.Scanner;

public class MyStringMethods {
    private String myStr = "";

    public void readString() {

        // Prompt the user and read in a String and then store
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter in the desired String: ");
        myStr = keyboard.nextLine();

        keyboard.close();
    }

    public void setString(String s) {
        myStr = s;
    }
    // use indexOf and return the number of occurrences of the string "s"
    public int countOccurrences(String s) {

        int count = 0;
        int pos = myStr.indexOf(s, 0);

        while (pos != -1 && pos<myStr.length()) {
            pos = myStr.indexOf(s, pos+1);
            count++;
        }
        return count;
    }

    // use indexOf and return the number of occurrences of the character "c" in "myStr"
    public int countOccurrences(char c) {

        int count = 0;
        int pos = myStr.indexOf(c, 0);

        while (pos != -1) {
            pos = myStr.indexOf(c, pos+1);
            count++;
        }
        return count;
    }

    public int countLowerCaseLetters() {
        int lowerCaseLetters = 0;
        for (int i = 0; i < myStr.length(); i++)

            if (Character.isLowerCase(myStr.charAt(i))) {
                lowerCaseLetters++;
            }
        return lowerCaseLetters;
    }
    int countUpperCaseLetters() {
        int upperCaseLetters = 0;
        for (int i = 0; i < myStr.length(); i++)
            if (Character.isUpperCase(myStr.charAt(i))) {
                upperCaseLetters++;
            }
        return upperCaseLetters;
    }

    public void printCounts(String s, char c) {

        System.out.println("***************************************");
        System.out.println("Analyzing: myStr=" + myStr);
        System.out.println("Number of Upper case letters=" + countUpperCaseLetters());
        System.out.println("Number of Lower case letters=" + countLowerCaseLetters());
        System.out.println("Number of " + s + " is " + countOccurrences(s));
        System.out.println("Number of " + c + " is " + countOccurrences(c));
    }

    public static void main(String[] args) {

        MyStringMethods msm = new MyStringMethods();
        msm.readString();
        msm.printCounts("big", 'a');
        msm.setString("Parked in a van down by the river bank .... The vanevan vanished near a lot of other vans");
        msm.printCounts("van", 'a');
        MyStringMethods msm2 = new MyStringMethods();
        msm2.setString("the elephant in the room wouldn't budge");
        msm2.printCounts("the", 'i');
    }
}