Ejercicio 7 de Java

exercise.java

package com.company;

import java.util.Scanner;

public class Main {



    public static void main(String[] args) {
	  // write your code here
        System.out.println("1er ejercicio");
        ejercicio7322();
        System.out.println("2er ejercicio");
        ejercicio7323();
        System.out.println("3er ejercicio");
        ejercicio7324();
    }

    static String getNameFromUser() {
        Scanner teclado = new Scanner(System.in);
        return teclado.nextLine();
    }

    static void ejercicio7322() {
        String name = getNameFromUser();
        String newName;
        if (name.charAt(0) != 'A') {
            StringBuilder builder = new StringBuilder(name.substring(1));
            builder.insert(0,"A");
            newName = builder.toString();
        } else {
            StringBuilder builder = new StringBuilder(name.substring(1));
            builder.insert(0, "B");
            newName = builder.toString();
        }
        System.out.println(newName);
    }

    static void ejercicio7323() {
        String name = getNameFromUser();
        String space = " ";
        StringBuilder builder = new StringBuilder("Don ");
        builder.insert(builder.length(), name);
        System.out.println(builder.toString());
    }

    static void ejercicio7324() {
        String name = getNameFromUser();
        StringBuilder newName = new StringBuilder(name.length());
        for (int i = 0; i < name.length(); i++) {
            char letra = name.charAt(i);
            if (i % 2 == 0) {
                newName.append(Character.toLowerCase(letra));
            } else {
                newName.append(Character.toUpperCase(letra));
            }
        }
        System.out.println(newName.toString());
    }
}