0
/*
* Notes here
*/
package billboardsign;
/**
*
* @author John Parada
*/
import java.util.ArrayList;
public class Billboard
{
private String text;
private ArrayList<String> messages = new ArrayList<String>();
public Billboard()
{
messages.add("Happy New Year");
messages.add("Happy Holidays");
messages.add("Team Pizza");
messages.add("Game On");
messages.add("Let's Go Team");
}
public ArrayList<String> getMessages()
{
return messages;
}
public void setMessages(String msg)
{
messages.add(msg);
}
public boolean isEmpty()
{
return text == null || text.isEmpty();
}
public String substring(int begin, int end)
{
if (begin >= 0 && end < text.length())
{
return text.substring(begin, end);
}
else
return null;
}
//add the method Reverse here
// THIS CODE IS NO GOOD!for (int count = text.length() - 1; count >= 0; count--)
//FOLLOW UP LINE System.out.printf("%s ", text.charAt(count));
public String reverse()
{
if (isEmpty())
return null;
else
{
char[] chars = text.toCharArray();
//create antoher arrayList
char[] reverse = new char[chars.length];
for (int i = chars.length - 1, j = 0; i < 0; i--, j++)
{
reverse[j] = chars[i];
}
return new String(reverse);
}
}
//add the method Replace string here
public String replace(char oldChar, char newChar)
{
return text.replace(oldChar, newChar);
}
//add the method displayInfo here
public void displayInfo()
{
System.out.printf("\n%s\nMessage", messages);
}
}
/*
* Notes on the Billboard Project
*/
package billboardsign;
/**
*
* @author John Parada
*/
import java.util.Scanner;
public class BillboardSign
{
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
Billboard newBillboard = new Billboard(); //default constructor
//Menu
int choose_again = 1;
int choiceNumber;
Scanner newInput = new Scanner(System.in);
while (choose_again > 0)
{
//list options to user
System.out.println ("\nPlease choose a number between 1 and 6 to choose an\n"
+ "option for the Messages Board to display: "
+ "\n1) Display Default Message 1"
+ "\n2) Display Default Message 2"
+ "\n3) Display Default Message 3"
+ "\n4) Display Default Message 4"
+ "\n5) Display Default Message 5"
+ "\n6) Enter a New Message"
+ "\n7) Reverse a Message"
+ "\n8) Replace a Message - Substring"
+ "\n9) Exit Program");
//get the user to input a selection
System.out.print ("\nPlease Enter Your Selection: ");
choiceNumber = newInput.nextInt();
//use switch statement to help with thieir choice input
switch (choiceNumber)
{
case 1:
//execute get() and displayInfo() method for default Message 1
//newBillboard = Billboard();
messages.get(0);
displayInfo();
break;
case 2:
//execute get() and displayInfo() method for default Message 2
newBillboard = Billboard();
Billboard = displayInfo();
break;
case 3:
//execute get() and displayInfo() method for default Message 3
newBillboard = Billboard();
Billboard = displayInfo();
break;
case 4:
//execute get() and displayInfo() method for default Message 4
newBillboard = Billboard();
Billboard = displayInfo();
break;
case 5:
displayInfo();
break;
case 6:
//execute set() and displayInfo() methods to create a new message
break;
case 7:
//execute reverse message method
break;
case 8:
//execute Replace message - Substring method
case 9:
//Dispaly to the user that they have chose to exit
System.out.print ("\nYou have chosen to cancel and exit. \n");
System.exit(0);
}
//prompt user for antother selection? (Contiune=1 and Exit= -1)
System.out.println();
System.out.print ("\nIf you would like to select another animal enter 1 or if your are done enter -1: ");
choose_again = newInput.nextInt();
}
}
private static void displayInfo() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
总之，当用户选择1时，他或她应该获取ArrayList（0）的第一个元素。当他或她选择2时，他们将获得ArrayList（1）中的第二个元素。我需要调用get方法，并使用Billboard的displayInfo。从另一个类的ArrayList中获取和设置方法
非常感谢您提供任何帮助。
问候，
约翰·帕拉达