import java.util.*;

class Person {
	
	String firstName;
	String secondName;
	String phoneNumber;
}

	

class Population {

}



class Directory {
	
	public static void main(String[] args) {		

		String [] firstNames = new String[1000];
		String [] secondNames = new String[1000];
		String [] phoneNumbers = new String[1000];

		int i = 0;

		while(!(Console.endOfFile())) {

			Person newContact = new Person();

			newContact.firstName = Console.readString();
			firstNames = newContact.firstName;

			newContact.secondName = Console.readString();
			secondNames = newContact.secondName;

			newContact.phoneNumber = Console.readString();
			phoneNumbers = newContact.phoneNumber;

			i++;
		}

		for(int j = 0; j < firstNames.length; j++) {

			if(firstNames[j].compareTo(firstNames[j + 1]) > 0) {
		
				String temp = firstNames[j];
				firstNames[j] = firstNames[j + 1];
				firstNames[j + 1] = temp;

				String temp2 = secondNames[j];
				secondNames[j] = secondNames[j + 1];
				secondNames[j + 1] = temp2;

				String temp3 = phoneNumbers[j];
				phoneNumbers[j] = phoneNumbers[j + 1];
				phoneNumbers[j + 1] = temp3;
	
			}
		}
		
		for(int k = 0; k < firstNames.length; k++) {

			System.out.println(secondNames[k] + ", " + firstNames[k] + phoneNumbers[k] + ".");
		}

	}
}

Quote:Original post by Hauk
if(firstNames[j].compareTo(firstNames[j + 1]) > 0) {