• Use the equals method to find out whether two strings are the same. For example:

       String first = new String("Text");
       String second = new String("Text");
       if (first.equals(second))
          System.out.println("The strings are equal");
  

  will print the message that the two strings are equal. What happens in the following:

       String first = new String("Text");
       String second = new String("Text");
       if (first == second)
          System.out.println("The strings are equal");
  

• Lexicographic order (generalization of alphabetical order). Java represents characters by Unicode (see page 707 of the text). In this ordering, numbers come before letters and capital letters come before lower case letters. Lexicographic comparison is like alphabetizing the strings.
  • "Apple" < "apple"
  • "Apple" < "Apples"
  • "Apple1" < "Apples"

• compareTo compares strings lexicographically:

         if (myString.compareTo("Apples") < 0)
            System.out.println("myString is alphabetized before Apples"):
  

• charAt returns the character at a specified position with 0 being the beginning.
  • "Hello".charAt(1) returns 'e'.

• substring returns a part of the string.
  • "Terrible".substring(5) returns "ble" (the part of "Terrible" starting in position 5 and going to the end of the string).
  • "Terrible".substring(3,7) returns "ribl" (the part of "Terrible" that starts at position 3 up to but not including position 7).

• indexOf returns the first occurrence of a character or string within this String.
  • "Terrible".indexOf('r') is 2.
  • "Terrible".indexOf("ibl") is 4.
  • "Terrible".lastIndexOf("r") is 3.
  • "Terrible".indexOf('A') is -1.

• length returns the length of this string.
  • "Terrible".length() is 8.
  • "A".length() is 1.

• + concatenates two strings (it is not a method).
  • "Terrible" + "Monster" produces the string "TerribleMonster"

• concat method concatenates a string to this string.

        String first = new String("text");
        first.concat("book"); 
        System.out.println(first);
  

     String vowels = new String("aeiouAEIOU"); 
     if (vowels.indexOf(thisChar) != -1)
        System.out.println("This character is a vowel");

public class TextLine {
   private String theLine;

   //constructor
   public TextLine (String line) {
      theLine = new String(line);
   } 

   //accessor methods


   //modifier methods 
   public void Insert(String phrase, int position) {

   }

   public void Delete(String phrase) {

   }
     
   public void Replace(String oldphrase, String newphrase) {

   }

}