Java's character and assorted string classes support text-processing - 12

• public int indexOf(int ch) returns the index of ch's first occurrence in the current String's value array. If that character does not exist, -1 returns. Example: System.out.println ("First index = " + "The quick brown fox.".indexOf ('o')); (output: First index = 12).
• public String intern() interns a String in the common string memory pool. Example: String potentialNapoleanQuote = new String ("Able was I, ere I saw Elba!"); potentialNapoleanQuote.intern ();.
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Tip

To quicken string searches, use intern() to intern your Strings in the common string memory pool. Because that pool contains no duplicate Strings, each object has a unique reference. Plus, using == to compare references proves faster than using a method to compare a string's characters.

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• public int lastIndexOf(int ch) returns the index of ch's last occurrence in the current String's value. If that character does not exist, -1 returns. Example: System.out.println ("Last index = " + "The quick brown fox.".lastIndexOf ('o')); (output: Last index = 17).
• public int length() returns the value stored in count. In other words, this method returns a string's length. If the string is empty, length() returns 0. Example: System.out.println ("abc".length ()); (output: 3).