More String Methods

• All of these functions are for Strings.  So, to use them, you need to have a String object, let's call it myString, then a period, then a function name.
• Example: myString.length(); will return the length of the String held in the myString object.
• length() returns the length, in characters, of the String.
• Strings are immutable, or can't be changed.  If you need to change the value of a String object, you must make a new String, possibly via the substring() method, and assign it to back the String object.  In other words, there is no method to change an individual character of a String object.  Changing a String results in a whole new String.
• The advantage?  If object a = "Hello" and object b = "Hello", they both actually point to the same area in memory.
• If you are constantly changing a String, you can save time with the StringBuffer object.  This is optimized for String manipulation, and can easily return a string via the toString() method.
• toUpperCase() makes a String all upper case.
• toLowerCase() makes a String all lower case.
• replace(char newChar, char oldChar) returns a new String where all of the oldChars are replaced with newChar.
 
 Comparing Strings
 
 
 

Created by:  Brandan Jones January 4, 2002