Strings

• Enclosed in double quotes
  
• + is the only overloaded operator. It is only overloaded for strings.
• += is not overloaded.

• String objects must be initialized when created.
• When the compiler encounters a series of characters enclosed in double quotes, it creates a String object.
• Neither String nor StringBuffer are a descendant of one another.

String

• String objects are read-only.

String str1 = "alpha"; 
String str2 = new String("alpha");

Functions

• boolean equals(String str)
• boolean equalsIgnoreCase(String str)
• int compareTo(String str)

• int length()

• char charAt(int index)
• String substring(int beginIndex [, int endIndex])
• int indexOf(String str [, int fromIndex])

StringBuffer

• StringBuffer objects can be edited.

StringBuffer str1 = "beta";
StringBuffer str2 = new StringBuffer("beta");
StringBuffer str3 = new StringBuffer(50);

Functions

• int length()

• synchronized charAt(int index)
• synchronized void setCharAt(int index, char ch)

• synchronized StringBuffer append(TYPE arg)
• synchronized StringBuffer insert(int offset, TYPE arg)