STRING

    In Java, strings are class objects and implemented using two classes, String and StringBuffer.

    A Java string is not a character array and is not NULL terminated.

      String may be declared and created as follows:

String stringname;

stringname=new String(“String”);

Ex:   String fname;

         fname=new String(“Santosh”);

         String fname=new String(“Santosh”);

        Java strings can be concatenated using the ‘+’ operator.

Ex:String name=name1+name2;

         String city=”New” +”York”                     

    String Arrays: String array can be created as follows:

Ex: String item[]= new String[3];

    String Methods: Some of the most commonly used methods on the string class are shown below:

Method Call	Task Performed
s2=s1.toLowerCase;	Converts the string s1 to all lowercase.
s2=s1.toUpperCase;	Converts the string s1 to all uppercase.
s2=s1.replace(‘x’,’y’);	Replace all appearances of x with y.
s2=s1.trim();	Remove white spaces at the beginning and end of the string s1.
s1.equals(s2);	Returns ‘true’ if s1 is equal to s2.
s1.equalsIgnoreCase(s2);	Returns ‘true’ if s1=s2, ignoring the case of characters.
s1.length();	Give the length of s1.
s1.CharAt(n);	Give nth character of s1.
s1.compareTo(s2);	Return negative if s1<s2, positive if s1>s2, and zero if s1=s2.
s1.concat(s2);	Concatenates s1 and s2.
s1.substring(n);	Give substring starting from nth character.
s1.substring(n,m);	Give substring starting from nth character up to mth.(not including mth)
String. Valueof (p);	Creates a string representation of the object p.
p.toString()	Creates a string representation of the object p.
s1.indexof(‘x’);	Give the position of the first occurrence of ‘x’ in the string s1.
s1.indexof(‘x’,n);	Give the position of ‘x’that occurs after nth position in the string s1.
String.valueof(Variable)	Converts the parameter value to string.