JAVA

</>   Java Tutorial

150 Programmes

Practicals

Java Theory

String

String is a sequence of characters, which are widely used in java programming. In java strings are treated as objects.

String Declaration
String_type String_variable = 'Sequence of string';
Ex: String str = "Skillpudit";
Index012345
VariableHell0\0
Address0x234510x234520x234530x234540x234550x23456

String Declaration

There are two ways to create string.

  • String Literal
    String str="Skill pundit"
  • Using New Keyword
    String str=new String ("Skill Pundit")

Size and Range of Data Types

String a = new String("now is");

String b = new String("the time");

String c = new String("the");

Instance method callReturn TypeReturn Value
a.lenght()int6
a.charAt(4)char'i'
a.substring(2,5)string'w i'
b.stringwith('the')booleantrue
a.indexOf('is')int4
a.contact(c)string'now is the'
b.replace('r'.'T')String'The Tim'
a.split('')String[]{'now', 'is'}
b.equls()booleanfalse

String length()

The Java String length() method is used to find the length of the string. It returns count of total number of characters present in the String.

Example
public class findlength
{
public static void main (String args[]);
{
String s1= "Skillpundit";
System.out.println(”String length is:” +s1.length()); //Output: 11 }
 }

String compareTo()

The Java String compareTo() method is used to compares the given string with current string.

Example
public class CompareToExample
{
public static void main (String args[]);
{
String s1= "Skill";
String s2= "Pundit";
String s3= "Skill";
System.out.println(s1.compareTo(s3)); //0 because both are equal
System.out.println(s1.compareTo(s2)); //greater than 0 }
 }

String concat()

The Java String concat() method combines a specific string at the end of another string and ultimately returns a combined string. It is like appending another string.

Example
public class CompareToExample
{
public static void main (String args[]);
{
String s1= "Skill";
String s2= "Pundit";
s1 = s1 .concat(s2);
System.out.println(s1); //Skillpundit
 }
 }