What is String in Java?
- It is an object of type String.
- String is a sequence of characters.
- String is immutable.
Following are the
different constructors provided by Java to create String.
- Create an empty String.
String str = new String ();
- Create a String by passing String object as constructor argument.
String
str = new String (String strObj);
- Create a String initialized by an array of character.
String
str = new String (char ch[]);
- Creating String by String Literal way.
String
str = “JAVA”;
Example Program:
package
com.string.handling;
// Package
is container of similar classes and interfaces etc.
public class MyFirstString
{
public static void main(String[]
args)
{
String str1=new String(); // empty
string object is created.
// another
way of string creation.
char ch[] = {'J','A','V','A'};
String str2=new String(ch); //String
initialized by character array.
//initializing
with String object.
String str3=new String(str2);
//assigning
one string to other.
str1=str3;
// creating
string literal.
String str4="JAVA";
System.out.println("Empty
String output: "+str1);
System.out.println("String
initialized by charater: "+str2);
System.out.println("String
initialized by String object: "+str3);
System.out.println("String
Literal: "+str4);
}
}
|
Note:
String is immutable. Once string is created you cannot change it.
There are
two ways by which String can be created:
- By New Keyword.
- By String Literal.
// Stay
tuned to explore difference between new keyword usage and String Literal.
