Java Class 30 String (12/4/2023)

String: A sequence of a character is called a String. We are creating an object of String two types-
 By literal
 By new keyword

1. By literal: if we create an object using literal memory will be create in pool area. In pool area we can’t create a duplicate object.
String s=”Hello”;
2. By new keyword: if we create an object by using new keyword then memory will be create in heap area. In heap area we can create memory as duplicate.
String s=new String(“Hello”);


String s=”Hello” //pool
String s1=”Hello” //pool
String s2=new String(“Hello”); //heap
String s3=new String(“Hello”); //heap


package javaprograms;

public class String_demo
{
public static void main(String[] args)
{
String s="Hello"; //pool
String s1="Hello"; //pool
String s2=new String("Hello"); //heap
String s3=new String("Hello"); //heap


System.out.println(s==s1); //true
System.out.println(s==s2); //false
System.out.println(s2==s3); //false


}
}

Example-2

package javaprograms;

public class StringMethods
{


public static void main(String[] args)
{
String s=" Hello java ";
String s1="hellojava";
// System.out.println(s.charAt(0));
//System.out.println(s.concat("ajay"));
//System.out.println(s.contains(s1));
//System.out.println(s.equalsIgnoreCase(s1));
//System.out.println(s.replace("Hello", "ajay"));
//System.out.println(s.substring(0,5));
System.out.println(s.trim());
}
}