Example of StringBuffer insert method in java.

public class StringBufferInsertMethod
{
public static void main(String surat[])
{
StringBuffer sb = new StringBuffer("Mahi CandyFry");
System.out.println(sb);

String str1 = "Hello ";
sb.insert(0, str1);
System.out.println(sb);

String str2 = " of ";
sb.insert(11, str2);
System.out.println(sb);
}
}

Output:

Example of StringBuffer delete method in java.

public class StringBufferDeleteCharacters
{
public static void main(String surat[])
{
StringBuffer sb = new StringBuffer("Mahi");
System.out.println("Original text: " + sb);

sb.delete(0, 2);
System.out.println("Current text: " + sb);

sb.deleteCharAt(sb.length()-1);
System.out.println("Current text: " + sb);
}
}

Output:

Example of StringBuffer reverse method in java.

public class StringBufferReverseMethod
{
public static void main(String surat[])
{
StringBuffer sb = new StringBuffer("Mahi CandyFry");
System.out.println("Original text: " + sb);

sb.reverse();
System.out.println("Reversed text: " + sb);
}
}

Output:

Example of StringBuffer replace method in java.

public class StringBufferReplaceMethod
{
public static void main(String surat[])
{
StringBuffer sb = new StringBuffer();
sb.append("CandyFry Developers");

System.out.println("Original Text : " + sb);

sb.replace(0, 8, "Hello");

System.out.println("Replaced Text : " + sb);
}
}

Output:

Example of StringBuffer append method.

public class StringBufferAppendMethod
{
    public static void main(String surat[])
{
        StringBuffer sb = new StringBuffer();

        sb.append(" Append String: ");
  String str = "JCG";
sb.append(str);

        sb.append("\n Append boolean: ");
boolean b = true;
sb.append(b);

        sb.append("\n Append char: ");
char c = 'a';
sb.append(c);

        sb.append("\n Append char array: ");
char[] ca = new char[] {'J','C','G'};
sb.append(ca);

        sb.append("\n Append double: ");
double d = 1.0;
sb.append(d);

        sb.append("\n Append float: ");
float f = 1.0f;
sb.append(f);

        sb.append("\n Append int: ");
int i = 1;
sb.append(i);
     
sb.append("\n Append Object: ");
  Object obj = new String("JCG");
        sb.append(obj);

        System.out.println(sb.toString());
    }
}

Output:

Java URL class.

import java.io.*;
import java.net.*;
 
public class URLDemo
{
public static void main(String surat[])
{
try
{
URL url=new URL("http://www.facebook.com");
 
System.out.println("Protocol: "+url.getProtocol());
System.out.println("Host Name: "+url.getHost());
System.out.println("Port Number: "+url.getPort());
System.out.println("File Name: "+url.getFile());
}
catch(Exception e)
{
System.out.println(e);
}
}
}

Output:

Serialization : ObjectInputStream :- Converting stream into object.

import java.io.Serializable;
import java.io.*;

class student implements Serializable
{
int id;
String name;

public student(int id,String name)
{
this.id=id;
this.name=name;
}
}

public class Serialisation1
{
public static void main(String surat[]) throws IOException
{
student s1=new student(1,"MaHi");

FileOutputStream fout=new FileOutputStream("m3.txt");

ObjectOutputStream out=new ObjectOutputStream(fout);

out.writeObject(s1);
out.flush();
System.out.println("Success");
}
}

Output: