java example on data types

package snippets1;

/*
 *
 * 
Created by root on 11/3/16. */

public class DataTypeTest
{
  public static void main(String args[]){
  boolean status = true;
  char a = 'A';
  int b = 12;
  byte e = 12;
  float f=3.14f;
  long c = 1235;
  double d = 12345.23;
  String str = "programming";

  System.out.println("boolean: "+status+"\nchar: "+a+"int: "+b+"\nbyte: "+e+"\nfloat: "+f+"\nlong: "+c+"\ndouble: "+d);
        }
} 

Java mysql crud perations

import java.sql.*;

//import java.util.logging.Logger;

//import java.util.logging.Level;

public class Base {

private static final String ConnectionString="jdbc:mysql://localhost/emp";

private static final String DBUser="root";

private static final String DBPass="mysql";

protected static Connection conn=null;

protected static Statement stmt=null;

protected static ResultSet rs=null;

//private static final Logger logger = Logger.getLogger(Base.class.getName());

public static void main(String[] args) {

try{

Base b=new Base();

// logger.entering(Base.class.getName(), "doIt");

b.insert();

b.update();

//b.delete();

b.read();

}catch(Exception e){

e.printStackTrace();

}

}

public Base(){

try{

System.out.println("Connecting to database...");

conn = DriverManager.getConnection(ConnectionString,DBUser,DBPass);

if(conn!=null){

System.out.println("connection established..");

}else{

System.out.println("connections not established..");

}

System.out.println(conn);

}catch(Exception e){

e.printStackTrace();

}

}

public boolean insert(){

try{

stmt=conn.createStatement();

String query=" insert into profile values(\"suresh\",102);";

int res=stmt.executeUpdate(query);

//System.out.println("result of executeUpdate"+res);

if(res==0){

//System.out.println("record not inserted");

return false;

}

else{

//System.out.println("record Inserted");

return true;

}

}catch(Exception e){

e.printStackTrace();

}

return false;

}

public boolean update(){

try{

stmt=conn.createStatement();

String Query="update profile set id=103 where name=\"ramesh\"";

int res=stmt.executeUpdate(Query);

if(res==0){

return false;

}else{

return true;

}

}catch(Exception e){

e.printStackTrace();

}

return false;

}

public boolean delete(){

try{

stmt=conn.createStatement();

String Query="delete from profile where name=\"ramesh\"";

int res=stmt.executeUpdate(Query);

if(res==0){

return false;

}else{

return true;

}

}catch(Exception e){

e.printStackTrace();

}

return true;

}

public boolean read(){

try{

stmt=conn.createStatement();

String Query="select * from profile";

rs=stmt.executeQuery(Query);

while(rs.next()){

String name=rs.getString("name");

int id=rs.getInt("id");

System.out.println("name="+name+" --> "+"id="+id);

}

}catch(Exception e){

e.printStackTrace();

}

return true;

}

}