Java Training Updates

In this video, learn about Java and its advantages. Also, check out the difference between Java and C++, Java development kit, Java Run Time Environment (JRE) with a proper demonstration program for better clarity.

It simply means doing back end and front end programming using java as the main language and other technologies, tools and frameworks. For example:

1. Core Java+advanced Java+Spring+Hibernate+ SpringBoot, Oracle+Html+Css+Javascript+Angular+Bootstarp+Ajax).
2. Core Java+advanced Java+Spring+Hibernate+ SpringBoot, MySql/MongoDB+Html+Css+Javascript+Angular/ React ec. You can have any combination.

A lambda expression, introduced in Java 8 is similar to a block of code resembling an anonymous function that can be passed to constructors or methods for execution as an argument.

Examples:

a)() -> System.out.println("Hello Lambda")
b)(int x) -> 3
   x -> { 
          System.out.println(x + 2);
          return x +3;
        }

In the first example :

() identifies the lambda's parameter list (there are no parameters),

 -> indicates that the expression is a lambda

System.out.println("....") is the code to be executed which prints the string "Hello Lambda".

In the Second Example:

(x) identifies the lambda's parameter list (x is an input parameter),

 -> indicates that the expression is a lambda

System.out.println("....") is the code to be executed which calculates the value of x + 2 and prints it. Also assigns a value of x+3 = 6 to variable x which had an initial value of 3.

There are some reasons. First, it is open-source. It helps in the fast development of web apps with minimal coding. We can break down the complex work of creating UI components into smaller pieces. Developers can write their apps within JavaScript.

Big companies like Facebook, PayPal, Uber, Instagram, and Airbnb use it to solve user interface related issues.

Dear Sandeep,

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I wish you luck.

this.is my php file:

$con = mysqli_connect($HostName,$HostUser,$password,$db);

 // Getting the received JSON into $json variable.
 $json = file_get_contents('php://input');

 // decoding the received JSON and store into $obj variable.
 $obj = json_decode($json,true);

 // Populate ID from JSON $obj array and store into $ID.
$ID = $obj['numero'];

//Fetching the selected record.
$CheckSQL = "SELECT origine FROM envoi WHERE numero='$ID'";

$result = $con->query($CheckSQL);

if ($result->num_rows >0) {
 while($row[] = $result->fetch_assoc()) {
 $Item = $row;
 $json = json_encode($Item);
 echo $json;
 }
}
else {  
 $EmailExistMSG= "No Results Found.";
 $EmailExistJson = json_encode($EmailExistMSG);
 echo $EmailExistJson ; 

}

And this is my react native script where i should enter number and fetch his data if it's exist in my database:

search= () =>{
     //alert('ok');
     const {numero}=this.state;

     fetch('http://192.168.1.4:80/search.php',{
     method:'post',
     header:{
     'Accept':'application/json',
     'Content-type' :'application/json'
     },
     body:JSON.stringify({numero:numero})}).then((responseData)=>responseData.json()).then((responseJson)=>{alert(responseJson)}).catch((error)=>{console.error(error);})}

  render(){
    return(

          <View style={styles.pass}>
          <TextInput placeholder="Saisir le numéro de suivi de l'envoi"   onChangeText= {numero=>this.setState({numero})}/>
          <TouchableOpacity onPress={this.search} style={{marginTop:20,marginLeft:70}}>
          <Icon name="search"  size={20}/>
          </TouchableOpacity>
          </View>

    )
  }