JAVA String

String class is defined in java.lang.String.
It represents character strings (or array of character).

Like any other java class String can be initiated using following syntax:
Class_name identifier = new Class_name(para);

For example, String name = new String("JAVA");

However, as String is commonly used class, it can be initiated as a data type (like int, char),
For example, String name = "JAVA";

JAVA Data Types

There are 8 primitive Data Types in java.
# Data_Type Size Range
1. byte 8-bit 0 to 127

2. short 16-bit -32,768 to +32,767

3. int 32-bit -2,147,483,648 to +2,147,483,647

4. long 64-bit -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807

5. float 32-bit beyond the scope (click here for more information)

6. double 64-bit beyond the scope (click here for more information)

7. boolean Either true true and false
or false

8. char 16-bit '\u0000' (or 0) to '\uffff' (or 65,535).


For more information click here.

JAVA Lesson 2

Variable declaration:
Syntax : variable_data_type identifier;
Example : int number;
String name;


Variable initialization:
Syntax : identifier = value;
Example : number = 5;
name = "your_name";


Declaring and initializing at the same line
Syntax : variable_data_type identifier = value;
Example : int number = 5;
String name = "your_name";

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JAVA Lesson 1

//Hello World

public class MyFirstJavaProgram{
public static void main(String args[]){
String msg = "Hello World!";
System.out.println(msg);
}
}


//this code will print "Hello World!"