Introduction to Java Programming

        

          

            

              
              

          
 
          

          
          

          

              

                  
              

          

          

          

          
Session on Primitive Data Types In Java

          

          

              

                  
              

          

          

          
Session on use of printf() method in Java

          

          

              

                  
              

          

          

          
          

          

              

                  
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Link for Downloading JDK is given below

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Download Eclipse

                  
Link for Downloading Eclipse is given below

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Note: For any later versions of Eclipse JDK 11 or a newer version is needed

                 

               

            

            




Data Types in Java





  Java Data Types
  
    

      Data Type
      Syntax
      Size (bits)
      Range
      Default Value
    

  
  
    

      byte
      byte myByte;
      8
      -128 to 127
      0
    

    

      short
      short myShort;
      16
      -32,768 to 32,767
      0
    

    

      int
      int myInt;
      32
      -2,147,483,648 to 2,147,483,647
      0
    

    

      long
      long myLong;
      64
      -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
      0L
    

    

      float
      float myFloat;
      32
      Approximately ±3.40282347E+38
      0.0f
    

    

      double
      double myDouble;
      64
      Approximately ±1.7976931348623157E+308
      0.0d
    

    

      char
      char myChar;
      16
      Unicode characters
      '\u0000'
    

    

      boolean
      boolean myBoolean;
      1 bit
      true or false
      false
    

  





 
            

Declaring a variable with int data type in Java



public class javalabclass{
public static void main(String args[]) 
{
  //Declaring an int Variable
  int a =2147483647;
  System.out.println(a);

}
}







Declaring a variable with long data type in Java



public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring a Long Variable
      long a =2147483648L;
      System.out.println(a);
  }
} 






Declaring a variable with short data type in Java



package javaprogrammingdemo;
public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring an short Variable
      short a =32767;
      System.out.println(a);
  }
}  






Declaring a variable with float data type in Java



package javaprogrammingdemo;
public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring an float Variable
      float k = 2.3f;
      System.out.println(k);
  }
}  






Declaring a variable with double data type in Java



package javaprogrammingdemo;
public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring an double Variable
      double h = 2.34;
      System.out.println(h);
  }
}  






Declaring a variable with char data type in Java



package javaprogrammingdemo;
public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring an char Variable
      char h = 'A';
      System.out.println(h);
  }
} 






Declaring a variable with boolean data type in Java



public class javalabclass{
  public static void main(String args[]) 
  {
      //Declaring an char Variable
      boolean a = true;
      System.out.println(a);
  }
}  






Exercise  -  Write a program to store and print the variables of the following data Types
int
 
long

short
 
byte
 
float
 
double
 
boolean
 



package javaprogrammingdemo;
public class javalabclass{
  public static void main(String args[]) 
  {
  
    int a=2;
    float b=23.f;
    long k = 23567L;
    short m = 3;
    double j = 234.556;
    boolean choice = true;
    byte h = 12;
    
    System.out.println(a);
    System.out.println(b);
    System.out.println(k);
    System.out.println(m);
    System.out.println(j);
    System.out.println(choice);
    System.out.println(h);
  }
}

Output 
2
23.0
23567
3
234.556
true
12






Print Hello World Message to the user



public class javalabclass{
  public static void main(String args[]) 
  {
       System.out.println("hello World"); 
  }
}  






Print an integer value with a message to the user 



public class javalabclass{
  public static void main(String args[]) 
  {
      int a=4;
       System.out.println("The marks you have scored is "+a); 
  }
}  






Print the message Satish you have scored 4 Marks using printf function



public class javalabclass{
  public static void main(String args[]) 
  {
      int a=4;
      String s = "Satish";
       System.out.printf("%s You have scored %d marks ",s,a); 
  }
}  






Print a character within a String using printf function



public class javalabclass{
  public static void main(String args[]) 
  {
       char t = 'A';
       System.out.printf("The first character is %c",t); 
  }
}
output - The first character is A  






Code for breaking a sentence using newline character



public class javalabclass{
  public static void main(String args[]) 
  {
       System.out.printf("Satish %nshould never %nbe a professor"); 
  }
}
output
Satish 
should never 
be a professor  






Formatting float output to have a certain number of decimal places



//printing only 2 decimal places in the output
public class javalabclass{
  public static void main(String args[]) 
  {
      float k = 3.4578f;
      System.out.printf("%.2f",k);
  }
}