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java lang Long Class

java lang Long Class

java.lang.Long Class

Long Class in Java

The Long class wraps the value of primitive data type long into Long object. An object of type Long contains a single field whose type is long. In other words the wrapper classes create objects for primitive data types. The wrapper classes are Boolean, Byte, Character, Short, Integer, Float, Long and Double.

Java Long class provides several useful methods for converting a long to a String and a String to a long, as well as other constants and methods.

java.lang.Long Class Example

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/*  Java Long Class Example
    Save with file name LongExample.java    */
  
public class LongExample
{
  public static void main(String args[])
  {
    //JAVA LONG DECLARATION
    Long b;
    //MEMORY ALLOCATION FOR LONG
    b = new Long(101);
    //JAVA LONG CLASS OUTPUT
    System.out.println("Java Long Class Example");
    //RETURNS byte PRIMITIVE DATA TYPE
    System.out.println("byte Value is : "+ b.byteValue());
    //RETURNS short PRIMITIVE DATA TYPE
    System.out.println("short Value is : "+ b.shortValue());
    //RETURNS double PRIMITIVE DATA TYPE
    System.out.println("double Value is : "+ b.doubleValue());
    //RETURNS float PRIMITIVE DATA TYPE
    System.out.println("float Value is : "+ b.floatValue());
    //RETURNS int PRIMITIVE DATA TYPE
    System.out.println("int Value is : "+ b.intValue());
    //RETURNS long PRIMITIVE DATA TYPE
    System.out.println("long Value is : "+ b.longValue());
  }
}

java.lang.Long Class Example 2

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/*  Java Long Class Example 2
    Save with file name LongExample2.java   */
  
public class LongExample2
{
  public static void main(String args[])
  {
    //JAVA LONG DECLARATION
    Long b, b2;
    //MEMORY ALLOCATION FOR JAVA LONG
    b = new Long(101);
    b2 = new Long("102");
    //JAVA LONG CLASS OUTPUT
    System.out.println("Java Long Class Example");
    System.out.println("b Value is : "+ b.longValue());
    System.out.println("b2 Value is : "+ b2.longValue());
    System.out.println("b compareTo b2 : "+ b.compareTo(b2));
    System.out.println("b equals b2 : "+ b.equals(b2));
  }
}

Following Java Long class example you can learn how to use static methods of Java Long Class. If you use static methods you need not to create the class instance. You can call static methods using the class name as reference.

java.lang.Long Class Example 3

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/*  Java Long Class Example 3
    Save with file name LongExample3.java   */
  
public class LongExample3
{
  public static void main(String args[])
  {
    //JAVA LONG CLASS STATIC METHODS USAGE
    System.out.println("Java Long Class Example");
    //RETURN Java Long OBJECT WITH THE SPECIFIED PRIMITIVE long DATA TYPE
    System.out.println("valueOf : "+ Long.valueOf(101));
    //RETURN Java Long OBJECT WITH THE SPECIFIED
    //PRIMITIVE long DATA TYPE AS String
    System.out.println("valueOf : "+ Long.valueOf("103"));
    //RETURN PRIMITIVE long DATA TYPE WITH THE SPECIFIED
    //PRIMITIVE long DATA TYPE AS String
    System.out.println("parseLong : "+ Long.parseLong("105"));
  }
}
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