Computer Applications

What important is automatically happening in following code ?

long a = 124235L; 
Long b = new Long(a);
long c = b.longValue(); 
System.out.println(c);

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Long b = new Long(a);

This statement boxes long type a into a Long object b, boxing a primitive type into a Wrapper class object.

long c = b.longValue();

This statement unboxes Long object b and stores it in long variable c, converting a Wrapper class object into a primitive data type.

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double n2 = Double.parseDouble("2"); 
double n3 = Double.parseDouble("OCA"); 
System.out.println(n2 + " " + n3);

double n1 = Double.parseDouble("8.0"); 
double n2 = Double.parseDouble("2"); 
System.out.println(n1 + " " + n2);

Integer c = 155; 
Integer d = 155;
System.out.println(c == d); 
System.out.println(c.equals(d));

Integer i = new Integer(10);
if (i < 100)
    System.out.println(i); 
else
    System.out.println(i + 10);