No. A constructor is used once per object. Once an object has been created the constructor is finished.
After an object has been constructed it can (usually) be changed by
using its own methods (not its constructor).
However, some objects are designed so that their data
cannot be changed after the object has been constructed.
String is one of these.
String objects are immutable.
This means that after construction,
they cannot be altered.
The variables and methods of an object are
called the members of that object.
The members of an object are accessed using dot notation.
The example program creates a
referred to by the variable
String str1; // str1 is a reference to an object. int len; str1 = new String("Random Jottings"); // create an object of type String len = str1.length(); // invoke the object's method length()
length() method is a member of the object.
To run a method of the object referenced by
str1 do this:
len = str1.length();
This assignment statement, as always, does its work in two steps:
The right side of this particular assignment statement executes the
length() which is member of the object referenced by
Executing this method
returns the number of characters in the object.
Do you think that the following is correct?
str1.length() = 12 ; // change the length of str1