Page 360 - Computer_Science_F5

Program Example 5.21:

Java program to create a class with default constructor

// This code shows a parameterized constructor Chapter Five: Object oriented programming with Java
class MyClass {
FOR ONLINE READING ONLY
int x;
MyClass(int I) { // The constructor here has a parameter
x = I;
}
}
class ConstraDemo {
public static void main(String args[]) {
MyClass t1 = new MyClass(10);
MyClass t2 = new MyClass(88);
System.out.println(t1.x + “ “ + t2.x);
}
}

Output:

Figure 5.20: Output of Java class print

In this version of the program, the MyClass (e) Constructor overloading
( ) constructor defines one parameter Constructor overloading refers to creating
called I, which is used to initialise the multiple constructors in a class with
instatnce variable, x. Thus, when the different parameter lists. This enables
line MyClass t1 =new MyClass (10) ; the creation of objects with different
executes, the value 10 is passed to I, which argument combinations, offering
is then assigned to x. flexibility in initialising objects to suit

The choice of constructor relies on you various scenarios. In Java, constructor
as a programmer depending on specific overloading is similar to method
requirements. If you prefer objects to always overloading. In method overloading,
have default values, a default constructor various method definitions are generated
could be adequate. Nevertheless, if you according to different parameters.
require greater control over initialisation or Through constructor overloading, you
the flexibility to create objects with varying can achieve diverse approaches to object
initial states, parameterised constructors initialisation, accommodating varying
become necessary. numbers of parameters. Following is a

351
Student’s Book Form Five

Computer Science Form 5.indd 351 23/07/2024 12:34