Page 374 - Computer_Science_F5

BigClass(int age) {
this.age = age;
}
// Code shows overloaded constructor Chapter Five: Object oriented programming with Java
FOR ONLINE READING ONLY
BigClass(int age, String name) {
// Code invokes the parameterised constructor using “this”
this(age);
this.name = name;
}
// method to show information
void show() {
System.out.println(“Name: “ + name + “, Age: “ + age);
}
public static void main(String[] args) {
// creating objects of BigClass
BigClass objX = new BigClass(35600);
BigClass objY= new BigClass(600, “Malaria”);

// calling show method to present information
objX.show();
objY.show();
}
}

Output:

Figure 5.31: Output of "this" keyword in constructors

The first constructor accepts an age parameter, while the second constructor takes
both age and name parameters. To avoid repeating the initialisation logic, the second
constructor uses the “this” keyword to invoke the first constructor and pass the age
parameter. By doing this, you can eliminate the need for redundant code duplication.

(iv) Used for passing current object as argument

By using the “this” keyword, it is possible to pass the current instance of an object
as an argument to another method. This is demonstrated in Program Example 5.30.

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Student’s Book Form Five

Computer Science Form 5.indd 365 23/07/2024 12:34