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Java Program to Call One Constructor from another
In this article, we will understand how to call one constructor from another. The keyword 'this()' is used to invoke a constructor.
Below is a demonstration of the same. We will displaying sum and product of two numbers while using this() −
Input
Suppose our input is −
The numbers are defined as 12 and 30
Output
The desired output would be −
The sum is: 42 The product is: 360
Algorithm
Step 1 - START Step 2 - Declare an integer value namely my_sum Step 3 - In the main class, we define a ‘this’ reference to the numbers which would be used as input. Step 4 - This will call the ‘this’ constructor that invokes the current class constructor. Step 5 - Another ‘display’ function is used to display the sum. Step 6 - An object of the class is created, and the functions are invoked to display the result
Example 1
Here, the sum of two numbers is being computed.
public class Main {
int my_sum;
Main() {
this(12, 30);
}
Main(int my_input_1, int my_input_2) {
System.out.println("The numbers are defined as " +my_input_1 +" and " +my_input_2);
this.my_sum = my_input_1 + my_input_2;
}
void display() {
System.out.println("The sum is: " + my_sum);
}
public static void main(String[] args) {
Main my_object = new Main();
my_object.display();
}
}Output
The numbers are defined as 12 and 30 The sum is: 42
Example 2
Here, the product of two numbers is being computed.
public class Main {
int my_product;
Main() {
this(12, 30);
}
Main(int my_input_1, int my_input_2) {
System.out.println("The numbers are defined as " +my_input_1 +" and " +my_input_2);
this.my_product = my_input_1 * my_input_2;
}
void display() {
System.out.println("The product of the two values is: " + my_product);
}
public static void main(String[] args) {
Main my_object = new Main();
my_object.display();
}
}Output
The numbers are defined as 12 and 30 The product of the two values is: 360
Updated on: 22-Feb-2022
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