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Write a Java Program to implement private constructors
PROGRAM: Java Program to implement private constructors
/*Java Program to implement private constructors*/
1: Java program to create a private constructor
class Test {
// create private constructor
private Test () {
System.out.println(“This is a private constructor.”);
}
// create a public static method
public static void instanceMethod() {
// create an instance of Test class
Test obj = new Test();
}
}
class Main {
public static void main(String[] args) {
// call the instanceMethod()
Test.instanceMethod();
}
}
2: Java Singleton design using a private constructor
class Language {
// create a public static variable of class type
private static Language language;
// private constructor
private Language() {
System.out.println(“Inside Private Constructor”);
}
// public static method
public static Language getInstance() {
// create object if it’s not already created
if(language == null) {
language = new Language();
}
// returns the singleton object
return language;
}
public void display() {
System.out.println(“Singleton Pattern is achieved”);
}
}
class Main {
public static void main(String[] args) {
Language db1;
// call the getInstance method
db1= Language.getInstance();
db1.display();
}
}
