A constructor is a unique kind of function that is invoked automatically when a class instance is created. Static constructors are initialized by static members of a class, while constructors overload numerous constructor procedures within a class. Constructors has no return type and will be declared by the compiler if it is not defined.

Calling one constructor from another is known as constructor chaining. This procedure cuts down on repetition and reuses code. There are two syntactic options employing the chaining procedure, which are listed below.

Make use of the base class's constructor.

public ClassName() : base() { }

Call another constructor in the same class.
public ClassName() : this() { }

Real-time examples for constructor chaining with BankAccount class constructors are given here. Constructor overloading concept will be used to call the same class constructor by using 'this' keyword.
class BankAccount {
    String accountHolder;
    String accountType;
    double balance;

    // Default constructor
    public BankAccount() {
        this("Unknown", "Savings", 0.0); // Constructor chaining
    }

    // Constructor with accountHolder
    public BankAccount(String accountHolder) {
        this(accountHolder, "Savings", 0.0); // Constructor chaining
    }

    // Constructor with accountHolder and accountType
    public BankAccount(String accountHolder, String accountType) {
        this(accountHolder, accountType, 0.0); // Constructor chaining
    }

    // Full constructor
    public BankAccount(String accountHolder, String accountType, double balance) {
        this.accountHolder = accountHolder;
        this.accountType = accountType;
        this.balance = balance;
    }

    public void displayDetails() {
        System.out.println("Account Holder: " + accountHolder);
        System.out.println("Account Type: " + accountType);
        System.out.println("Balance: " + balance);
    }
}

public class Main {
    public static void main(String[] args) {
        BankAccount account1 = new BankAccount();
        BankAccount account2 = new BankAccount("aaa");
        BankAccount account3 = new BankAccount("bbb", "Current");
        BankAccount account4 = new BankAccount("cccc", "Savings", 5000.0);

        account1.displayDetails();
        account2.displayDetails();
        account3.displayDetails();
        account4.displayDetails();
    }
}

Output
Account Holder: Unknown
Account Type: Savings
Balance: 0.0

Account Holder: aaa
Account Type: Savings
Balance: 0.0

Account Holder: bbb
Account Type: Current
Balance: 0.0

Account Holder: cccc
Account Type: Savings
Balance: 5000.0