getDeclaredConstructors() : Get all the constructors declared in this class

getDeclaredConstructors() returns all the constructors declared by the class represented by this Class object.

class Employee {
    String firstName, lastName;
    int id, age;
    
    Employee(String firstName){
        this.firstName = firstName;
    }
    
    public Employee(String firstName, String lastName){
        this.firstName = firstName;
        this.lastName = lastName;
    }
    
    public Employee(){
        
    }
    
    Employee(String firstName, String lastName, int id){
        this.firstName = firstName;
        this.lastName = lastName;
        this.id = id;
    }
    
     Employee(String firstName, String lastName, int id, int age){
        this.firstName = firstName;
        this.lastName = lastName;
        this.id = id;
        this.age = age;
    }
}

import java.lang.reflect.Constructor;

public class GetConstructors {
    public static void main(String args[]){        
        Constructor[] con = Employee.class.getDeclaredConstructors();
        
        System.out.println("List Of constructors available are");
        for(Constructor c : con){
            System.out.println(c);
        }
    }
}

Output

List Of constructors available are
Employee(java.lang.String,java.lang.String,int,int)
Employee(java.lang.String,java.lang.String,int)
public Employee()
public Employee(java.lang.String,java.lang.String)
Employee(java.lang.String)

There is another method 'getConstructors()' which return only public constructors.

import java.lang.reflect.Constructor;

public class GetConstructors {
    public static void main(String args[]){        
        Constructor[] con = Employee.class.getConstructors();
        
        System.out.println("List Of constructors available are");
        for(Constructor c : con){
            System.out.println(c);
        }
    }
}

Output

List Of constructors available are
public Employee()
public Employee(java.lang.String,java.lang.String)

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