JAVA

constructor

public class ConsDemo {
   public static void main(String args[]) {
      MyClass t1 = new MyClass();
      MyClass t2 = new MyClass();
      System.out.println(t1.num + " " + t2.num);
   }
}

constructor

class Person {
    var children: MutableList<Person> = mutableListOf<>()
    constructor(parent: Person) {
        parent.children.add(this)
    }
}

Constructor

class MyMainEmployee{
    private int id;
    private String name;

    public MyMainEmployee(){
        id = 0;
        name = "Your-Name-Here";
    }
    public MyMainEmployee(String myName, int myId){
        id = myId;
        name = myName;
    }
    public MyMainEmployee(String myName){
        id = 1;
        name = myName;
    }
    public String getName(){
        return name;
    }
    public void setName(String n){
        this.name = n;
    }
    public void setId(int i){
        this.id = i;
    }
    public int getId(){
        return id;
    }
}

public class cwh_42_constructors {
    public static void main(String[] args) {
        //MyMainEmployee d = new MyMainEmployee("ProgrammingWithHarry", 12);
        MyMainEmployee d = new MyMainEmployee();
        //d.setName("Learn java");
        //d.setId(34);
        System.out.println(d.getId());
        System.out.println(d.getName());
    }
}

constructor definition

Constructor are a type of method 
* Share the name of class
* Called when you Instantiate a Class

Default Constructor accepts no Arguments

constructer

class Ball {
	constructor(w, h) {
		this.width = 100;
      this.height = 100;
	}
}