Copy Constructor in Java

Copy Constructor in Java is the constructor that can be use to copy the value of an existing object to a new object. It means the new object will call the copy constructor for copying the value of an existing object. The copy constructor has a special parameter through which it can pass the reference of an existing object for the new object.

Syntax of copy constructor

public classname ( class obj)
		{
			Data=obj.data;
		}

Syntax Copy Constructor in Java

Example of Copy Constructor

Input Value

public class consv {
    int n;
    public consv (int t){
        n=t;
    }
    public consv (consv m){
        n=m.n;
    }
    public void show ()
    {
        System.out.println("data:"+n);
    }
    public static void main (String args []){
        consv a =new consv(20);
        a.show();
        consv b=a;
        b.show();
    }
}

Example of Copy Constructor in Java

Let’s run the code

Output Value

Constructor Overloading in Java

We know, we can define multiple constructor within a class but each constructor parameters must be different from other and this also proves the concept of method overloading.

Example of Constructor Overloading

public class consv {
 
    private String message;
  
    public consv(){
       message = "Basic Engineer";
    }
    public consv(String message){
       this.message = message;
    }
  
    public String getMessage(){
       return message ;
    }
  
    public void setMessage(String message){
       this.message = message;
    }
  
    public static void main(String[] args) {
       consv tester = new consv();
       System.out.println(tester.getMessage());
    
       consv tester1 = new consv("Hello Student how are you?");
       System.out.println(tester1.getMessage());  
    }
 }   

Example of Constructor Overloading

Let’s run the code

Output Value

This Keyword in Java

The ‘this’ keyword is use for referring data and method as current class data and method. Generally it is useful whenever class data and method’s local data have same name.

Syntax of this keyword

this.data/method;

Syntax of this keyword

Note: This.n=n;             Where, (first n is class data and second n is method data)

Example of this keyword

public class thiskeys {
    int n;
    public void input(int n)
    {
        this.n=n;
    }
    public void show()
    {
        System.out.println("input Value:"+n);
    }
    public static void main (String args[]){
        thiskeys p=new thiskeys();
        p.input (15);
        p.show();
    }
}

Example of this keyword

Let’s run the code

Output Value

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