Java Program For this Keyword

Program 1

package testcoreproject;
class Employee
{
    //Instance variable
    private int id;
    private String name;
    private String dept;
 Employee(int id,String name,String dept)   // Local variable
 {
     this.id=id;
     this.name=name;
     this.dept=dept;
 }
  void display()    
  {
      System.out.println("ID :"+this.id);
      System.out.println("NAME :"+this.name);
      System.out.println("Department :"+this.dept);
  }
}

public class TestThis 
{
    public static void main(String[] args) 
    {
       Employee E=new Employee(101, "Vinit Sharma", "CS");
       E.display();
    }
    
}

Program 2

package testcoreproject;
class Employee1
{
    //Instance variable
    private int id;
    private String name;
    private String dept;

    public Employee1(int id, String name, String dept) {
        this.id = id;
        this.name = name;
        this.dept = dept;
    }

    @Override
    public String toString() {
        return "Employee{" + "id=" + id + ", name=" + name + ", dept=" + dept + '}';
    }
    
}    

public class TestThis1 
{
  public static void main(String[] args) 
    {
       Employee1 E=new Employee1(101, "Vinit Sharma", "CS");
        System.out.println(E);
    }    
}

Program 3

package testcoreproject;

class Employee2
{
    //Instance variable
    private int id;
    private String name;
    private String dept;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDept() {
        return dept;
    }

    public void setDept(String dept) {
        this.dept = dept;
    }
    
}
public class TestThis2 
{
    public static void main(String[] args) 
    {
       Employee2 E2=new Employee2();
       E2.setId(501);
       E2.setName("Vishal Verma");
       E2.setDept("Sales");
        System.out.println("ID "+E2.getId());
        System.out.println("NAME "+E2.getName());
        System.out.println("DEPARTMENT "+E2.getDept());
       
    }
    
}

Program 4

package testcoreproject;

class MyClassThis
{
      private void display()
      {
          System.out.println("Display Method of MyClassThis");
      }
      void show()
      {
              System.out.println("Show Method of MyClassThis");
              this.display();
      }
      
}
public class TestThisMethod 
{
    public static void main(String[] args) 
    {
       MyClassThis M=new MyClassThis();
       M.show();
    }
    
}

Program 5

package testcoreproject;

class MyClass2
{
    MyClass2()
    {
        this(344); 
        System.out.println("Non Parameter constructor of MyClass");
    
    }
    MyClass2(int x)
    {
        
        System.out.println("Parameter constructor of MyClass "+x);
    }
            
}
public class TestThisconstructor 
{
    public static void main(String[] args) 
    {
       // MyClass2 M2=new MyClass2();
        
        
    }
    
}