object in java

Car mycar = new Car();

public class Lightsaber {
  // properties
  private boolean isOn;
  private Color color;
  
  // constructor
  public Lightsaber(Color color) {
    this.isOn = false;
    this.color = color;
  }
  
  // getters
  public Color getColor() {
    return color;
  }
  public boolean getOnStatus() {
    return isOn;
  }
  
  // setters
  public void turnOn() {
    isOn = true;
  }
  public void turnOff() {
    isOn = false;
  }
}



// Implementation in main method:
public class test {
  public static void main(String[] args) {
    Lightsaber yoda = new Lightsaber(green);
    yoda.turnOn();
  }
}
    

// Class Declaration 
  
public class Dog 
{ 
    // Instance Variables 
    String name; 
    String breed; 
    int age; 
    String color; 
  
    // Constructor Declaration of Class 
    public Dog(String name, String breed, 
                   int age, String color) 
    { 
        this.name = name; 
        this.breed = breed; 
        this.age = age; 
        this.color = color; 
    } 
  
    // method 1 
    public String getName() 
    { 
        return name; 
    } 
  
    // method 2 
    public String getBreed() 
    { 
        return breed; 
    } 
  
    // method 3 
    public int getAge() 
    { 
        return age; 
    } 
  
    // method 4 
    public String getColor() 
    { 
        return color; 
    } 
  
    @Override
    public String toString() 
    { 
        return("Hi my name is "+ this.getName()+ 
               ".\nMy breed,age and color are " + 
               this.getBreed()+"," + this.getAge()+ 
               ","+ this.getColor()); 
    } 
  
    public static void main(String[] args) 
    { 
        Dog tuffy = new Dog("tuffy","papillon", 5, "white"); 
        System.out.println(tuffy.toString()); 
    } 
} 

class Puppy() {
	String name;
	int age;
  
  
 	Puppy(String puppy_name, int puppy_age) {
    	name = puppy_name;
   		age = puppy_age;
 	}
  
  	public static void main(String[] args) {
     	Puppy rex = new Puppy("rex",4); 
    }
  
}

public class HelloWorld {
  public static void main(String[] args) {
    
    // how to use class in java
    class User{
    	
    	int score;
    	
    	// method that can be used outside the class
    	public boolean hasWon(){
    		if(score >= 100){
    			return true;
    		} else {
    			return false;
    		}
    	}
    }
    
    User dave = new User();
    
    dave.score = 20;
    
    System.out.println(dave.hasWon());
    
 
  }
}

class Number {
    	
    	int number;
    	
    	// square numbers
    	public boolean isSquare(){
    		
    		double squareRoot = Math.sqrt(number);
    		
    		
    		if(squareRoot == Math.floor(squareRoot))
    		{
    			return true;
    		} else {
    			return false;
    		}
    		
    	}
    	
    	// triangular numbers
    	public boolean isTriangular(){
    		
    		int x = 1;
    		
    		int triangularNumber = 1;
    		
    		while(triangularNumber < number){
    			
    			x++;
    			triangularNumber = triangularNumber + x;
    			
    		}
    		
    		if(triangularNumber == number){
    			return true;
    		} else {
    			return false;
    		}
    	}
    }
    
    // testing 
    Number myNumber = new Number();
    myNumber.number = 16;
    
    System.out.println(myNumber.isSquare());

//	Example : TestClass (Can be predefined or user-defined)
public class TestClass {
  // properties
  private int id = 111;
  
  // constructor
  public TestClass(){
    super();
  }
  
  // method
  public void test(){
    // some code here
  }
}

public class HelloWorld {
  public static void main(String[] args) {
    
    // how to use class in java
    class User{
    	
    	int score;
    }
    
    User dave = new User();
    
    dave.score = 20;
    
    System.out.println(dave.score);
    
 
  }
}

An object is a member or an "instance" of a class and has states and behaviors 
  in which all
of its properties have values that you either explicitly define or that 
  are defined by default
settings.
Class can be defined as a template/blueprint that describes the behavior
that the object of its type support.

slslegal.com

Class is a blueprint or template which you can create as many objects as you 
like. Object is a member or instance of a class.
Class is declared using class keyword, Object is created through
new keyword mainly. A class is a template for objects. A class defines 
object properties including a valid range of values, and a default value. 
A class also describes object behavior.