object in java

1Car mycar = new Car();

1public class Lightsaber {
2  // properties
3  private boolean isOn;
4  private Color color;
5  
6  // constructor
7  public Lightsaber(Color color) {
8    this.isOn = false;
9    this.color = color;
10  }
11  
12  // getters
13  public Color getColor() {
14    return color;
15  }
16  public boolean getOnStatus() {
17    return isOn;
18  }
19  
20  // setters
21  public void turnOn() {
22    isOn = true;
23  }
24  public void turnOff() {
25    isOn = false;
26  }
27}
28
29
30
31// Implementation in main method:
32public class test {
33  public static void main(String[] args) {
34    Lightsaber yoda = new Lightsaber(green);
35    yoda.turnOn();
36  }
37}
38    

1class Puppy() {
2	String name;
3	int age;
4  
5  
6 	Puppy(String puppy_name, int puppy_age) {
7    	name = puppy_name;
8   		age = puppy_age;
9 	}
10  
11  	public static void main(String[] args) {
12     	Puppy rex = new Puppy("rex",4); 
13    }
14  
15}

1public class Puppy {
2   public Puppy(String name) {
3      // This constructor has one parameter, name.
4      System.out.println("Passed Name is :" + name );
5   }
6
7   public static void main(String []args) {
8      // Following statement would create an object myPuppy
9      Puppy myPuppy = new Puppy( "tommy" );
10   }
11}

1
2public class HelloWorld {
3  public static void main(String[] args) {
4    
5    // how to use class in java
6    class User{
7    	
8    	int score;
9    }
10    
11    User dave = new User();
12    
13    dave.score = 20;
14    
15    System.out.println(dave.score);
16    
17 
18  }
19}
20

1Objects: came from class, we can create multiple objects from a class
2  ArrayList<>  list     =  new ArrayList<>();
3  Class     refName               OBJECT
4  
5 each object has its own copy of instance variable
6· declared outside the blocks or methods
7Object: Instance of the class. We can store different data's to objects
8Object Creation: with new keyword.     
9  ClassName obj = new ExistingConstructor;
10