1  public class datatypes {
 2    //Types of Datatypes 
 3    /*
 4     * Primitive: Built-in data types like int, short, char, String etc. 
 5     * Non-primitive: User-defined data type like class, function. 
 6     * Derived: Data types is derived from Primitive or Non-primitive like array, hashmap, ArrayList. 
 7     */
 8  
 9    //Wrapper class 
10    //Used to convert primitive data type into a java object. 
11    //int --> Integer 
12    //float --> Float 
13    //char --> Character 
14    //long --> Long 
15    //boolean --> Boolean 
16  
17    public static void main(String[] args) {
18      int a = 10;     //Primitive data type 
19      Integer b = 20;   //Wrapper Class 
20  
21      float c = 10.23f; 
22      Float d = 20.46f;
23  
24      char e = 'C'; 
25      Character f = 'D'; 
26  
27      var a1 = 2;    //AUtomatically Converts to int 
28      var b1 = 2.4;  //Automatically converts to double
29      var c1 = 8.4f; //Float 
30      var s1 = "Hello";
31  
32      System.out.println("a: " + a + " b: " + b + " c: " + c + " d: " + d + " e: " + e + " f: " + f);
33  
34      System.out.println("var Keyword");
35  
36      System.out.println("a1: " + a1 + " b1: " + b1 + " c1: " + c1 + " s1: " + s1);
37  
38    }
39  }