WrapperClasses.java

// Wrapper classes wrap around the primitve datatypes in java to enhance their functionality
 
public class WrapperClasses {
    public static void main(String[] args) {
        int x = 69;
        // Integer is the wrapper class that wraps around the primitve datatype int
        System.out.println(Integer.toHexString(x));
 
        // Example of Autoboxing
        // Automatically the primitive type is getting converted into an object of the wrapper class
        Integer y = 69; // Java automatically performs Integer.vauleOf(1)
 
        // Unboxing
        int i = y.intValue(); // Wrapper class object gets converted back to primitive type
        int j = y; // Autounboxing
 
        System.out.println(i);
        System.out.println(j);
 
        // While this works, toHexString is a static method and must be accessed via Integer
        System.out.println(y.toHexString(x));
 
        System.out.println(Integer.toHexString(1983892893));
 
        // IMPORTANT
        // Integer t = null; // Possible
        // int c = null; // Not Possible, ERROR
    }
}