Conversion between wrappers and primitives

public class ConversionDemo {
    public static void main(String[] args) {

        // Autoboxing: Primitive to Wrapper
        Integer intObj = Integer.valueOf(10);
        Double doubleObj = Double.valueOf(3.14);
        Boolean boolObj = Boolean.valueOf(true);

        System.out.println("Integer Object: " + intObj);
        System.out.println("Double Object: " + doubleObj);
        System.out.println("Boolean Object: " + boolObj);

        // Unboxing: Wrapper to Primitive
        int intPrimitive = intObj.intValue();
        double doublePrimitive = doubleObj.doubleValue();
        boolean boolPrimitive = boolObj.booleanValue();

        System.out.println("Primitive int: " + intPrimitive);
        System.out.println("Primitive double: " + doublePrimitive);
        System.out.println("Primitive boolean: " + boolPrimitive);

        // String to Wrapper
        Integer strToInt = Integer.valueOf("100");
        Double strToDouble = Double.valueOf("99.99");

        System.out.println("String to Integer: " + strToInt);
        System.out.println("String to Double: " + strToDouble);

        // Wrapper to String
        String intStr = intObj.toString();
        String doubleStr = doubleObj.toString();

        System.out.println("Integer to String: " + intStr);
        System.out.println("Double to String: " + doubleStr);

        // Parsing String to Primitive
        int parsedInt = Integer.parseInt("123");
        double parsedDouble = Double.parseDouble("45.67");

        System.out.println("Parsed int: " + parsedInt);
        System.out.println("Parsed double: " + parsedDouble);
    }
}
/*
Integer Object: 10
Double Object: 3.14
Boolean Object: true

Primitive int: 10
Primitive double: 3.14
Primitive boolean: true

String to Integer: 100
String to Double: 99.99

Integer to String: 10
Double to String: 3.14

Parsed int: 123
Parsed double: 45.67
*/