WrapperClassDemo.java

public class WrapperClassDemo {
    public static void main(String[] args) {
        // Demonstrating Integer wrapper class methods
        Integer intObj = Integer.valueOf(42); // Boxing
        int intValue = intObj.intValue(); // Unboxing
        System.out.println("Integer value: " + intValue);

        // Parsing a string to an integer
        String intString = "123";
        int parsedInt = Integer.parseInt(intString);
        System.out.println("Parsed Integer: " + parsedInt);

        // Comparing two Integer objects
        Integer anotherIntObj = Integer.valueOf(42);
        System.out.println("Comparison: " + intObj.compareTo(anotherIntObj));

        // Demonstrating Double wrapper class methods
        Double doubleObj = Double.valueOf(3.14);
        double doubleValue = doubleObj.doubleValue();
        System.out.println("Double value: " + doubleValue);

        // Parsing a string to a double
        String doubleString = "3.14159";
        double parsedDouble = Double.parseDouble(doubleString);
        System.out.println("Parsed Double: " + parsedDouble);

        // Checking if a value is infinite or NaN
        System.out.println("Is Infinite: " + doubleObj.isInfinite());
        System.out.println("Is NaN: " + doubleObj.isNaN());

        // Demonstrating Character wrapper class methods
        Character charObj = Character.valueOf('A');
        char charValue = charObj.charValue();
        System.out.println("Character value: " + charValue);

        // Checking character properties
        System.out.println("Is Letter: " + Character.isLetter(charValue));
        System.out.println("Is Digit: " + Character.isDigit(charValue));

        // Demonstrating Boolean wrapper class methods
        Boolean boolObj = Boolean.valueOf(true);
        boolean boolValue = boolObj.booleanValue();
        System.out.println("Boolean value: " + boolValue);

        // Parsing a string to a boolean
        String boolString = "true";
        boolean parsedBoolean = Boolean.parseBoolean(boolString);
        System.out.println("Parsed Boolean: " + parsedBoolean);

        // Demonstrating static methods
        System.out.println("Integer Max Value: " + Integer.MAX_VALUE);
        System.out.println("Double Min Value: " + Double.MIN_VALUE);
        System.out.println("Character Lowercase: " + Character.toLowerCase('B'));
    }
}