Wrapper Class
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It provides a way to use primitive data type as a reference data type.
Sample Program of wrapper class:
public class WrapperClassExample {
public static void main(String[] args) {
// Primitive data types
int intValue = 42;
double doubleValue = 3.14;
char charValue = 'A';
// Using wrapper classes
Integer integerObject = Integer.valueOf(intValue); // Wrapping int
Double doubleObject = Double.valueOf(doubleValue); // Wrapping double
Character charObject = Character.valueOf(charValue); // Wrapping char
System.out.println("Primitive Values:");
System.out.println("int: " + intValue);
System.out.println("double: " + doubleValue);
System.out.println("char: " + charValue);
System.out.println("\nWrapper Class Values:");
System.out.println("Integer: " + integerObject);
System.out.println("Double: " + doubleObject);
System.out.println("Character: " + charObject);
// Unwrapping - getting primitive values back
int unwrappedInt = integerObject.intValue();
double unwrappedDouble = doubleObject.doubleValue();
char unwrappedChar = charObject.charValue();
System.out.println("\nUnwrapped Values:");
System.out.println("Unwrapped int: " + unwrappedInt);
System.out.println("Unwrapped double: " + unwrappedDouble);
System.out.println("Unwrapped char: " + unwrappedChar);
}
}
Labels: Java
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