60 wrapper class in java
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in java, wrapper classes are used to convert primitive data types into objects. each primitive type has a corresponding wrapper class in the `java.lang` package. wrapper classes provide a way to use primitive data types as objects, which is particularly useful when working with collections like `arraylist`, which can only hold objects.
here’s a list of the primitive types and their corresponding wrapper classes:
| primitive type | wrapper class |
|----------------|---------------|
| `boolean` | `boolean` |
| `byte` | `byte` |
| `char` | `character` |
| `short` | `short` |
| `int` | `integer` |
| `long` | `long` |
| `float` | `float` |
| `double` | `double` |
key features of wrapper classes
1. **object representation**: wrapper classes allow you to treat primitive types as objects.
2. **null value**: wrapper classes can hold a `null` value, whereas primitive types cannot.
3. **methods**: wrapper classes contain methods that can help in converting types, manipulating values, etc.
4. **autoboxing and unboxing**: java provides automatic conversion between primitive types and their corresponding wrapper classes, known as autoboxing (primitive to wrapper) and unboxing (wrapper to primitive).
example code
the following example demonstrates the use of wrapper classes in java, showcasing autoboxing, unboxing, and some common methods provided by these classes.
```java
import java.util.arraylist;
public class wrapperclassexample {
public static void main(string[] args) {
// autoboxing: converting primitive types to wrapper objects
integer intobject = 5; // integer.valueof(5);
double doubleobject = 5.5; // double.valueof(5.5);
boolean boolobject = true; // boolean.valueof(true);
// unboxing: converting wrapper objects back to primitive types
int intvalue = intobject; // intobject.intvalue();
double doub ...
#Java #WrapperClass #numpy
Java wrapper class
Integer class
Double class
Character class
Boolean class
Float class
Long class
Byte class
Short class
Object-oriented programming
Autoboxing
Unboxing
Primitive data types
Wrapper class methods
Java Collections
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