Autoboxing and Methods

autoboxing occurs whenever a primitive type must be converted into an object; auto-unboxing takes place whenever an object must be converted into a primitive type.

autoboxing/unboxing might occur when an argument is passed to a method, or when a value is returned by a method.

For example, consider this example:

public class Main {
  static int m(Integer v) {
    return v; // auto-unbox to int
  }
  public static void main(String args[]) {
    Integer iOb = m(100);
    System.out.println(iOb);
  }
}

1. Autoboxing and auto-unboxing
2. Autoboxing and Methods
3. Autoboxing/Unboxing in Expressions