Boxing

• primitive를 Wrapper 클래스로 변환

  // Boxing
  Integer boxNum = new Integer(123);
  Integer boxNumValue = Integer.valueOf(123);
  // Auto-Boxing (JDK 1.5 over)
  Integer impilictedBoxNum = 123;

Unboxing

• Wrapper 클래스를 primitive 로 변환

  Integer boxedNum = new Integer(123);
  // Unboxing
  int unboxNum = boxedNum.intValue();
  // Auto-Unboxing (JDK 1.5 over)
  int implictedUnboxNum = boxedNum;