background
Because the basic data types do not have object-oriented characteristics. So each basic data type corresponds to a packaging class.
| Basic data type | Corresponding packaging |
|---|---|
| byte | Byte |
| short | Short |
| int | Interger |
| long | Long |
| float | Float |
| double | Double |
| char | Character |
| boolean | Boolean |
Conversion of basic data types and packaging classes
Packing (basic -> packing) and
unpacking (packing -> basic)
after jdk1.5 supports automatic packing and unpacking
int a = 10;
// 手动装箱
Interger interger = new Interger(a);
// 自动装箱
Interger interger = a;
// 手动拆箱
int b = interger.intValue();
// 自动拆箱
int b = interger;