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<!-- GFM-TOC -->
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
* [????](#????)
* [ final](#-final)
* [<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>](#<23><>ʼ<EFBFBD><CABC>˳<EFBFBD><CBB3>)
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD>](#<23><><EFBFBD><EFBFBD>Ȩ<EFBFBD><C8A8>)
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
* [????????](#????????)
* [???????](#???????)
* [????](#????)
* [Set](#set)
* [Queue](#queue)
* [Map](#map)
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
* [<EFBFBD>쳣](#<EFBFBD>쳣)
* [<EFBFBD>ο<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23>ο<EFBFBD><CEBF><EFBFBD><EFBFBD><EFBFBD>)
* [????](#????)
* [??](#??)
* [?<3F><>?????](#?<3F><>?????)
<!-- GFM-TOC -->
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
# ????
## final
**final <EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
**final ????**
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DZ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܱ<EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
??????????????????????????????????????????????????????????????????
<EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>final ʹ<><CAB9>ֵ<EFBFBD><D6B5><EFBFBD>䣻<EFBFBD><E4A3BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ö<EFBFBD><C3B6><EFBFBD><EFBFBD><EFBFBD>final ʹ<><CAB9><EFBFBD>ò<EFBFBD><C3B2>䣬Ҳ<E4A3AC>Ͳ<EFBFBD><CDB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󣬵<EFBFBD><F3A3ACB5>DZ<EFBFBD><C7B1><EFBFBD><EFBFBD>õĶ<C3B5><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǿ<EFBFBD><C7BF><EFBFBD><EFBFBD>޸ĵġ<C4B5>
????????????final ???????????????????final ????<3F><>?????????????????????????????????????????????
**final <EFBFBD><EFBFBD><EFBFBD><EFBFBD>**
**final ????**
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>า<EFBFBD>ǡ<EFBFBD>
????????????????????
private <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD>ر<EFBFBD>ָ<EFBFBD><EFBFBD>Ϊ final<61><6C><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><D0B6><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD>ͻ<EFBFBD><CDBB><EFBFBD><EFBFBD>е<EFBFBD>һ<EFBFBD><D2BB> private <20><><EFBFBD><EFBFBD>ǩ<EFBFBD><C7A9><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǹ<EFBFBD><C7B8>ǻ<EFBFBD><C7BB>෽<EFBFBD><E0B7BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ˡ<EFBFBD>
private ?????????????? final????????????<3F><>?????????????<3F><>???? private ????????????????????????????????????????????????
**final <EFBFBD><EFBFBD>**
**final ??**
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳С<EFBFBD>
????????????<3F><>?
## <EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>
## ????????
static <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ľ<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>ݣ<EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>һ<EFBFBD>Σ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݵij<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
static ??????????????????????????????????????????????????<3F><>??????????????????????
```java
public static String staticField = "<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>";
public static String staticField = "???????";
```
static <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> static <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>ʵ<EFBFBD><CAB5><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>һ<EFBFBD>Σ<EFBFBD><CEA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD>е<EFBFBD>˳<EFBFBD><CBB3><EFBFBD><EFBFBD>
static ????? static ???????????????????????????<3F><>?????????????????????????????<3F><>????
```java
static {
System.out.println("<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>");
System.out.println("??????????");
}
```
<EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD>ݺ<EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>ھ<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>ݺ;<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
??????????????????????????????????????????????
```java
public String field = "<EFBFBD><EFBFBD><EFBFBD><EFBFBD>";
public String field = "????";
```
```java
{
System.out.println("<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>");
System.out.println("???????");
}
```
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǹ<EFBFBD><EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽ<EFBFBD><EFBFBD>г<EFBFBD>ʼ<EFBFBD><EFBFBD>
????????????<3F><>???????<3F><>????
```java
public InitialOrderTest()
{
System.out.println("<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>");
System.out.println("??????");
}
```
<EFBFBD><EFBFBD><EFBFBD>ڼ̳е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>£<EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>
?????<3F><>??????????????????
1. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飩
2. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飩
3. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飩
4. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
5. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飩
6. <EFBFBD><EFBFBD><EFBFBD>ࣨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
1. ??????????????????<3F><>
2. ??????????????????<3F><>
3. ????????????<3F><>
4. ????????????
5. ????????????<3F><>
6. ????????????
## <EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD>
## ???????
Java <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><EFBFBD><EFBFBD>private<EFBFBD><EFBFBD>protected <EFBFBD>Լ<EFBFBD> public<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD>
Java ??????????????????<3F><>???private??protected ??? public???????????????<3F><>???????????????
<EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еij<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD><EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD>ó<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ഴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󣬿<EFBFBD><EFBFBD>԰<EFBFBD><EFBFBD>൱<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾһ<EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ˡ<EFBFBD>
???????????<3F><>???????????????????????????<3F><>??????????????????????<3F><>?????????????????<3F><>????????????????????????????????????????????<3F><>??????????????????????????????????
protected <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>γ<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD>ڼ̳<EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD>г<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>壬<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>û<EFBFBD>м̳<EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD>
protected ???????<3F><>???????????????<3F><>????????????????????????????<3F><>?????????????<3F><>???????<3F><>???????
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
# ????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/114c49a6-72e3-4264-ae07-c564127094ac.png)
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> Collection <EFBFBD><EFBFBD> Map <EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>Collection <EFBFBD>ְ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> List<EFBFBD><EFBFBD>Set <EFBFBD>Լ<EFBFBD> Queue<EFBFBD><EFBFBD>
??????????? Collection ?? Map ?????Collection ??????? List??Set ??? Queue??
## Set
- HashSet<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> Hash ʵ<EFBFBD>֣<EFBFBD>֧<EFBFBD>ֿ<EFBFBD><EFBFBD>ٲ<EFBFBD><EFBFBD>ң<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧȥ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD>
- HashSet????? Hash ???????????????????????????
- TreeSet<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򣬵<EFBFBD><EFBFBD>Dz<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ʲ<EFBFBD><EFBFBD><EFBFBD> HashSet<EFBFBD><EFBFBD>
- TreeSet?????????????????????????<3F><>????? HashSet??
- LinkedListHashSet<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> HashSet <EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ʣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ά<EFBFBD><EFBFBD>Ԫ<EFBFBD>صIJ<EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˾<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԡ<EFBFBD>
- LinkedListHashSet?????? HashSet ?????<3F><>?????????????????????????????????????????
## Queue
ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD>LinkedList <EFBFBD><EFBFBD> PriorityQueue<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> LinkedList ֧<EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>С<EFBFBD>
???????????LinkedList ?? PriorityQueue?????? LinkedList ????????<3F><>?
## Map
- HashMap<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> Hash ʵ<EFBFBD><EFBFBD>
- HashMap????? Hash ???
- LinkedHashMap<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ã<EFBFBD>LRU<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>
- LinkedHashMap???????????????????????????????????LRU?????
- TreeMap<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD>
- TreeMap?????????????
- ConcurrentHashMap<EFBFBD><EFBFBD><EFBFBD>̰߳<EFBFBD>ȫ Map<61><70><EFBFBD><EFBFBD><EFBFBD>漰ͬ<E6BCB0><CDAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
- ConcurrentHashMap??????? Map?????<3F>p???????
# <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
# ????
ÿ<EFBFBD><EFBFBD><EFBFBD>඼<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> **Class** <EFBFBD><EFBFBD><EFBFBD>󣬰<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>йص<EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> .class <20>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD>ݱ<EFBFBD><DDB1><EFBFBD><EFBFBD><EFBFBD> Class <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
?????????? **Class** ??????????????<3F><>???????????????????????????????????? .class ??????????????????? Class ????
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>൱<EFBFBD><EFBFBD> Class <20><><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC>ء<EFBFBD><D8A1><EFBFBD><EFBFBD>ڵ<EFBFBD>һ<EFBFBD><D2BB>ʹ<EFBFBD><CAB9>ʱ<EFBFBD>Ŷ<EFBFBD>̬<EFBFBD><CCAC><EFBFBD>ص<EFBFBD> JVM <20>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9> Class.forName('com.mysql.jdbc.Driver.class') <EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>ʽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD>أ<EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD>᷵<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> Class <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
????????? Class ?????????????????????????????? JVM ?<3F><>???????? Class.forName('com.mysql.jdbc.Driver.class') ????????????????????<3F><>?????????? Class ????
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ż<EFBFBD><EFBFBD>ؽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڱ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ڸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> .class <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD>Լ<EFBFBD><D4BC>ؽ<EFBFBD><D8BD><EFBFBD><EFBFBD><EFBFBD>
???????????????????????????????????????????????????????????????????? .class ???????????????????
Class <EFBFBD><EFBFBD> java.lang.reflect һ<EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṩ<EFBFBD><EFBFBD>֧<EFBFBD>֣<EFBFBD>java.lang.reflect <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> **Field**<EFBFBD><EFBFBD>**Method** <EFBFBD>Լ<EFBFBD> **Constructor** <EFBFBD>ࡣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD> get() <EFBFBD><EFBFBD> set() <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>޸<EFBFBD> Field <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶΣ<D6B6><CEA3><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><CAB9> invoke() <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Method <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Constructor <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>µĶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Class ?? java.lang.reflect ???????????????java.lang.reflect ???????? **Field**??**Method** ??? **Constructor** ????????? get() ?? set() ???????????? Field ???????????<3F><>???????? invoke() ?????????? Method ???????????????????? Constructor ??????????
IDE ʹ<EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƻ<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֶΡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>͹<EFBFBD><EFBFBD>캯<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD>г<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
IDE ??<3F><>???????????????????????????????????????????<3F><>??????????????????<3F><>???????????
# <EFBFBD>쳣
# ??
Throwable <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD>κο<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>쳣<EFBFBD>׳<EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>**Error** <EFBFBD><EFBFBD> **Exception**<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Error <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
Throwable ????????????<3F>ʦ<EFBFBD>???????????????????????**Error** ?? **Exception**?????? Error ??????????????????
Exception <EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD>**<2A>ܼ<EFBFBD><DCBC>쳣** <EFBFBD><EFBFBD> **<EFBFBD><EFBFBD><EFBFBD>ܼ<EFBFBD><EFBFBD>쳣**<2A><><EFBFBD>ܼ<EFBFBD><DCBC>쳣<EFBFBD><ECB3A3>Ҫ<EFBFBD><D2AA> try...catch... <20><><EFBFBD>䲶<EFBFBD>񲢽<EFBFBD><F1B2A2BD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҿ<EFBFBD><D2BF>Դ<EFBFBD><D4B4>쳣<EFBFBD>лָ<D0BB><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܼ<EFBFBD><DCBC>쳣<EFBFBD>dz<EFBFBD><C7B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> Arithmetic Exception<6F><6E><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD><DEB7>ָ<EFBFBD><D6B8><EFBFBD>
Exception ????????**?????** ?? **???????**???????????? try...catch... ???????<3F><>??????????????<3F><>?????????????????????????????? 0 ?????? Arithmetic Exception???????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/48f8f98e-8dfd-450d-8b5b-df4688f0d377.jpg)
# <EFBFBD>ο<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
# ?<3F><>?????
- Eckel B, <EFBFBD><EFBFBD><EFBFBD>˶<EFBFBD> , <20><><EFBFBD><EFBFBD> , <EFBFBD><EFBFBD> . Java <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˼<EFBFBD><EFBFBD> [M]. <20><>е<EFBFBD><D0B5>ҵ<EFBFBD><D2B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD> , 2002.
- [Java <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD> ](https://segmentfault.com/a/1190000004527951)
- Eckel B, ????? , ??? , ?? . Java ?????? [M]. ??<3F><>????????? , 2002.
- [Java ????????? ](https://segmentfault.com/a/1190000004527951)

4
notes/算法.md
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@ -1,5 +1,5 @@
<!-- GFM-TOC -->
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23><><EFBFBD><EFBFBD>)
* [<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>](#<23><>һ<EFBFBD><EFBFBD>-<2D><><EFBFBD><EFBFBD>)
* [ջ](#ջ)
* [<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23><><EFBFBD><EFBFBD>)
* [<EFBFBD>㷨<EFBFBD><EFBFBD><EFBFBD><EFBFBD>](#<23>㷨<EFBFBD><E3B7A8><EFBFBD><EFBFBD>)
@ -86,7 +86,7 @@
* [4. ϡ<><CFA1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷<EFBFBD>](#4-ϡ<><CFA1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˷<EFBFBD>)
<!-- GFM-TOC -->
# <20><><EFBFBD><EFBFBD>
# <20><>һ<EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
## ջ