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Merged
pull merged 5 commits into from
Aug 4, 2021
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Merged

[pull] master from Snailclimb:master #167

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021b1f3
Update Java内存区域.md
liukun2634 Aug 1, 2021
64b247e
更新计算机网络中三次握手详情图
yamonc Aug 4, 2021
b9a3736
Merge pull request #1303 from kaka2634/master
Snailclimb Aug 4, 2021
03d0075
Merge pull request #1307 from yamonc/master
Snailclimb Aug 4, 2021
9876181
Update 计算机网络.md
Snailclimb Aug 4, 2021
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4 changes: 2 additions & 2 deletions docs/java/jvm/Java内存区域.md
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Expand Up @@ -174,8 +174,8 @@ JDK 8 版本之后方法区（HotSpot 的永久代）被彻底移除了（JDK1.7

堆这里最容易出现的就是 OutOfMemoryError 错误，并且出现这种错误之后的表现形式还会有几种，比如：

1. **`OutOfMemoryError: GC Overhead Limit Exceeded`** ： 当 JVM 花太多时间执行垃圾回收并且只能回收很少的堆空间时，就会发生此错误。
2. **`java.lang.OutOfMemoryError: Java heap space`** :假如在创建新的对象时, 堆内存中的空间不足以存放新创建的对象, 就会引发`java.lang.OutOfMemoryError: Java heap space` 错误。(和本机物理内存无关，和你配置的内存大小有关！)
1. **`java.lang.OutOfMemoryError: GC Overhead Limit Exceeded`** ： 当 JVM 花太多时间执行垃圾回收并且只能回收很少的堆空间时，就会发生此错误。
2. **`java.lang.OutOfMemoryError: Java heap space`** :假如在创建新的对象时, 堆内存中的空间不足以存放新创建的对象, 就会引发此错误。(和配置的最大堆内存有关，且受制于物理内存大小。最大堆内存可通过`-Xmx`参数配置，若没有特别配置，将会使用默认值，详见：[Default Java 8 max heap size](https://stackoverflow.com/questions/28272923/default-xmxsize-in-java-8-max-heap-size))
3. ......

### 2.5 方法区
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4 changes: 4 additions & 0 deletions docs/network/计算机网络.md
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Expand Up @@ -75,6 +75,10 @@
- 服务端–发送带有 SYN/ACK 标志的数据包–二次握手–客户端
- 客户端–发送带有带有 ACK 标志的数据包–三次握手–服务端

**详细示意图（图片来源不详）**

![](https://img-blog.csdnimg.cn/img_convert/0c9f470819684156cfdc27c682db4def.png)

### 2.2 为什么要三次握手

**三次握手的目的是建立可靠的通信信道，说到通讯，简单来说就是数据的发送与接收，而三次握手最主要的目的就是双方确认自己与对方的发送与接收是正常的。**
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