更新并发

CodeCoderCoding · CodeCoderCoding · commit 668ff03d650d · 2022-06-03T16:48:41.000+08:00
diff --git a/src/DGenericContainer/List_ArrayList/RemoveItem.java b/src/DGenericContainer/List_ArrayList/RemoveItem.java
@@ -27,10 +27,12 @@ public static void main(String[] args) {
      * 错误
      */
     public static void removeWithFor(List<String> list, String target){
+        System.out.println(list.size());
         for(int i = 0; i < list.size(); i++){
             String item = list.get(i);
-            if(target.equals(item)){
+            if(item.equals(target)){
                 list.remove(item);
+                System.out.println(list.size());
             }
         }
     }
diff --git a/src/DGenericContainer/List_CopyOnWriteList/CopyOnWriteListDemo.java b/src/DGenericContainer/List_CopyOnWriteList/CopyOnWriteListDemo.java
@@ -0,0 +1,55 @@
+package DGenericContainer.List_CopyOnWriteList;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/**
+ * @ClassName CopyOnWriteListDemo
+ * @Description
+ * @Date 2022/5/12 22:07
+ * @Version 1.0.0
+ **/
+public class CopyOnWriteListDemo {
+
+    public static void main(String[] args) {
+        ArrayList<String> arrayList = new ArrayList<String>();
+        arrayList.add("target");
+        arrayList.add("https://cs.supremepole.com/");
+        arrayList.add("https://algorithm.supremepole.com/");
+        arrayList.add("https://interview.supremepole.com/");
+        removeWithFor(arrayList, "target");
+        //removeWithCopyOnWrite(arrayList, "target");
+        print(arrayList);
+    }
+
+    /*
+     * 错误
+     */
+    public static void removeWithFor(List<String> list, String target){
+        for(int i = 0; i < list.size(); i++){
+            String item = list.get(i);
+            if(target.equals(item)){
+                list.remove(item);
+            }
+        }
+    }
+
+    /*
+     * 正确,拷贝一份只读副本，然后遍历的时候遍历副本，删除的时候删除原来的list。
+     */
+    public static void removeWithCopyOnWrite(ArrayList<String> list, String target) {
+        final CopyOnWriteArrayList<String> cowList = new CopyOnWriteArrayList<String>(list);
+        for(String item : cowList) {
+            if (item.equals(target)) {
+                list.remove(item);
+            }
+        }
+    }
+
+    public static void print(ArrayList<String> arrayList){
+        for(String string:arrayList){
+            System.out.println(string);
+        }
+    }
+}
diff --git a/src/EConcurrency/Synchronized/Counter.java b/src/EConcurrency/Synchronized/Counter.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.Synchronized;
+package EConcurrency.Synchronized;
 
 /**
  * @author CodeCoderCoding
diff --git a/src/EConcurrency/Synchronized/UseCounter.java b/src/EConcurrency/Synchronized/UseCounter.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.Synchronized;
+package EConcurrency.Synchronized;
 
 /**
  * @author CodeCoderCoding
diff --git a/src/EConcurrency/ThreadLocal/ThreadLocalBasic.java b/src/EConcurrency/ThreadLocal/ThreadLocalBasic.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.ThreadLocal;
+package EConcurrency.ThreadLocal;
 
 /**
  * ThreadLocal基本使用
diff --git a/src/EConcurrency/ThreadLocal/ThreadLocalInit.java b/src/EConcurrency/ThreadLocal/ThreadLocalInit.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.ThreadLocal;
+package EConcurrency.ThreadLocal;
 
 public class ThreadLocalInit {
 	static ThreadLocal<Integer> local = new ThreadLocal<Integer>(){
diff --git a/src/EConcurrency/ThreadLocal/ThreadPoolProblem.java b/src/EConcurrency/ThreadLocal/ThreadPoolProblem.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.ThreadLocal;
+package EConcurrency.ThreadLocal;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
diff --git a/src/EConcurrency/ThreadLocal/ThreadPoolProblemSolution.java b/src/EConcurrency/ThreadLocal/ThreadPoolProblemSolution.java
@@ -1,4 +1,4 @@
-package EConcurrency.Secure.ThreadLocal;
+package EConcurrency.ThreadLocal;
 
 import java.lang.reflect.Field;
 import java.util.concurrent.*;

Original file line number	Diff line number	Diff line change
`@@ -27,10 +27,12 @@ public static void main(String[] args) {`
`27`	`27`	`* 错误`
`28`	`28`	`*/`
`29`	`29`	`public static void removeWithFor(List<String> list, String target){`
	`30`	`+ System.out.println(list.size());`
`30`	`31`	`for(int i = 0; i < list.size(); i++){`
`31`	`32`	`String item = list.get(i);`
`32`		`- if(target.equals(item)){`
	`33`	`+ if(item.equals(target)){`
`33`	`34`	`list.remove(item);`
	`35`	`+ System.out.println(list.size());`
`34`	`36`	`}`
`35`	`37`	`}`
`36`	`38`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-package EConcurrency.Secure.Synchronized;`
	`1`	`+package EConcurrency.Synchronized;`
`2`	`2`
`3`	`3`	`/**`
`4`	`4`	`* @author CodeCoderCoding`
Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-package EConcurrency.Secure.ThreadLocal;`
	`1`	`+package EConcurrency.ThreadLocal;`
`2`	`2`
`3`	`3`	`/**`
`4`	`4`	`* ThreadLocal基本使用`