fail-fast 在 Java 中主要用于检测集合在并发修改下的结构性变化。在遍历过程中,如果结构发生了变化,例如删除了元素,Java 会立刻抛出 ConcurrentModificationException 异常。 fail-fast机制的背后是通过一个modCount变量来实现的。每次集合结构发生变化时,modCount的值会递增。迭代器在遍历时会检查modCount是否变化。如果...
The following is an example of Fail-Safe in Java: Open Compiler import java.util.concurrent.ConcurrentHashMap; import java.util.Iterator; public class FailSafeExample { public static void main(String[] args) { // Creating a ConcurrentHashMap ConcurrentHashMap<String, Integer> map = new Concurre...
there is no term as fail-safe given in many places as Java SE specifications does not use this term. I am using fail safe to segregate between Fail fast and Non fail-fast iterators.
are Fail-Safe in nature. Sample Java code to demonstrate Fail-safe iterators public class FailSafeExample { static public void main(String[] args) { ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("Dhoni", 7); map.put("Virat", 18); map.put("Chris", 333...
Iterator of CopyOnWriteArrayList is an example of fail-safe Iterator also iterator provided by ConcurrentHashMap keySet isfail-safeand never throws ConcurrentModificationException. Look at the following example of a fail-safe iterator publicclassFailSafeTest {publicstaticvoidmain(String[] args) { ...
5. When to use fail fast and fail safe Iterator Use fail safe iterator when you are not bothered about Collection to be modified during iteration, as fail fast iterator will not allow that. Unfortunately you can't choose failsafe or fail fast iterator, it depends upon which Collection class...
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{skipTests}</skipTests> <excludes> <exclude>**/*IntegrationTest.java</exclude> </excludes> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-failsafe-plugin</artifactId> <configuration> <parallel>classes</parallel> <threadCount>10</thr...
fast. Even if the underlying collection is modified, it does not fail by throwing ConcurrentModificationException. When an iterator is created, either it is directly created on the collection, or created on a clone of that collection. One example which supports failsafe iterator is ConcurrentHash...
Example of Fail Safe Iterator in Java: // Java code to illustrate// Fail Safe Iterator in Javaimportjava.util.concurrent.CopyOnWriteArrayList;importjava.util.Iterator;classFailSafe {...