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优化格式 & 补充集合转Map时的常见异常 #2673

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Merged
merged 2 commits into from
May 13, 2025
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优化格式 & 补充集合转Map时的常见异常 #2673

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6f3f2c9
去除空格，优化格式
Wenweigood May 13, 2025
7980d03
集合转Map抛出异常的常见情形提醒
Wenweigood May 13, 2025
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1 change: 1 addition & 0 deletions docs/java/collection/java-collection-precautions-for-use.md
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Expand Up @@ -134,6 +134,7 @@ public static <T> T requireNonNull(T obj) {
return obj;
}
```
> `Collectors`也提供了无需mergeFunction的`toMap()`方法，但此时若出现key冲突，则会抛出`duplicateKeyException`异常，因此强烈建议使用`toMap()`方法必填mergeFunction。

## 集合遍历

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2 changes: 1 addition & 1 deletion docs/java/concurrent/java-concurrent-questions-02.md
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Expand Up @@ -60,7 +60,7 @@ public class Singleton {
private Singleton() {
}

public static Singleton getUniqueInstance() {
public static Singleton getUniqueInstance() {
//先判断对象是否已经实例过，没有实例化过才进入加锁代码
if (uniqueInstance == null) {
//类对象加锁
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