java判断一个时间段是否与另外几个时间段重合

可以使用Java中的DateTime API来判断时间段是否重合。具体实现可以参考以下步骤：

1. 创建需要判断是否重合的时间段对象和已有时间段的对象列表。

```java
// 创建需要判断是否重合的时间段对象
LocalDateTime start1 = LocalDateTime.of(2021, 1, 1, 9, 0);
LocalDateTime end1 = LocalDateTime.of(2021, 1, 1, 10, 0);
Duration duration1 = Duration.between(start1, end1);

// 创建已有的时间段对象列表
List<Duration> durations = new ArrayList<>();
LocalDateTime start2 = LocalDateTime.of(2021, 1, 1, 8, 30);
LocalDateTime end2 = LocalDateTime.of(2021, 1, 1, 9, 30);
Duration duration2 = Duration.between(start2, end2);
durations.add(duration2);

LocalDateTime start3 = LocalDateTime.of(2021, 1, 1, 10, 0);
LocalDateTime end3 = LocalDateTime.of(2021, 1, 1, 11, 0);
Duration duration3 = Duration.between(start3, end3);
durations.add(duration3);
```

2. 遍历已有时间段列表，使用overlaps()方法判断需要判断的时间段是否重合。

```java
for (Duration duration : durations) {
    if (duration1.overlaps(duration)) {
        System.out.println("时间段重合");
        break;
    }
}
```

完整代码示例：

```java
import java.time.Duration;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        // 创建需要判断是否重合的时间段对象
        LocalDateTime start1 = LocalDateTime.of(2021, 1, 1, 9, 0);
        LocalDateTime end1 = LocalDateTime.of(2021, 1, 1, 10, 0);
        Duration duration1 = Duration.between(start1, end1);

        // 创建已有的时间段对象列表
        List<Duration> durations = new ArrayList<>();
        LocalDateTime start2 = LocalDateTime.of(2021, 1, 1, 8, 30);
        LocalDateTime end2 = LocalDateTime.of(2021, 1, 1, 9, 30);
        Duration duration2 = Duration.between(start2, end2);
        durations.add(duration2);

        LocalDateTime start3 = LocalDateTime.of(2021, 1, 1, 10, 0);
        LocalDateTime end3 = LocalDateTime.of(2021, 1, 1, 11, 0);
        Duration duration3 = Duration.between(start3, end3);
        durations.add(duration3);

        // 遍历已有时间段列表，判断时间段是否重合
        for (Duration duration : durations) {
            if (duration1.overlaps(duration)) {
                System.out.println("时间段重合");
                break;
            }
        }
    }
}
```