Clock

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SystemClock
```
public interface Clock
```
A simple encapsulation to allowing timing

方法概要

所有方法实例方法抽象方法
限定符和类型	方法和说明
`boolean`	`isNowBefore(long endInMillis)` Tests if a point in time occurs before the `current time`.
`long`	`laterBy(long durationInMillis)` Computes a point of time in the future.
`long`	`now()`

- 方法详细资料
  - now
```
long now()
```
    返回:
    
    The current time in milliseconds since epoch time.
    
    另请参阅:
    
    System.currentTimeMillis()
  - laterBy
```
long laterBy(long durationInMillis)
```
    Computes a point of time in the future.
    
    参数:
    
    durationInMillis - The point in the future, in milliseconds relative to the current time.
    
    返回:
    
    A timestamp representing a point in the future.
  - isNowBefore
```
boolean isNowBefore(long endInMillis)
```
    Tests if a point in time occurs before the current time.
    
    参数:
    
    endInMillis - The timestamnp to check.
    
    返回:
    
    Whether the given timestamp represents a point in time before the current time.

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