use java, The method decrements the car's speed by 3. You have to make sure that the car’s engine is on to apply the brake and the speed cannot be negative. The speed cannot be negative as a result of a break. If you hit break while the car is running at 3 miles/hour or less then hitting the break should reduce the speed to 0 miles/hour. It returns true if it can apply brake and reduce the speed by some amount and false, otherwise
时间: 2023-12-06 15:44:21 浏览: 28
Here's a possible implementation of the method you described in Java:
```java
public boolean applyBrake() {
if (engineOn && speed > 0) {
if (speed > 3) {
speed -= 3;
} else {
speed = 0;
}
return true;
} else {
return false;
}
}
```
In this implementation, we first check if the car's engine is on (`engineOn`) and if the speed is positive (`speed > 0`). If both conditions are true, we then check if the speed is greater than 3 miles/hour. If it is, we decrement the speed by 3. If it's not, we set the speed to 0.
Finally, we return `true` if we were able to apply the brake and reduce the speed by some amount, and `false` otherwise.
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