'void' type not allowed here (java) error [closed]

问题

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Closed 6 years ago.

Here is my code:

public void start()
{
  //If the gas tank and oil have more than nothing, and the transmission is in gear park, then the car can start
  if((gasTank.getGasLevel() > 0) && (engine.getOilLevel() > 0) && (transmission.gearPark()))
  {
    engine.startEngine();
    System.out.println("Engine is now on");
  }
  else
  {
    System.out.println("Please make sure your car is in proper gear, engine has oil and gas.");
  }
}

I keep getting 'void' type not allowed here error. I am not trying to return anything so I know I don't need int, Boolean, double, etc.

What am I doing wrong?

回答1:

Your code is not inside a class.

Try this:

public class SomeClass {
    // your method here
}

回答2:

It looks like one or more of these methods might be void, but must not be:

getGasLevel(); 
getOilLevel();
gearPark()

They must not be void because you are checking values returned from them in the if statement.

来源：https://stackoverflow.com/questions/15019723/void-type-not-allowed-here-java-error