Discussions

Another way might be that you make all your instruction methods return a boolean value and place the following line at the end of each one: <Code Omitted>Then, your code would look like this: <Code Omitted>The semi-colon at the end of the while loop acts as an empty block of code to execute (no operations).

The method can not only be used for specific Actor objects, but also the World object; and it can also be used generically, where it does not matter what was clicked on, only that a click was detected. I often use it for specific Actor object where the code is placed in a World subclass. It is also used for cases where one wishes to detect when a mouse button was released (in situations where the pressing of the mouse is either unimportant or dealt with separately).

Asked and answered here.

Add an instance int field to the class to count down the act cycles it is to be frozen for. For each execution of the act method, if the value of the field is zero, then the actor is not frozen (act normally); if it is not zero, decrement its value. When it hits the object in question, set the value of the field to something around 50, or 60. This would look something like the following:

On this line: <Code Omitted>the single quotes around the three causes it to be treated as the character '3'. The character three has an int value of 51, which, obviously, is not 3. Remove the quotes from around the 3.

thank you very much!

This was just a try. I just want that the zombie dies not with one hit but with few hits depending on the damage the Bullet does. for example: Bullet does 5 damage and the zombie has 10 hitpoint so he dies with 2 hits.

Yes, it does have something to do with vectors; but, you do not have to deal with them directly. You can use the 'turnTowards' method of the Actor class to direct the "projectiles" toward your tank.

The code supplied cannot throw that exception, unless you misplaced the last line of code given (it should be in act method or method called by the act method).

I am finding it difficult to follow your code here. I presume that the code is in a ShootingBall class, which creates ShootingBall objects. It does not matter what image you give the objects, they will always be ShootingBall objects. If you want to turn one into a brick, add a new brick object and remove the ShootingBall object ('this'). Possibly you should have an Arrow class also to do similarly with, instead of calling 'buildUpArrowImage'. With these changes, in all cases, no ShootingBall object will be in the world; so, your world class can just ask one question to shoot a new ball:

??? Maybe copy the first loop and change the y-coordinate value ???

The first statement within the method will reset the value of 'fuelElapsed' back to '100' every time the method is called. Its value should be set to 100 when the Rocket object is created (or when it is added into the world). Next, "Space" should be "space" (with a lowercase 's'). The two lines executed when the spacebar is pressed are both problematic. The first line will automatically sets 'fuelElapsed' to a value less then '10' and the second line called the method that is currently being executed. This is not unlike an infinite loop and will freeze the program until an exception is th

The method is in the TrafficLight class, not the Actor class. Therefore, the field holding the TrafficLight object needs to hold a TrafficLight object, not just any Actor object: <Code Omitted>

thnx

anytime