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ClassNotFoundError ArrayList
Run the program by specifying fully classified name. It works! java arrayList.ArrayListStrings With out specifying package name, if you run it, it will throw NoClassDefFoundError.

Categories : Java

PrimeFaces 5.1 not being included properly
Turns out this was an issue in how Eclipse was deploying my project's EAR file to the app server. The WAR project wasn't set to include the Maven dependencies in the deployment assembly. Once I made that change it deployed as expected and Primefaces worked without issue.

Categories : Java

Reducing IF statement java
Since you are not going to have to modify this code later with more units, I would suggest you a ternary operator : String s = cbTwo.getValue(); showAnswer.setText(s.equals("Celsius") ? fahr.fahrenheitToCelsius() : s.equals("Farenheit") ? fahr.fahrenheitToFahrenheit() : kelvin.kelvinToKelvin()); Note that it is not exactly equivalent, in the case that s does not match any of thestrings you

Categories : Java

Designing a traffic light application
I wouldn't use timer at all. You would be better off looking at the ScheduledExecutorService for this sort of application.

Categories : Java

Recursion: Binary to Decimal
You don't have a base case; binary2Decimal (3-arg version) always calls itself. (Since the only thing changing from one call to the next is high, your base case should probably involve that somehow.)

Categories : Java

Java arraylist accessing an element to calculate average
The list numbers contains String objects, so casting the elements to double will throw an exception. You could have avoided this runtime exception if you had used the generic type ArrayList properly: ArrayList<String> numbers = new ArrayList<String>(); This would allow the compiler to detect ahead of time the type incompatibility. To read the double value of the string, you can use

Categories : Java

libGDX 3D rotate ModelInstance to the second one with a coefficient of rotation speed
Actually you should never rotate a ModelInstance to face another ModelInstance, but you should rotate it to an angle given by the gamelogic. That means, that you should sepperate the logic and the view. In this case the logic needs to store the currentAngle and the desiredAngle, as well as a rotationSpeed. The desiredAngle can be calculated out of the positions of the Tower and the Enemy. In the u

Categories : Java

HashMap initialization in java
Yes it is possible: public static <K,V> Map<K,V> mapFromArrays(K[] keys,V[]values){ HashMap<K, V> result=new HashMap<K, V>(); for(int i=0;i<keys.length;i++){ result.put(keys[i], values[i]); } return result; } Assuming that keys and values have the same length. You may also use this function in a static initializer like this: private static I

Categories : Java

What does @Proxy(lazy = false) do?
@Proxy(lazy=false) will disable the default lazy loading for a particular entity. This means you always get the initialized entity whenever this entity is being referenced from other entities. Using this annotation is usually a "code smell". If I were you I would remove it and simply load all entity associations using the join fetch directive or using @Subselect or @BatchSize eager loading.

Categories : Java




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