NullPointerException* Du försökte accessa ett objekt (antingen ett fält i ett objekt eller ett objekts meddelande). Det gick inte på grund av att referensen du använde för att nå objektet var 'null'. Till exempel: Du skrev "thing.print()", and "thing" var 'null'. ArithmeticException* Något gick fel vid en aritmetisk operation, tex. division med 0. StringIndexOutOfBoundsException* You have tried to access a character or a substring in a string , and the index you used does not exist in that string. For example, you may have tried to access the fifth character in a string that is only three characters long. For the substring operation, remember that the second parameter is the length of the substring, not the end index. ClassCastException* You used a "cast" - that is an instruction assigning a different static type to an object, such as in this example: (String)someObject Here, "someObject" is cast to "String". This is legal only if the object stored in someObject really is of type String. In other words: you can cast to type T only if the object you are casting is of type T or one of its subtypes. In your case it wasn't. IndexOutOfBoundsException* An index of some sort (such as to an array, to a string, or to a vector) is out of range. "Out of range" means that the index does not exist in the array or other collection (e.g. you tried to access element 5, but only three elements exist). ArrayIndexOutOfBoundsException* An array index is out of range. "Out of range" means that the index does not exist in the array (e.g. you tried to access element 5, but only three elements exist). The legal index range is 0..arraylength-1. ConcurrentModificationException* You are doing an iteration over a collection here. While you are doing this, the collection was modified. That's a problem. You are not allowed to modify the collection during an iteration. Or the other way around: you cannot continue the iteration after modifying the collection. The only modification allowed during an iteration is removing elements with the Iterator's remove method (NOT the remove in the collection itself). ArrayStoreException* No help available - sorry. CannotRedoException* No help available - sorry. CannotUndoException* No help available - sorry. CMMException* No help available - sorry. EmptyStackException* No help available - sorry. IllegalArgumentException* No help available - sorry. IllegalMonitorStateException* No help available - sorry. IllegalPathStateException* No help available - sorry. IllegalStateException* No help available - sorry. ImagingOpException* No help available - sorry. MissingResourceException* No help available - sorry. NegativeArraySizeException* No help available - sorry. NoSuchElementException* No help available - sorry. ProfileDataException* No help available - sorry. ProviderException* No help available - sorry. RasterFormatException* No help available - sorry. SecurityException* No help available - sorry. SystemException* No help available - sorry. UndeclaredThrowableException* No help available - sorry. UnsupportedOperationException* No help available - sorry. Exception Det här är ett generellt undantag som bara anger att något har gått fel. Jag har ingen aning om vad...