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java Programming Glossary: a.lengthcasting Object array to Integer array error http://stackoverflow.com/questions/1115230/casting-object-array-to-integer-array-error too. Integer integerArray Arrays.copyOf a a.length Integer .class Integer integerArray Arrays.copyOfRange a 0 a.length.. Integer .class Integer integerArray Arrays.copyOfRange a 0 a.length Integer .class Here the reason to hitting an ClassCastException..
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])? http://stackoverflow.com/questions/174093/toarraynew-myclass0-or-toarraynew-myclassmylist-size the source of ArrayList.toArray public T T toArray T a if a.length size Make a new array of a's runtime type but my contents return.. size a.getClass System.arraycopy elementData 0 a 0 size if a.length size a size null return a Use the first method so that only..
Managing highly repetitive code and documentation in Java http://stackoverflow.com/questions/2337170/managing-highly-repetitive-code-and-documentation-in-java if tt fromIndex lt 0 tt or tt toIndex gt a.length tt public static void fill long a int fromIndex int toIndex.. fill long a int fromIndex int toIndex long val rangeCheck a.length fromIndex toIndex for int i fromIndex i toIndex i a i val The..
How to flatten 2D array to 1D array? http://stackoverflow.com/questions/2569279/how-to-flatten-2d-array-to-1d-array the arrays all have the same length int newArray new int 3 a.length int index 0 for int n 0 n a.length n newArray index a n newArray.. int newArray new int 3 a.length int index 0 for int n 0 n a.length n newArray index a n newArray index b n newArray index c n or.. a b c can be of different lengths int newArray new int a.length b.length c.length System.arrayCopy a 0 newArray 0 a.length System.arrayCopy..
How to effectively copy an array in java? http://stackoverflow.com/questions/2589741/how-to-effectively-copy-an-array-in-java Arrays.copyOf to copy an array . public T T toArray T a if a.length size Make a new array of a's runtime type but my contents return.. size a.getClass System.arraycopy elementData 0 a 0 size if a.length size a size null return a How to compare these two copy methods..
http://stackoverflow.com/questions/2920315/permutation-of-array but I need a pseudo code algorithm like for int i 0 i a.length i code here Just algorithm. Yes API functions are good but..
Difference between null and “” Java String http://stackoverflow.com/questions/4802015/difference-between-null-and-java-string you can still invoke methods or functions on it like a.length a.substring 0 1 and so on. If the String equals null like b..
http://stackoverflow.com/questions/5785745/make-copy-of-array-java
How to merge two sorted arrays into a sorted array? http://stackoverflow.com/questions/5958169/how-to-merge-two-sorted-arrays-into-a-sorted-array public static int merge int a int b int answer new int a.length b.length int i 0 j 0 k 0 while i a.length j b.length if a i.. answer new int a.length b.length int i 0 j 0 k 0 while i a.length j b.length if a i b j answer k a i i else answer k b j j.. a i b j answer k a i i else answer k b j j k while i a.length answer k a i i k while j b.length answer k b j j k return..
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