lunedì 18 febbraio 2013

merge optimized of two arrays

the first code that you might think to write is:
String[] newArray = new String[firstArray.length + secondArray.length];
int index = 0;
for(int i = 0; i < firstArray.length: i++){
   newArray[index++] = firstArray[i];

for(int i = 0; i < secondArray.length: i++){
   newArray[index++] = secondArray[i];
This code is simple but slow, the best way to do this is to use system methods, as follow:
String[] newArray = Arrays.copyOf(firstArray, firstArray.length + secondArray.length);
System.arraycopy(secondArray, 0, newArray, firstArray.length, secondArray.length);  
This algorithm is three times faster and short.
good optimization :)

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