Is there a method that will copy a section of an array(not arraylist) and make a new array from it?
Example:
[1,2,3,4,5]
and you create a new array from it:
[1,2,3]
Are there any one line/methods that will do this?
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6 Answers
See the method Arrays.copyOfRange
Comments
Here's a java 1.4 compatible 1.5-liner:
int[] array = { 1, 2, 3, 4, 5 };
int size = 3;
int[] part = new int[size];
System.arraycopy(array, 0, part, 0, size);
You could do this in one line, but you wouldn't have a reference to the result.
To make a one-liner, you could refactor this into a method:
private static int[] partArray(int[] array, int size) {
int[] part = new int[size];
System.arraycopy(array, 0, part, 0, size);
return part;
}
then call like this:
int[] part = partArray(array, 3);
Comments
There is a pre-existing method in the java.util.Arrays: newArray = Arrays.copyOfRange(myArray, startindex, endindex). Or you could easily write your own method:
public static array[] copyOfRange(array[] myarray, int from, int to) {
array[] newarray = new array[to - from];
for (int i = 0 ; i < to - from ; i++) newarray[i] = myarray[i + from];
return newarray;
}
Comments
int [] myArray = [1,2,3,4,5];
int [] holder = new int[size];
System.arraycopy(myArray,0,holder,size);
where 0 stands for the index of source array from where copying should start. and
size stands for the number of copy operations. That you can changes according to your need.
copyOfRange of Arrays is there and many other ways by which this can be accomplished
1 Comment
Faahmed
You're missing one argument for it requires another int for destinationPosition.
Arrays#copyOfRange does the trick.
Comments
As others have stated, you can use Arrays.copyOfRange method. An example is :
String[] main = {"one", "two", "three", "four", "five"};
int from = 2;
int to = 4;
String[] part = Arrays.copyOfRange(main, from, to);
Now part will be : {"two", "three", "four"}
1 Comment
Juan
There is an error, part is
{"three", "four", "five"}, because arrays index starts at 0