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How to Get a slice of a primitive array in Java?
You can get a part of a Java array in between two specified indexes in various ways.
By Copying contents:
One way to do so is to create an empty array and copy the contents of the original array from the start index to the endIndex.
Example
import java.util.Arrays;
public class SlicingAnArray {
public static int[] sliceArray(int array[], int startIndex, int endIndex ){
int size = endIndex-startIndex;
int part[] = new int[size];
//Copying the contents of the array
for(int i=0; i<part.length; i++){
part[i] = array[startIndex+i];
}
return part;
}
public static void main(String args[]){
int intArray[] = {12, 14, 58, 225, 56, 96 , 3, 45, 8 };
intArray = sliceArray(intArray, 3, 7);
System.out.println(Arrays.toString(intArray));
}
}Output
[225, 56, 96, 3]
Using the copyOfRange() method
The copyOfRange() method of the java.util.Arrays class accepts an array, two integers representing start and end indexes and returns a slice of the given array which is in between the specified indexes.
Example
Live Demo
import java.util.Arrays;
public class SlicingAnArray {
public static void main(String args[]){
int intArray[] = {12, 14, 58, 225, 56, 96 , 3, 45, 8 };
intArray = Arrays.copyOfRange(intArray, 3, 7);
System.out.println(Arrays.toString(intArray));
}
}Output
[225, 56, 96, 3]
Using Java8 stream
Live Demo
import java.util.Arrays;
import java.util.stream.IntStream;
public class SlicingAnArray {
public static int[] sliceArray(int array[], int startIndex, int endIndex ){
int size = endIndex-startIndex;
int part[] = new int[size];
IntStream stream = IntStream.range(startIndex, endIndex).map(i->array[i]);
part = stream.toArray();
//Copying the contents of the array
for(int i=0; i<part.length; i++){
part[i] = array[startIndex+i];
}
return part;
}
public static void main(String args[]){
int intArray[] = {12, 14, 58, 225, 56, 96 , 3, 45, 8 };
intArray = sliceArray(intArray, 3, 7);
System.out.println(Arrays.toString(intArray));
}
}Output
[225, 56, 96, 3]
Updated on: 15-Oct-2019
660 Views
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