EN
Java - copy sub-array
8 points
In this short article, we would like to show how to copy sub-array in Java.
Quick solution:
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int[] subarray = Arrays.copyOfRange(array, from, to);
In this section, you can find embedded function that lets to copy array part. Function accepts array, start and end indexes.
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import java.util.Arrays;2
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class Program {4
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public static void main(String[] args) {6
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int[] array = new int[] {1, 2, 3, 4, 5, 6};8
int[] subarray = Arrays.copyOfRange(array, 1, 4);9
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System.out.println(Arrays.toString(subarray));11
}12
}Output:
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[2, 3, 4]Note:
Arrays.copyOfRange()was introduced in Java 1.6.
Example Program.java file:
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public class Program {2
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public static void main(String[] args) {4
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int[] array = new int[] {1, 2, 3, 4, 5, 6};6
int[] subarray = ArrayUtils.copyArray(array, 1, 4);7
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System.out.println(Arrays.toString(subarray));9
}10
}Output:
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[2, 3, 4]
Example ArrayUtils.java file:
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import java.util.Arrays;2
import java.lang.IllegalArgumentException;3
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public class ArrayUtils {5
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public static int[] copyArray(int[] array, int start, int end) {7
if (start > end) {8
throw new IllegalArgumentException("The start index cannot be greater than the end index.");9
}10
int[] result = new int[end - start];11
System.arraycopy(array, start, result, 0, result.length);12
return result;13
}14
}
