CODEWITHSUNDEEP
javaarrays
Gain
Gain

Reputation: 3863

How to create a sub array from another array in Java?

How to create a sub-array from another array? Is there a method that takes the indexes from the first array such as:

methodName(object array, int start, int end)

I don't want to go over making loops and making my program suffer.

I keep getting error:

cannot find symbol method copyOfRange(int[],int,int)

This is my code:

import java.util.*;

public class testing 
{
    public static void main(String [] arg) 
    {   
        int[] src = new int[] {1, 2, 3, 4, 5}; 
        int b1[] = Arrays.copyOfRange(src, 0, 2);
    }
}

Upvotes: 378

Views: 576882

Answers (10)

Hsabes
Hsabes

Reputation: 21

OP said they didn't want a for loop but in case anyone does:

int[] subArr = new int[end - start];

for (int i = 0; i < end - start; i++){
    subArr[i] = sourceArr[i + start];
}

Upvotes: 0

Nikita Zamalyutdinov
Nikita Zamalyutdinov

Reputation: 169

For Java >= 1.8

Arrays.stream(array, incIndex, exclusiveIndex)

Upvotes: 2

enator
enator

Reputation: 2599

JDK >= 1.8

I agree with all the answers above. There is also a nice way with Java 8 Streams:

int[] subArr = IntStream.range(startInclusive, endExclusive)
                        .map(i -> src[i])
                        .toArray();

The benefit about this is, it can be useful for many different types of "src" array and helps to improve writing pipeline operations on the stream.

Not particular about this question, but for example, if the source array was double[] and we wanted to take average() of the sub-array:

double avg = IntStream.range(startInclusive, endExclusive)
                    .mapToDouble(index -> src[index])
                    .average()
                    .getAsDouble();

Upvotes: 17

Jigar Joshi
Jigar Joshi

Reputation: 240956

You can use

JDK > 1.5

Arrays.copyOfRange(Object[] src, int from, int to)

Javadoc

JDK <= 1.5

System.arraycopy(Object[] src, int srcStartIndex, Object[] dest, int dstStartIndex, int lengthOfCopiedIndices);

Javadoc

Upvotes: 412

Alessandro Muzzi
Alessandro Muzzi

Reputation: 848

Using Apache ArrayUtils downloadable at this link you can easy use the method 

subarray(boolean[] array, int startIndexInclusive, int endIndexExclusive)

"boolean" is only an example, there are methods for all primitives java types

Upvotes: 8

Gerco Dries
Gerco Dries

Reputation: 6712

Yes, it's called System.arraycopy(Object, int, Object, int, int) .

It's still going to perform a loop somewhere though, unless this can get optimized into something like REP STOSW by the JIT (in which case the loop is inside the CPU).

int[] src = new int[] {1, 2, 3, 4, 5};
int[] dst = new int[3];

System.arraycopy(src, 1, dst, 0, 3); // Copies 2, 3, 4 into dst

Upvotes: 22

Milan Jaros
Milan Jaros

Reputation: 1147

int newArrayLength = 30; 

int[] newArray = new int[newArrayLength];

System.arrayCopy(oldArray, 0, newArray, 0, newArray.length);

Upvotes: 4

Merky
Merky

Reputation: 494

The code is correct so I'm guessing that you are using an older JDK. The javadoc for that method says it has been there since 1.6. At the command line type:

java -version

I'm guessing that you are not running 1.6

Upvotes: 2

AlexR
AlexR

Reputation: 115388

I you are using java prior to version 1.6 use System.arraycopy() instead. Or upgrade your environment.

Upvotes: 1

Bozho
Bozho

Reputation: 597362

Arrays.copyOfRange(..) was added in Java 1.6. So perhaps you don't have the latest version. If it's not possible to upgrade, look at System.arraycopy(..)

Upvotes: 147

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