Apa metode Java System.arraycopy()?
Java System.arraycopy() metode Pranyatan
Deklarasi metode kanggo metode java.lang.System.arraycopy() ing kelas java.lang kaya ing ngisor iki:
public static void arraycopy(Object src, int srcIndex, Object dest, int destIndex, int len)
Paramèter
Ing ngisor iki paramèter saka metode arraycopy :-
src : Iku array sumber.
-
srcIndex : Iku indeks wiwitan saka array sumber.
-
dest : Iku array tujuan.
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destIndex : Iki minangka indeks wiwitan saka array tujuan.
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len : Iki minangka jumlah unsur sing kudu disalin saka array sumber menyang array tujuan.
Fungsionalitas
Cara arraycopy nyalin data saka src , wiwit saka srcIndex nganti srcIndex +( len - 1) unsur, menyang dest array ing destIndex nganti destIndex + ( len - 1).Nilai bali
Cara arraycopy nduweni jinis bali sing ora sah sing tegese ora ngasilake apa-apa.Tuladha
public class Example {
public static void main(String[] args) {
String[] src = { "Monday","Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
String[] dest = { "January", "February", "March", "April", "May", "June", "July", "August"};
int srcIndex = 2;
int destIndex = 3;
int len = 2;
//print number of elements that need to be copied
//from the source to the destination array
System.out.println("len : " + len);
//print source index
System.out.println("srcIndex : " + srcIndex);
//print elements of the source array
System.out.print("src : ");
for (int i = 0; i < src.length; i++)
System.out.print(src[i] + " ");
System.out.println("");
//print destination index
System.out.println("destIndex : " + destIndex);
//print elements of the destination array
System.out.print("dest : ");
for (int i = 0; i < dest.length; i++)
System.out.print(dest[i] + " ");
System.out.println("");
// Use of arraycopy() method
System.arraycopy(src, srcIndex, dest, destIndex, len);
// this method copies the 'len' no of elements
// from the src array to the dest array using the srcIndex
// and destIndex as reference points in both the arrays
// Print elements of destination after
System.out.print("final destination array : ");
for (int i = 0; i < dest.length; i++)
System.out.print(dest[i] + " ");
}
}
Output
len : 2 srcIndex : 2 src : Senin Selasa Rebo Kemis Jum'at Setu Minggu DestIndex : 3 Dest : Januari Februari Maret April Mei Juni Juli Agustus Agustus susunan tujuan akhir : Januari Februari Maret Rebo Kemis Juni Juli Agustus
Conto ngganti paramèter
// Example of changing parameters
srcIndex = 4;
destIndex = 5;
len = 1;
Output
len : 1 srcIndex : 4 src : Senin Selasa Rebo Kemis Jum'at Setu Minggu DestIndex : 5 Dest : Januari Februari Maret April Mei Juni Juli Agustus Agustus susunan tujuan akhir : Januari Februari Maret April Mei Jum'at Juli Agustus
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