U ovom odjeljku ćemo raspravljati koja je najveća veličina niza u Javi.

U Java , a Niz može se smatrati nizom znakova, a niz znakova nazvati nizom. Klasa String predstavlja niz znakova. Ne možemo promijeniti niz nakon što je kreiran. String objekti se ne mogu dijeliti jer jesu nepromjenjiv . Na primjer, razmotrite sljedeći niz:

hiba bukhari

 String str='javatpoint'; 

Gornji niz je ekvivalentan sljedećem:

 char ch[] = {'j', 'a', 'v', 'a', 't', 'p', 'o', 'i', 'n', 't'}; String str = new String(ch); 

Klasa String pruža metodu length() koja određuje duljinu Stringa. Sintaksa metode je sljedeća:

 public int length() 

Metoda vraća duljinu niza. The duljina niza jednak je broju Unicode jedinice u nizu. Java platforma koristi UTF-16 reprezentaciju u nizovima znakova (svaki znak ima dva bajta), klasama String i StringBuffer. U ovom prikazu, dopunski znakovi predstavljeni su kao par vrijednosti znakova, prvi iz raspona visokih surogata (uD800-uDBFF), drugi iz raspona niskih surogata (uDC00-uDFFF).

Metoda vraća duljinu koja je tipa int. Dakle, maksimalna veličina niza jednaka je rasponu tipa podataka cijelog broja. Maksimalna duljina koju bi vratila metoda bila bi Integer.MAX_VALUE.

Veličina int u Javi je 4 bajta (uključujući bit s predznakom, tj. MSB). Raspon tipa podataka cijelog broja je -2³¹do 2³¹-1 (-2147483648 do 2147483647). Zapamtite da ne možemo koristiti negativne vrijednosti za indeksiranje. Indeksiranje se vrši unutar maksimalnog raspona. To znači da ne možemo pohraniti 2147483648^th lik. Stoga je maksimalna duljina Stringa u Javi 0 do 2147483647 . Dakle, možemo imati String duljine 2,147,483,647 znakova, teoretski.

Pronađimo maksimalnu duljinu niza pomoću Java programa.

StringMaxSize.java

.04 kao razlomak

 import java.util.Arrays; public class StringMaxSize { public static void main(String args[]) { for (int i = 0; i <1000; i++) { try integer.max_value is a constant that stores the maximum possible value for any integer variable char[] array="new" char[integer.max_value - i]; assign specified data to each element arrays.fill(array, 'a'); creating constructor of string class and parses an into it str="new" string(array); determines print length system.out.println(str.length()); } catch (throwable e) returns detail message this throwable system.out.println(e.getmessage()); prints system.out.println('last: ' + (integer.max_value i)); i); < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/05/java-string-max-size.webp" alt="Java String Max Size"> <h4>Note: We have not shown the complete output because the output is too long to show.</h4> <p>In the above example, we have used a for loop that executes 1000 times. Inside the try block, we have created an array of <strong>Integer.MAX_VALUE-i</strong> . After that, we have invoked the fill() method of the Arrays class. It assigns the specified data type value to each element of the specified range of the specified array.</p> <p>Inside the catch block, we caught the exception (if any) thrown by the fill() method and the <strong>getMessage()</strong> method prints the message related to the exception.</p> <p>Each character takes two bytes because Java stores string as UTF-16 codes.</p> <p>Whether you are appending strings directly or using a StringBuilder (much better), you will occasionally need twice as much memory: one to store the existing string and one to store the new string/buffer when it needs to be expanded.</p> <p>If we try to insert the value beyond the limit upon doing so, the memory gets overflow and the value that we get will be negative. For example, consider the following program:</p> <p> <strong>StringSizeBeyondLimit.java</strong> </p> <pre> public class StringSizeBeyondLimit { public static void main(String[] arg) { try { System.out.println( &apos;Trying to initialize&apos; + &apos; a n with value&apos; + &apos; Integer.MAX_VALUE + 1&apos;); // Try to store value Integer.MAX_VALUE + 1 int n = Integer.MAX_VALUE + 1; // Print the value of N System.out.println(&apos;n = &apos; + n); } catch(Exception e) { System.out.println(e); } } } </pre> <p> <strong>Output:</strong> </p> <pre> Trying to initialize n with value Integer.MAX_VALUE + 1 n = -2147483648 </pre> <hr></1000;>

Izlaz:

 Trying to initialize n with value Integer.MAX_VALUE + 1 n = -2147483648