În Java, a Şir este o obiect care reprezintă succesiunea de caractere. Pentru a folosi Strings, trebuie să importam fișierul Şir clasa definita in java.lang pachet. The Matrice de șiruri este o matrice de şiruri cu lungime fixă. În această secțiune, vom învăța cum se transformă String în matrice String .
Notă: șirurile Java sunt obiecte imuabile, adică valoarea șirului nu poate fi modificată odată ce a fost creată.
Conversia String în matrice String
Există patru moduri de a converti un String în matrice String în Java:
algoritm de sortare heap
- Folosind metoda String.split().
- Folosind metoda Pattern.split().
- Folosind Abordarea String[ ]
- Folosind metoda toArray().
Folosind metoda String.split().
The String.split() metoda este folosită pentru a împărți șirul în entități șiruri individuale pe baza delimitatorului dat (spații albe sau alte simboluri). Putem stoca aceste entități direct într-o matrice de șiruri.
Să luăm în considerare următorul exemplu în care folosim metoda String.split() pentru a converti un șir într-o matrice de șiruri.
TestSplitMethod.java
public class TestSplitMethod { public static void main(String[] args) { //declaring and initializing a string String str = 'Converting string to string array using split() method'; //declaring an empty string array String[] strArray = null; //converting using String.split() method with whitespace as a delimiter strArray = str.split(' '); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java.webp" alt="How to convert String to String array in Java"> <p> <strong>Example 2:</strong> </p> <p>In the following example, we have converted the string to a string array based on the delimiter that is a <strong>,</strong> (comma).</p> <p> <strong>TestSplitMethod2.java</strong> </p> <pre> public class TestSplitMethod2 { public static void main(String[] args) { String commaSeparatedStr = 'Hello,have,a,nice,day'; String[] strArray = null; //empty string array //converting using String.split() method with comma as a delimiter strArray = commaSeparatedStr.split(','); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-2.webp" alt="How to convert String to String array in Java"> <h3>Using Pattern.split() Method</h3> <p>The Pattern.split() method is used to split the string into an array of strings with the help of regular expression (pattern) as the delimiter.</p> <p>In order to use the method, we need to import the <strong>Pattern</strong> class in our Java code as:</p> <pre> import java.util.regex.Pattern; </pre> <p>Let's consider the following example where we split a string into an array by using the delimiter as whitespace.</p> <p> <strong>SplitMethodOfPatternClass.java</strong> </p> <pre> //importing Pattern class import java.util.regex.Pattern; public class SplitMethodOfPatternClass { public static void main(String[] args) { //declaring and initializing a string String str = 'Converting string to string array using Pattern.split()'; //declaring an empty string array String[] strArray = null; //parsing white space as a parameter Pattern ptr = Pattern.compile(' '); //storing the string elements in array after splitting strArray = ptr.split(str); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-3.webp" alt="How to convert String to String array in Java"> <p> <strong>Example 2:</strong> </p> <p>We can also split a string into an array by using any string or pattern as a delimiter. Here, we have used the delimiter <strong>#a1.</strong> </p> <p> <strong>SplitMethodOfPatternClass2.java</strong> </p> <pre> //importing Pattern class import java.util.regex.Pattern; public class SplitMethodOfPatternClass2 { public static void main(String[] args) { //declaring and initializing a string with a separator String str = 'Hello #a1Ben #a1how #a1are #a1you ?'; //declaring an empty string array String[] strArray = null; //splitting the string with delimiter as #a1 String patternStr = '#a1'; Pattern ptr = Pattern.compile(patternStr); //storing the string elements in array after splitting strArray = ptr.split(str); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-4.webp" alt="How to convert String to String array in Java"> <p>The above example splits the single string into five separate strings based on the delimiter #a1. The parts of the string that matched the delimiter are not included in the array.</p> <h3>Using String[ ] Approach</h3> <p>We can simply convert string to string array by using the string index [ ]. Here, we pass the string to <strong>String [ ] {}.</strong> </p> <p>Consider the following example where we have used the String[] to convert a string into a string array.</p> <p> <strong>StrToStrArray.java</strong> </p> <pre> import java.util.Arrays; public class StrToStrArray { public static void main(String[] args) { //declaring and initializing a string String str = 'Converting string to string array using String[]'; //passing the string to String[] {} String[] strArray = new String[] {str}; //printing the string array using Arrays.toString() System.out.println(Arrays.toString(strArray)); } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-5.webp" alt="How to convert String to String array in Java"> <h3>Using toArray() Method</h3> <p>We can also convert String to String array by using the <a href="/java-list-toarray-method">toArray()</a> method of the <a href="/java-list">List</a> class. It takes a list of type String as the input and converts each entity into a string array.</p> <p>Consider the following example where we have converted the list of strings into a string array.</p> <p> <strong>StringListtoArray.java</strong> </p> <pre> //importing ArrayList and List class import java.util.ArrayList; import java.util.List; public class StringListtoArray { public static void main(String[] args) { //creating a list of type string List list = new ArrayList (); //adding elements to list list.add('Hello'); list.add('Welcome'); list.add('To'); list.add('Tutorial'); //size of list int list_size = list.size(); //creating string array String[] strArray = new String[list_size]; //converting to string array list.toArray(strArray); //printing the string array for(int i = 0; i <strarray.length; i++) { system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-6.webp" alt="How to convert String to String array in Java"> <hr></strarray.length;></pre></strarray.length;></pre></strarray.length;></pre></strarray.length;></pre></strarray.length;>
Să luăm în considerare următorul exemplu în care împărțim un șir într-o matrice folosind delimitatorul ca spațiu alb.
SplitMethodOfPatternClass.java
//importing Pattern class import java.util.regex.Pattern; public class SplitMethodOfPatternClass { public static void main(String[] args) { //declaring and initializing a string String str = 'Converting string to string array using Pattern.split()'; //declaring an empty string array String[] strArray = null; //parsing white space as a parameter Pattern ptr = Pattern.compile(' '); //storing the string elements in array after splitting strArray = ptr.split(str); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-3.webp" alt="How to convert String to String array in Java"> <p> <strong>Example 2:</strong> </p> <p>We can also split a string into an array by using any string or pattern as a delimiter. Here, we have used the delimiter <strong>#a1.</strong> </p> <p> <strong>SplitMethodOfPatternClass2.java</strong> </p> <pre> //importing Pattern class import java.util.regex.Pattern; public class SplitMethodOfPatternClass2 { public static void main(String[] args) { //declaring and initializing a string with a separator String str = 'Hello #a1Ben #a1how #a1are #a1you ?'; //declaring an empty string array String[] strArray = null; //splitting the string with delimiter as #a1 String patternStr = '#a1'; Pattern ptr = Pattern.compile(patternStr); //storing the string elements in array after splitting strArray = ptr.split(str); //printing the converted string array for (int i = 0; i<strarray.length; i++){ system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-4.webp" alt="How to convert String to String array in Java"> <p>The above example splits the single string into five separate strings based on the delimiter #a1. The parts of the string that matched the delimiter are not included in the array.</p> <h3>Using String[ ] Approach</h3> <p>We can simply convert string to string array by using the string index [ ]. Here, we pass the string to <strong>String [ ] {}.</strong> </p> <p>Consider the following example where we have used the String[] to convert a string into a string array.</p> <p> <strong>StrToStrArray.java</strong> </p> <pre> import java.util.Arrays; public class StrToStrArray { public static void main(String[] args) { //declaring and initializing a string String str = 'Converting string to string array using String[]'; //passing the string to String[] {} String[] strArray = new String[] {str}; //printing the string array using Arrays.toString() System.out.println(Arrays.toString(strArray)); } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-5.webp" alt="How to convert String to String array in Java"> <h3>Using toArray() Method</h3> <p>We can also convert String to String array by using the <a href="/java-list-toarray-method">toArray()</a> method of the <a href="/java-list">List</a> class. It takes a list of type String as the input and converts each entity into a string array.</p> <p>Consider the following example where we have converted the list of strings into a string array.</p> <p> <strong>StringListtoArray.java</strong> </p> <pre> //importing ArrayList and List class import java.util.ArrayList; import java.util.List; public class StringListtoArray { public static void main(String[] args) { //creating a list of type string List list = new ArrayList (); //adding elements to list list.add('Hello'); list.add('Welcome'); list.add('To'); list.add('Tutorial'); //size of list int list_size = list.size(); //creating string array String[] strArray = new String[list_size]; //converting to string array list.toArray(strArray); //printing the string array for(int i = 0; i <strarray.length; i++) { system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-6.webp" alt="How to convert String to String array in Java"> <hr></strarray.length;></pre></strarray.length;></pre></strarray.length;>
Ieșire:
Folosind metoda toArray().
De asemenea, putem converti String în matrice String folosind toArray() metoda de Listă clasă. Ia o listă de tip String ca intrare și convertește fiecare entitate într-o matrice de șiruri.
numărul armstrong
Luați în considerare următorul exemplu în care am convertit lista de șiruri într-o matrice de șiruri.
StringListtoArray.java
//importing ArrayList and List class import java.util.ArrayList; import java.util.List; public class StringListtoArray { public static void main(String[] args) { //creating a list of type string List list = new ArrayList (); //adding elements to list list.add('Hello'); list.add('Welcome'); list.add('To'); list.add('Tutorial'); //size of list int list_size = list.size(); //creating string array String[] strArray = new String[list_size]; //converting to string array list.toArray(strArray); //printing the string array for(int i = 0; i <strarray.length; i++) { system.out.println(strarray[i]); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/java-tutorial/38/how-convert-string-string-array-java-6.webp" alt="How to convert String to String array in Java"> <hr></strarray.length;>