Op Java is een Snaar is een voorwerp dat vertegenwoordigt de reeks karakters. Om Strings te kunnen gebruiken, moeten we de Snaar klasse gedefinieerd in java.lang pakket. De String-array is een reeks van snaren met een vaste lengte. In dit gedeelte zullen we leren Hoe String naar String-array te converteren .
Opmerking: Java-tekenreeksen zijn onveranderlijke objecten, dat wil zeggen dat de tekenreekswaarde niet kan worden gewijzigd nadat deze is gemaakt.
String naar String-array converteren
Er zijn vier manieren om een String naar een String-array in Java te converteren:
lijst maken in Java
- Met behulp van de String.split()-methode
- Met behulp van de Pattern.split()-methode
- String[ ]-aanpak gebruiken
- Met behulp van de toArray()-methode
Met behulp van de String.split()-methode
De Tekenreeks.split() De methode wordt gebruikt om de tekenreeks op te splitsen in afzonderlijke tekenreeksentiteiten op basis van het gegeven scheidingsteken (spatie of andere symbolen). We kunnen deze entiteiten rechtstreeks in een stringarray opslaan.
Laten we het volgende voorbeeld bekijken, waarbij we de methode String.split() gebruiken om een string naar een stringarray te converteren.
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;> Laten we het volgende voorbeeld bekijken waarin we een tekenreeks in een array splitsen door het scheidingsteken als witruimte te gebruiken.
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;> Uitgang:
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Met behulp van de toArray()-methode
We kunnen String ook naar String-array converteren met behulp van de toArray() werkwijze van de Lijst klas. Het neemt een lijst van het type String als invoer en converteert elke entiteit naar een stringarray.
Beschouw het volgende voorbeeld waarin we de lijst met tekenreeksen hebben omgezet in een tekenreeksarray.
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;>