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Java 8 – How to convert a String into char[] Arrays ?

July 18, 2022 SJ Java 8, String Handling 0

In this article, we will understand with a Java program on how to convert a String into char[] Arrays in Java 1.8 version

Already in one of the previous article, we discussed how to convert a String into char[] Arrays using earlier versions of Java like 5 or 7, etc.

Convert String into char[] Arrays :

  • toCharArray() method of String
    • Returns equivalent char[] Arrays for the invoking String
    • If invoking string is null, then java.lang.NullPointerException is thrown

ConvertStringToCharArrays.java

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package in.bench.resources.java8.string.methods;
 
import java.util.Arrays;
import java.util.stream.Stream;
 
public class ConvertStringToCharArrays {
 
    public static void main(String[] args) {
 
        // 1. string
        String url = "BenchResourcesNet";
 
 
        // 1.1 convert String into char[] Arrays
        char[] urlArray = Stream.of(url).map(String::toCharArray).findFirst().get();
        System.out.println("Converted Arrays for String (" + url + ") is :- \n"
                + Arrays.toString(urlArray));
 
 
        // 2. Empty string
        String str1 = "";
 
 
        // 2.1 checking string is empty
        char[] array1 = Stream.of(str1).map(String::toCharArray).findFirst().get();
        System.out.println("\nConverted Arrays for empty String (" + str1 + ") is :- \n"
                + Arrays.toString(array1) + "\n\n");
 
 
        // 3. null string
        String str2 = null;
 
 
        // 3.1 checking empty on null string
        char[] array2 = Stream.of(str2).map(String::toCharArray).findFirst().get();
        System.out.println("Converted Arrays for String (" + str2 + ") is :- \n"
                + Arrays.toString(array2));
    }
}

Output:

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Converted Arrays for String (BenchResourcesNet) is :-
[B, e, n, c, h, R, e, s, o, u, r, c, e, s, N, e, t]
 
Converted Arrays for empty String () is :-
[]
 
 
Exception in thread "main" java.lang.NullPointerException
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
    at java.base/java.util.stream.Streams$StreamBuilderImpl.tryAdvance(Streams.java:397)
    at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129)
    at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
    at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:647)
    at in.bench.resources.java8.string.methods.ConvertStringToCharArrays
.main(ConvertStringToCharArrays.java:35)

Related Articles:

References:

Happy Coding !!
Happy Learning !!

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