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Java 8 – How to get a specific character from String ?

July 18, 2022 SJ Java 8, String Handling 0

In this article, we will discuss and learn how to get a specific character from String in Java 1.8 version

Already in one of the previous article, we discussed how to get a character from a String using earlier versions of Java like 5 or 7, etc.

Get a specific character from String:

  • charAt(index) method of String
    • Retrieves a character at the specified index-position from the String
    • If specified index-position is within the range i.e., 0 <= index <= (str.length -1) then it retrieves a character
    • Otherwise, java.lang.StringIndexOutOfBoundsException is thrown for out-of-index character

GetACharacterFromString.java

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package in.bench.resources.java8.string.methods;
 
import java.util.stream.Stream;
 
public class GetACharacterFromString {
 
    public static void main(String[] args) {
 
        // string
        String str = "BenchResources.Net";
 
 
        // 1. get character at 5th index-position
        char ch1 = Stream.of(str).map(s -> s.charAt(5)).findFirst().get();
        System.out.println("char at 5th index-position is = " + ch1);
 
 
        // 2. get character at 15th index-position
        char ch2 = Stream.of(str).map(s -> s.charAt(15)).findFirst().get();
        System.out.println("char at 15th index-position is = " + ch2 + "\n\n");
 
 
        // 3. exception - out of index
        char chEx = Stream.of(str).map(s -> s.charAt(18)).findFirst().get();
        System.out.println("char at 18th index-position is = " + chEx);
    }
}

Output:

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char at 5th index-position is = R
char at 15th index-position is = N
 
 
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 18
    at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
    at java.base/java.lang.String.charAt(String.java:1512)
    at in.bench.resources.java8.string.methods.GetACharacterFromString
.lambda$2(GetACharacterFromString.java:24)
    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.GetACharacterFromString
.main(GetACharacterFromString.java:24)

Related Articles:

References:

Happy Coding !!
Happy Learning !!

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