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

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:

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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