Get byte string java

Java String getBytes

getBytes() method in Java is defined as “converting the string into a byte of array”. getBytes() method returns byte[] array. getBytes() method in Java is applied with Strings only. Every string value in a byte array is converted into its equivalent ASCII (American Standard Code for Information Interchange) values. We can say it is an encoded form of the data to protect from unknown actions on the data.

Real-time Application: When we want to convert the string into a byte array, then the getBytes() method comes into the picture.

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How does getBytes() work in Java?

Java getBytes() method works are based on string values in 3 ways:

String str="Some String"; Byte[] byteArray=Str.getBytes();

• public byte[] getBytes(String string) throws UnsupportedEncodingException. The standard supporting Charset in the java application are mentioned below:

• US-ASCII: It is 7-bit ASCII characters.
• ISO-8859-1: It is ISO (Indian Standard Organization) Latin-alphabet.
• UTF-8: It is an 8-bit Universal Coded Character Set format.
• UTF-16BE: This is a 16-bit Universal Coded Character Set format by big-endian order.
• UTF-16LE: This is 16-bit Universal Coded Character Set by little-endian order.
• UTF-16: 16-bit Universal Coded Character Set format.

String str=”UTF-16”; Byte[] byteArray=Str.getBytes();

Note: If the given data is not convertible, then it throws an UnsupportedEncodingException exception.

Byte[] byteArray=Str.getBytes(“ASCII”);

Examples of Java String getBytes

Given below are the examples of Java String getBytes:

Example #1

package com.getbytes; public class GetBytesOfNames < public static void main(String args[]) < String name = "Paramesh"; /// defining a string byte[] nameByteArray = name.getBytes(); // converting string into byte array for (int i = 0; i < nameByteArray.length; i++) " + nameByteArray[i]);// displaying values > > >

Explanation:

• As you can see in the output corresponding character gives its equivalent ASCII code by applying the getBytes() method.

Example #2

package com.getbytes; public class GetBytesOfSpaceValues< public static void main(String args[]) < String name = "This is Amardeep"; /// defining a string byte[] nameByteArray = name.getBytes(); // converting string into byte array for (int i = 0; i < nameByteArray.length; i++) " + nameByteArray[i]);// displaying values > > >

Explanation:

• As you can see in the output corresponding character gives its equivalent ASCII code by applying the getBytes() method.
• Even space also has an ASCII value.

Example #3

public byte[] getBytes(String string)

package com.getbytes; import java.io.UnsupportedEncodingException; public class GetBytesString < public static void main(String args[]) < String name = "Amardeep"; // defining a string byte[] nameByteArray; try < nameByteArray = name.getBytes("UTF-8"); for (int i = 0; i < nameByteArray.length; i++) " + nameByteArray[i]);// displaying values > > catch (UnsupportedEncodingException e) < // TODO Auto-generated catch block e.printStackTrace(); >// converting string into byte array > >

Explanation:

• As you can see in the output corresponding character gives its equivalent UTF-8 code by applying the getBytes() method.

Example #4

public byte[] getBytes(String string)

• As you can see in the output corresponding character gives its equivalent UTF-8 code by applying the getBytes() method.
• UTF-8-byte array again converted into the original string. It concludes original information can’t be lost.

Explanation:

• As you can see in the output corresponding character gives its equivalent ASCII code by applying the getBytes() method.

Example #6

public byte[] getBytes(Charset characterSet)

package com.getbytes; import java.nio.charset.Charset; public class GetBytesOfCharSetAndString < public static void main(String args[]) < String name = "Hello Amardeep"; // defining a string byte[] nameByteArray = name.getBytes(Charset.forName("ASCII")); System.out.println("=========Coverting String into byte[] array========"); for (int i = 0; i < nameByteArray.length; i++) » + nameByteArray[i]);// displaying values > String string=new String(nameByteArray); System.out.println(«=========Coverting String into byte[] array======= alignnone wp-image-312120 size-medium» svg+xml,%3Csvg%20xmlns=’http://www.w3.org/2000/svg’%20viewBox=’0%200%20300%20232’%3E%3C/svg%3E» alt=»(Charset characterSet)» width=»300″ height=»232″ data-lazy-srcset=»https://cdn.educba.com/academy/wp-content/uploads/2020/03/Java-String-GetBytes-6-300×232.jpg 300w, https://cdn.educba.com/academy/wp-content/uploads/2020/03/Java-String-GetBytes-6.jpg 461w» data-lazy-sizes=»(max-width: 300px) 100vw, 300px» data-lazy-src=»https://cdn.educba.com/academy/wp-content/uploads/2020/03/Java-String-GetBytes-6-300×232.jpg»/>

Explanation:

• As you can see in the output corresponding character gives its equivalent ASCII code by applying the getBytes() method.
• ASCII code byte array again converted into the original string. It concludes original information can’t be lost.

Conclusion

String can be converted into its equivalent ASCII code, UTF code, ISO code based on getBytes(), getBytes(String string) and getBytes(Charset characterSet).

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Guide on Java String getBytes​

A quick guide to learn about String getBytes​ method in Java, Example programs on getBytes​() method.

1. Overview:

Encodes the current String into a sequence of bytes using the platform’s default charset , storing the result into a new byte array.

This method has 4 overloaded methods.

public byte[] getBytes() public void getBytes​(int srcBegin, int srcEnd, byte[] dst, int dstBegin) --> This is @Deprecated public byte[] getBytes​(String charsetName) throws UnsupportedEncodingException public byte[] getBytes​(Charset charset)

2. Supported Charset Names:

Every implementation of the Java platform is required to support the following standard charsets. Consult the release documentation for your implementation to see if any other charsets are supported. The behavior of such optional charsets may differ between implementations.

US-ASCII: Seven-bit ASCII, a.k.a. ISO646-US, a.k.a. the Basic Latin block of the Unicode character set ISO-8859-1: ISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1 UTF-8: Eight-bit UCS Transformation Format UTF-16BE: Sixteen-bit UCS Transformation Format, big-endian byte order UTF-16LE: Sixteen-bit UCS Transformation Format, little-endian byte order UTF-16: Sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order mark

3. Examples:

We will learn example programs on all overloaded methods of getBytes .

In all our examples, we will use the String object as below described. All these explained examples getBytes method returns byte array .

3.1 getBytes()

Encodes this String into a sequence of bytes using the platform’s de fault charset , storing the result into a new byte array.

The behavior of this method when this string cannot be encoded in the default charset is unspecified. The CharsetEncoder class should be used when more control over the encoding process is required.

byte[] bytes = string.getBytes();

1195111599104111111108115

Here default charset is used for string encoding.

3.2 getBytes​(String charsetName)

This method as well encodes the string into a sequence of bytes using the provided charsetName and returns the result into a new byte array.

bytes = string.getBytes("UTF-16BE"); // 0119051011509901040111011101080115 bytes = string.getBytes("UTF-16LE"); // 1190510115099010401110111010801150

If the provided charsetName is not in the supported format then will thrown runtime exception saying » java.io.UnsupportedEncodingException «. Always should use a valid charsetName as described in » Supported Charset Names » above section 2.

3.3 getBytes​(Charset charset)

This method as well encodes the string into a sequence of bytes using the provided charset and returns the result into a new byte array.

bytes = string.getBytes(Charset.defaultCharset()); // 11905101150990104011101110108011501195111599104111111108115

This method always replaces malformed-input and unmappable-character sequences with this charset’s default replacement byte array. The CharsetEncoder class should be used when more control over the encoding process is required.

4. Conclusion

In this article, we discussed what is getBytes method in String class with overloaded methods. We further discussed examples on each method.

All code examples can be found at GitHub.

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A quick guide to learn about String getBytes​ method in Java, Example programs on getBytes​() method.

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