New features in Java 12: How to use the new String API to encode and decode strings

New features in Java 12: How to use the new String API to encode and decode strings

In Java 12, a new String API is introduced to provide a new way to encode and decode strings. More convenient method. These new methods make it easier to handle strings of different encodings, improving the efficiency and flexibility of the development process.

The following takes the encoding and decoding methods in the new String API as an example to introduce how to use them to handle the encoding and decoding of strings.

1. Encoding

The new String API in Java 12 provides several new encoding methods that allow us to encode strings into specified encoding formats.

The sample code is as follows:

import java.nio.charset.StandardCharsets;

public class EncodingExample {
    public static void main(String[] args) {
        String text = "Hello, 世界!";
        
        byte[] encodedBytes1 = text.getBytes(StandardCharsets.UTF_8);
        byte[] encodedBytes2 = text.getBytes(StandardCharsets.ISO_8859_1);
        
        System.out.println("UTF-8编码后的字节数组：" + Arrays.toString(encodedBytes1));
        System.out.println("ISO-8859-1编码后的字节数组：" + Arrays.toString(encodedBytes2));
    }
}

In the above code, we first define a string variable text and initialize it to "Hello, world!". Then, we use the getBytes method to encode the text into a byte array in UTF-8 and ISO-8859-1 format, and print the result.

2. Decoding

In addition to encoding methods, the new String API also provides several decoding methods for decoding byte arrays into strings.

The sample code is as follows:

import java.nio.charset.StandardCharsets;

public class DecodingExample {
    public static void main(String[] args) {
        byte[] encodedBytes = {-27, -91, -67, -26, -97, -128, -28, -72, -83, 44, 32, -27, -101, -67, -28, -67, -96, -27, -91, -67, -26, -83, -96, -23, -105, -82};

        String decodedText1 = new String(encodedBytes, StandardCharsets.UTF_8);
        String decodedText2 = new String(encodedBytes, StandardCharsets.ISO_8859_1);

        System.out.println("UTF-8解码后的字符串：" + decodedText1);
        System.out.println("ISO-8859-1解码后的字符串：" + decodedText2);
    }
}

In the above code, we define a byte array encodedBytes, which contains a byte array of UTF-8 encoded string "world". We then use the String constructor to decode the byte array into a string and print the result.

Through the above two examples, we can see that the encoding and decoding methods in the new String API are very simple and convenient to use. We only need to specify the desired encoding format without manually converting the byte array or handling possible exceptions.

Summary:

The new String API in Java 12 provides a more convenient method for encoding and decoding strings. We can use the new encoding method to encode a string into a specified encoding format, or we can use the new decoding method to decode a byte array into a string. This makes us more flexible and efficient when dealing with strings of different encodings.

Of course, in addition to the encoding and decoding methods introduced in the above examples, the new String API also provides some other useful methods. Interested readers can consult relevant documents for a more detailed understanding and application.

I hope this article will help you understand the new features in Java 12: how to use the new String API to encode and decode strings!

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