How can Java write streams to an array?

In Java, data can be written to an array using either byte streams or character streams.

1. Write to an array using byte stream.

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static void main(String[] args) throws IOException {
        InputStream input = ...; // 获取输入流

        ByteArrayOutputStream output = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];
        int length;
        while ((length = input.read(buffer)) != -1) {
            output.write(buffer, 0, length);
        }

        byte[] data = output.toByteArray();

        // 使用数据数组进行后续操作

        input.close();
        output.close();
    }
}

1. Write to an array using character streams.

import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.Reader;

public class Main {
    public static void main(String[] args) throws IOException {
        Reader reader = ...; // 获取Reader对象

        CharArrayWriter writer = new CharArrayWriter();

        char[] buffer = new char[1024];
        int length;
        while ((length = reader.read(buffer)) != -1) {
            writer.write(buffer, 0, length);
        }

        char[] data = writer.toCharArray();

        // 使用数据数组进行后续操作

        reader.close();
        writer.close();
    }
}

Please note that in the above examples, you will need to obtain an input stream or a Reader object based on the specific situation. Additionally, remember to close the input stream or Reader object as well as the output stream or Writer object after finishing the operation.