The `java.io.DataInput.readDouble` method is a part of the Java I/O system that reads and returns a double value from an input source. This method is typically used to read double values that were previously written to an output stream using the `writeDouble` method. It reads the next eight bytes from the input source and interprets them as a 64-bit IEEE 754 floating-point value, converting it to a double value. The method throws an IOException if an error occurs while reading the data.
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