java.nio.BufferUnderflowException 同时将字节数组转换为双精度
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java.nio.BufferUnderflowException while converting byte array to double
提问by Sushmita Bhattacharya
I need to convert a bytearray to double. I am using
我需要将字节数组转换为双精度。我在用
double dvalue = ByteBuffer.wrap(value).getDouble();
But at the runtime I am getting BufferUnderflowException exception
但是在运行时我收到 BufferUnderflowException 异常
Exception in thread "main" java.nio.BufferUnderflowException
at java.nio.Buffer.nextGetIndex(Buffer.java:498)
at java.nio.HeapByteBuffer.getDouble(HeapByteBuffer.java:508)
at Myclass.main(Myclass.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
What do I need to change here?
我需要在这里更改什么？
回答by Sotirios Delimanolis
ByteBuffer#getDouble()throws
BufferUnderflowException - If there are fewer than eight bytes remaining in this buffer
So valuemust contain less than 8 bytes. A doubleis a 64 bit, 8 bytes, data type.
所以value必须包含少于8个字节。Adouble是 64 位、8 字节的数据类型。
回答by user3145373 ツ
Your code be something like this :
你的代码是这样的：
byte [] value = { // values };
double dvalue = ByteBuffer.wrap(value).getDouble();
If it is then it should work.
如果是，那么它应该可以工作。
And show us your data of valuearray.
并向我们展示您的value数组数据。
from the oracle docs:
来自 oracle文档：
Throws: BufferUnderflowException - If there are fewer than eight bytes remaining in this buffer
In order to fix it, you need to make sure that the ByteBufferhas enough data in it in order to read a double (8 bytes).
为了修复它，您需要确保其中ByteBuffer有足够的数据以读取 double (8 bytes)。
Look Here's a simple code to show what you want with input data and output.
看看这里有一个简单的代码来显示你想要的输入数据和输出。
