Java 将 double 写入文件
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write double into a file
提问by lonesome
How can I convert a double into a const char, and then convert it back into a double? I want to convert the double to a string, to write it to a file and then when I read the file, it needed to be converted back into a double
如何将双精度转换为常量字符，然后将其转换回双精度？我想将双精度转换为字符串，将其写入文件，然后当我读取文件时，需要将其转换回双精度
采纳答案by John3136
Double.toString()
双.toString()
Double.parseDouble(String s)
Double.parseDouble(String s)
回答by javaCity
You can directly invoke the "write" method to a double. For instance:
您可以直接调用 double 的“write”方法。例如：
double testDouble = 2.0;
bufferedOut.write(testDouble);
Then when reading the file as a string you can do the following to convert back to double:
然后在将文件作为字符串读取时，您可以执行以下操作以转换回双精度：
String line = //<what you read from file>;
double gotDouble = Double.parseDouble(line);
回答by PBL
double x = 3.14159; Any basic datatype can easily be converted to String by concatenating them with a String even if it is "" String value = "" + x; Most datatype Object counterpart have a parseXXX() method to translate a String into that datatype double y = Double.parseDouble(value);
双 x = 3.14159; 任何基本数据类型都可以通过将它们与字符串连接来轻松转换为字符串，即使它是 "" String value = "" + x; 大多数数据类型对象都有一个 parseXXX() 方法将字符串转换为该数据类型 double y = Double.parseDouble(value);
回答by kundan bora
Making Double as constant
使 Double 作为常量
public final Double DOUBLE = 20D;
making double as String -
使双倍作为字符串 -
String.valueOf(DOUBLE);
