Given a string value and we have to convert it into a double.

给定一个字符串值，我们必须将其转换为双精度型。

Java conversion from String to Double

Java从String转换为Double

To convert a String to Double, we can use the following methods of Double class (see the syntax given below...)

要将String转换为Double ，我们可以使用Double类的以下方法(请参见下面给出的语法...)

Syntax:

句法：

Double Double.valueOf(String).doubleValue();
OR
Double Double.parseDouble(String);

Java代码将字符串转换为Double (Java code to convert a String to Double)

//Java code to convert String to Double
public class Main {
public static void main(String args[]) {
String str = "12345.87878d";
//variable to store result
double result = 0;
//converting string to double
//method 1
result = Double.valueOf(str).doubleValue();
System.out.println("result (value of str as double) = " + result);
//method 2
result = Double.parseDouble(str);
System.out.println("result (value of str as double) = " + result);
}
}

Output

输出量

result (value of str as double) = 12345.87878
result (value of str as double) = 12345.87878

翻译自: https://www.includehelp.com/java-programs/conversion-from-string-to-double-in-java.aspx