在 Java 中将字符串转换为双精度
原文:https://www . geesforgeks . org/convert-string-to-double-in-Java/
给定一个字符串，任务是在 Java 中将其转换为 Double。
示例:
Input: String = "20.156"
Output: 20.156
Input: String = "456.21"
Output: 456.21
我们可以使用各种方法来执行任务:
-
Using Double.parseDouble()
语法:
```java double str1 = Double.parseDouble(str);
```
```java // Java program to convert String to Double // using parseDouble()
public class GFG {
// main method public static void main(String args[]) {
// create a String String str = "2033.12244";
// convert into Double double str1 = Double.parseDouble(str);
// print String as Double System.out.println(str1); } } ```
Output:
```java 2033.12244
```
-
Using Double.valueOf()
语法:
```java double str1 = Double.valueOf(str);
```
示例:
```java // Java program to convert String to Double // using parseDouble()
public class GFG {
// main method public static void main(String args[]) {
// create a String String str = "2033.12244";
// convert into Double double str1 = Double.valueOf(str);
// print String as Double System.out.println(str1); } } ```
Output:
```java 2033.12244
```
-
Using constructor of Double class
语法:
```java Double str1 = new Double(str);
```
示例:
```java // Java program to convert String to Double // using parseDouble()
public class GFG {
// main method public static void main(String args[]) {
// create a String String str = "2033.12244";
// convert into Double Double str1 = new Double(str);
// print String as Double System.out.println(str1); } } ```
Output:
```java 2033.12244
```
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