java scanner

掃描儀類的nextDouble()方法 (Scanner Class nextDouble() method)

• nextDouble() method is available in java.util package.

  nextDouble()方法在java.util包中可用。

• nextDouble() method is used to scans the next token of the input scanned into a double value.

  nextDouble()方法用于將輸入的下一個標記掃描為雙精度值。

• nextDouble() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  nextDouble()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• nextDouble() method may throw an exception at the time of returning a double value.

  返回雙精度值時， nextDouble()方法可能會引發異常。

  • InputMismatchException: This exception may throw when the next token input mismatch.InputMismatchException ：下一個令牌輸入不匹配時，可能引發此異常。
  • NoSuchElementException: This exception may throw when no such element exists.NoSuchElementException ：如果不存在這樣的元素，則可能引發此異常。
  • IllegalStateException: This exception may throw when this Scanner is not opened.IllegalStateException ：如果未打開此掃描器，則可能引發此異常。

Syntax:

句法：

public double nextDouble();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is double, it returns double value for the input.

方法的返回類型為double ，它為輸入返回double值。

Example:

例：

// Java program to demonstrate the example // of double nextDouble() method of Scanner import java.util.*;public class NextDoubleOfScanner {public static void main(String[] args) {String str = "Hi, Includehelp! 8 + 2.0 = 10.0 true";// Instantiate Scanner with the // given strScanner sc = new Scanner(str);// Loop for scanning the double// token inputwhile (sc.hasNext()) {// if double then display itif (sc.hasNextDouble()) {System.out.println("Double Exists: " + sc.nextDouble());}sc.next();}// close the scannersc.close();} }

Output

輸出量

Double Exists: 8.0 Double Exists: 2.0 Double Exists: 10.0

翻譯自: https://www.includehelp.com/java/scanner-nextdouble-method-with-example.aspx

java scanner

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