java 方法 示例

掃描器類的hasNextBoolean()方法 (Scanner Class hasNextBoolean() method)

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

  hasNextBoolean()方法在java.util包中可用。

• hasNextBoolean() method is used to check whether this Scanner's next input can be manipulated as a boolean input or not.

  hasNextBoolean()方法用于檢查此掃描程序的下一個輸入是否可以作為布爾輸入進行操作。

• hasNextBoolean() 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.

  hasNextBoolean()方法是一個非靜態方法，只能由類對象訪問，如果嘗試使用類名訪問該方法，則會收到錯誤消息。

• hasNextBoolean() method may throw an exception at the time of checking boolean value.

  hasNextBoolean()方法在檢查布爾值時可能會引發異常。

  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 boolean hasNextBoolean();

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 boolean, it returns true when this Scanner next token is a valid boolean value otherwise it returns false.

該方法的返回類型為boolean ，當此Scanner next標記為有效布爾值時返回true，否則返回false。

Example:

例：

// Java program to demonstrate the example // of boolean hasNextBoolean() method of Scanner import java.util.*;public class HasNextBooleanOfScanner {public static void main(String[] args) {String str = "Hi, [IncludeHelp] + 10.0 true ";// Instantiates a Scanner object with// the given string strScanner sc = new Scanner(str);// Display strSystem.out.println("sc.nextLine(): " + sc.nextLine());// By using hasNextBoolean() method is// to check whether this Scanner next token// contain valid boolean or notboolean status = sc.hasNextBoolean();System.out.println("sc.hasNextBoolean(): " + sc.hasNextBoolean());// By using close() method is to // close the Scanner objectsc.close();} }

Output

輸出量

sc.nextLine(): Hi, [IncludeHelp] + 10.0 true sc.hasNextBoolean(): false

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

java 方法 示例

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