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(gè)輸入是否可以作為布爾輸入進(jìn)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(gè)非靜態(tài)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(shí)可能會引發(fā)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(fā)此異常。

Syntax:

句法：

public boolean hasNextBoolean();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

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(dāng)此Scanner next標(biāo)記為有效布爾值時(shí)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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