java 方法 示例

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

Syntax:

句法：

    public boolean hasNextInt();
public boolean hasNextInt(int rad);

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

  hasNextInt()方法在java.util包中可用。

• hasNextInt() method is used to check whether this Scanner has next token in its input can be manipulated as an int in the implicit radix (rad) or not.

  hasNextInt()方法用于檢查此掃描程序在其輸入中是否具有下一個標記是否可以作為隱式基數(rad)中的int進行操作。

• hasNextInt(int rad) method is used to check whether this Scanner has next token in its input can be manipulated as an int in the explicit or given radix (rad) or not.

  hasNextInt(int rad)方法用于檢查此掃描程序在其輸入中是否具有下一個標記，可以將其作為顯式或給定基數(rad)中的int進行操作。

• These methods may throw an exception at the time of representing input as an int.

  在將輸入表示為int時，這些方法可能會引發異常。

  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。

• These are non-static methods, it is accessible with class object & if we try to access these methods with the class name then we will get an error.

  這些是非靜態方法，可通過類對象訪問；如果嘗試使用類名稱訪問這些方法，則會收到錯誤消息。

Parameter(s):

參數：

• In the first case, hasNextInt(),

  在第一種情況下， hasNextInt() ，

  • It does not accept any parameter.

• In the second case, hasNextInt(int rad),

  在第二種情況下， hasNextInt(int rad) ，

  • int rad – represents the radix used to manipulate as an int.
  • int rad –表示用作int的基數。

Return value:

返回值：

In both the cases, the return type of the method is boolean, it returns true when this Scanner next input as an int otherwise it returns false.

在這兩種情況下，方法的返回類型是布爾值 ，當這種掃描儀下一個輸入為一個int否則返回false返回true。

Example:

例：

// Java program is to demonstrate the example
// of hasNextInt() method of Scanner
import java.util.*;
import java.util.regex.*;
public class HasNextInt {
public static void main(String[] args) {
String str = "Java Programming! 3 * 8= 24";
// Instantiates Scanner
Scanner sc = new Scanner(str);
while (sc.hasNext()) {
// By using hasNextInt() method is to
// check whether this object next token
// represents int or not in the default 
// radix
boolean status = sc.hasNextInt();
System.out.println("sc.hasNextInt(): " + status);
// By using hasNextInt(radix) method is to
// check whether this object next token
// represents integer in the given radix
// or not
status = sc.hasNextInt(2);
System.out.println("sc.hasNextInt(2): " + status);
sc.next();
}
// Scanner closed
sc.close();
}
}

Output

輸出量

sc.hasNextInt(): false
sc.hasNextInt(2): false
sc.hasNextInt(): false
sc.hasNextInt(2): false
sc.hasNextInt(): true
sc.hasNextInt(2): false
sc.hasNextInt(): false
sc.hasNextInt(2): false
sc.hasNextInt(): false
sc.hasNextInt(2): false
sc.hasNextInt(): true
sc.hasNextInt(2): false

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

java 方法 示例