java scanner

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

Syntax:

句法：

public long nextLong();public long nextLong(int rad);

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

  nextLong()方法在java.util包中可用。

• nextLong() method is used to read the next token of the input as a long value at the implicit radix of this Scanner.

  nextLong()方法用于讀取輸入的下一個(gè)令牌，作為此Scanner的隱含基數(shù)處的長(zhǎng)值。

• nextLong(int rad) method is used to read the next token of the input as a long value at the explicit or given radix(rad) of this Scanner.

  nextLong(int rad)方法用于在此Scanner的顯式或給定基數(shù)(rad)處讀取輸入的下一個(gè)標(biāo)記作為長(zhǎng)值。

• These methods may throw an exception at the time of representing an input as a long value.

  在將輸入表示為長(zhǎng)值時(shí)，這些方法可能會(huì)引發(fā)異常。

  • InputMismatchException: This exception may throw when the next token of the input mismatch.InputMismatchException ：當(dāng)輸入的下一個(gè)標(biāo)記不匹配時(shí)，可能引發(fā)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(fā)此異常。
  • IllegalStateException: This exception may throw when this Scanner is not opened.IllegalStateException ：如果未打開(kāi)此掃描器，則可能引發(fā)此異常。

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

  這些是非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)這些方法，則會(huì)收到錯(cuò)誤消息。

Parameter(s):

參數(shù)：

• In the first case, nextLong(),

  在第一種情況下， nextLong() ，

  • It does not accept any parameter.

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

  在第二種情況下， nextLong(int rad) ，

  • int rad – represents the radix used to manipulate the token as a long value.
  • int rad –表示用于操縱令牌的基數(shù)為長(zhǎng)值。

Return value:

返回值：

In both the cases, the return type of the method is long, it retrieves the long value read from the input.

在這兩種情況下，方法的返回類型都是long ，它檢索從輸入讀取的long值。

Example 1:

范例1：

// Java program to demonstrate the example // of nextLong() method of Scannerimport java.util.*; import java.util.regex.*;public class NextLong {public static void main(String[] args) {String str = "Java Programming! 3 * 8= 24 + b";long l = 101245l;// Instantiates ScannerScanner sc = new Scanner(str);while (sc.hasNext()) {// By using nextLong() method isto// return the next token as a // long at the implicit radixif (sc.hasNextLong()) {long next_l = sc.nextLong();System.out.println("sc.nextLong()): " + next_l);}System.out.println(sc.next());}// Scanner closedsc.close();} }

Output

輸出量

Java Programming! sc.nextLong()): 3 * 8= sc.nextLong()): 24 + b

Example 2:

范例2：

import java.util.*; import java.util.regex.*;public class NextLong {public static void main(String[] args) {String str = "Java Programming! 3 * 8= 24 + b";long l = 101245l;// Instantiates ScannerScanner sc = new Scanner(str);while (sc.hasNext()) {// By using nextLong(9) method isto// return the next token as a // long at the explicit radixif (sc.hasNextLong()) {long next_l = sc.nextLong(9);System.out.println("sc.nextLong(9)): " + next_l);}System.out.println(sc.next());}// Scanner closedsc.close();} }

Output

輸出量

Java Programming! sc.nextLong(9)): 3 * 8= sc.nextLong(9)): 22 + b

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

java scanner

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