java.util.Scanner.nextLong()方法實例
java.util.Scanner.nextLong() 方法掃描輸入的下一個標記為一個long。形式nextLong()這種方法的調用與nextLong(radix)調用有完全相同的行為方式,其中的radix是此scanner的默認基數。
聲明
以下是java.util.Scanner.nextLong()方法的聲明
public long nextLong()
參數
-
NA
返回值
此方法返回從輸入信息掃描的long值
異常
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InputMismatchException -- 如果下一個標記不匹配Integer正則表達式,或者是超出範圍
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NoSuchElementException -- 如果輸入被耗儘
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IllegalStateException -- 如果此scanner 已關閉
例子
下麵的示例演示java.util.Scanner.nextLong()方法的用法。
package com.yiibai; import java.util.*; public class ScannerDemo { public static void main(String[] args) { String s = "Hello World! 3 + 3.0 = 6.0 true "; Long l = 13964599874l; s = s + l; // create a new scanner with the specified String Object Scanner scanner = new Scanner(s); // find the next long token and print it // loop for the whole scanner while (scanner.hasNext()) { // if no long is found, print "Not Found:" and the token System.out.println("Not Found :" + scanner.next()); // if the next is a long, print found and the long if (scanner.hasNextLong()) { System.out.println("Found :" + scanner.nextLong()); } } // close the scanner scanner.close(); } }
讓我們來編譯和運行上麵的程序,這將產生以下結果:
Not Found :Hello Not Found :World! Found :3 Not Found :+ Not Found :3.0 Not Found := Not Found :6.0 Not Found :true Found :13964599874