Java.util.Scanner.nextBigInteger() Java.util.Scanner.nextBigDecimal() Java.util.Scanner.nextBigInteger() 描述 所述java.util.Scanner.nextBigInteger()方法扫描输入作为表单nextBigInteger(此方法的一个BigInteger.An调用的下一个标记)的行为以完全相同的方式调用nextBigInteger(基数),其中基数是此扫描仪的默认基数。 声明 以下是java.util.Scanner.nextBigInteger()方法的声明 public BigInteger nextBigInteger() 参数 NA 返回值 此方法返回从输入中扫描的BigInteger 异常 InputMismatchException - 如果下一个标记与Integer正则表达式不匹配,或者超出范围 NoSuchElementException - 如果输入已用尽 IllegalStateException - 如果此扫描程序已关闭 实例 以下示例显示了java.util.Scanner.nextBigInteger()方法的用法。 package com.tutorialspoint; import java.util.*; public class ScannerDemo { public static void main(String[] args) { String s = "Hello World! 3 + 3.0 = 6 true"; // create a new scanner with the specified String Object Scanner scanner = new Scanner(s); // find the next BigInteger token and print it // loop for the whole scanner while (scanner.hasNext()) { // if the next is BigInteger, print "Found" and the Integer if (scanner.hasNextBigInteger()) { System.out.println("Found :" + scanner.nextBigInteger()); } // if a BigInteger is not found, print "Not Found" and the token System.out.println("Not Found :" + scanner.next()); } // close the scanner scanner.close(); } } 让我们编译并运行上面的程序,这将产生以下结果 Not Found :Hello Not Found :World! Found :3 Not Found :+ Not Found :3.0 Not Found := Found :6 Not Found :true Java.util.Scanner.nextBigDecimal() Java.util.Scanner.nextBigInteger()