Java.util.Scanner.nextBoolean() Java.util.Scanner.nextBigInteger() Java.util.Scanner.nextByte() 描述 所述java.util.Scanner.nextBoolean()方法扫描输入的下一个标记为一个布尔值,并返回该值。如果下一个标记无法转换为有效的布尔值,则此方法将抛出InputMismatchException。如果匹配成功,扫描仪将超过匹配的输入。 声明 以下是java.util.Scanner.nextBoolean()方法的声明 public boolean nextBoolean() 参数 NA 返回值 此方法返回从输入扫描的布尔值 异常 InputMismatchException - 如果下一个标记不是有效的布尔值 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.nextBoolean()方法的用法。 package com.tutorialspoint; import java.util.*; public class ScannerDemo { public static void main(String[] args) { String s = "Hello true World! 3 + 3.0 = 6 "; // create a new scanner with the specified String Object Scanner scanner = new Scanner(s); // find the next boolean token and print it // loop for the whole scanner while (scanner.hasNext()) { // if the next is boolean, print found and the boolean if (scanner.hasNextBoolean()) { System.out.println("Found :" + scanner.nextBoolean()); } // if a boolean 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 Found :true Not Found :World! Not Found :3 Not Found :+ Not Found :3.0 Not Found := Not Found :6 Java.util.Scanner.nextBigInteger() Java.util.Scanner.nextByte()