Java Scanner nextBoolean()方法

java.util.Scanner.nextBoolean() 方法扫描输入的下一个标记成一个布尔值并返回该值。此方法将抛出InputMismatchException如果下一个标记不能转换为有效的布尔值。如果匹配成功，则scanner执行匹配的输入。

1 语法

public boolean nextBoolean()

2 参数

无

3 返回值

此方法返回从输入信息扫描的布尔值。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.util.Scanner.nextBoolean()方法的例子
 */
import java.util.*;

public class Demo {
    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();
    }
}

输出结果为：

Not Found :Hello
Found :true
Not Found :World!
Not Found :3
Not Found :+
Not Found :3.0
Not Found :=
Not Found :6