Java中的Scanner next方法[复制]

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入数据：");
        if (scanner.hasNext()) {
            String input = scanner.next();
            System.out.println("读取到的数据：" + input);
        } else {
            System.out.println("没有读取到数据");
        }
        scanner.close();
    }
}

import java.util.Scanner;
import java.util.NoSuchElementException;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        try {
            System.out.println("请输入数据：");
            while (scanner.hasNext()) {
                String input = scanner.next();
                System.out.println("读取到的数据：" + input);
            }
        } catch (NoSuchElementException e) {
            System.out.println("已经到达输入末尾");
        } finally {
            scanner.close();
        }
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入数据：");
        if (scanner.hasNext()) {
            String input = scanner.next().trim();
            System.out.println("读取到的数据：" + input);
        } else {
            System.out.println("没有读取到数据");
        }
        scanner.close();
    }
}