Java Scanner 类——获取用户的输入

import java.util.Scanner;

public class ScanTest1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        if (scanner.hasNext()) {
            String str1 = scanner.next();
            System.out.println("Input:" + str1);
        }
        scanner.close();
    }
}

public class ScanTest2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        if (scanner.hasNextLine()) {
            String str1 = scanner.nextLine();
            System.out.println("Input:" + str1);
        }
        scanner.close();
    }
}

public class ScanTest3 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        if (scanner.hasNextInt()) {
            int str1 = scanner.nextInt();
            System.out.println("Input:" + str1);
        }
        scanner.close();
    }
}