java.util.Scanner中hasNext()方法和next()方法的区别

先说结论：

1. 两者均根据空格划分数据
2. 两者在没有数据输入时均会等待输入
3. next()方法会将空格划分的数据依次输出，运行一次，输出一个
4. hasNext()方法会跟着next()方法移动，当前数据不为空，则返回true

代码：

import java.util.Scanner;

public class MyScanner {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("1. System.out.println(scanner.hasNext());");
        System.out.println(scanner.hasNext());
        System.out.println("2. System.out.println(scanner.hasNext());");
        System.out.println(scanner.hasNext());
        System.out.println("3. System.out.println(scanner.next());");
        System.out.println(scanner.next());
        System.out.println("4. System.out.println(scanner.hasNext());");
        System.out.println(scanner.hasNext());
        System.out.println("5. System.out.println(scanner.next());");
        System.out.println(scanner.next());
        System.out.println("6. System.out.println(scanner.hasNext());");
        System.out.println(scanner.hasNext());
        System.out.println("7. System.out.println(scanner.next());");
        System.out.println(scanner.next());
        System.out.println("8. System.out.println(scanner.hasNext());");
        System.out.println(scanner.hasNext());

    }
}

　　

结果：

流程