所以当再一次创建 Scanner 对象,传入的是一个已经被关闭了的 System.in,它此时已经无法读取输入,所以在尝试读取操作时会抛出异常。 3 解决办法 既然找到了原因:input.close() 使System.in 过早地关闭了,那解决办法自然有了:最后再调用 close()。可以有三种方式: 在需要时随时创建一个 Scanner 对象传入 System.in...
package problem;import java.util.ArrayList;import java.util.Scanner;public class pta1002 {public static void main(String[] args) {int temp;int sum=0;int i;Scanner sc = new Scanner(System.in);ArrayList<String> strList = new <String>ArrayList();...
Scanner problem import java.util.Scanner; public class Program { public static void main(String[] args) { Scanner Inputinfo= new Scanner (System.in); System.out.print("What is your name ??"); String Name=Inputinfo.nextLine (); System.out.print("Your school"); String School1=Inputinfo...
与某些评论者所说的相反，您尝试使用的方法确实存在。有问题的方法需要一个必需的第一个参数，然后是...
https://www.acwing.com/problem/content/570/ 下面的做法是用JAVA scanner依次读入输入数据,但这样做的效率较低,会直接导致TLE: 1importjava.util.Scanner;23publicclassMain {4publicstaticvoidmain(String[] args) {5Scanner in =newScanner(System.in);6intn =in.nextInt();7for(inti = 1; i <= n;...
What Is Scanner in Java? Scanner is a class present in the java.util package. It breaks the input into tokens using a delimiter pattern, which by default is whitespace. These tokens can later be converted into values of different types using the variousnextmethods. ...
The scanner class in Java is used to take input from the user. This article will tell you about the constructors, their types, and methods that you can use from the Scanner class.
Dayve, Tried it but it doesn't work.,same exception again..The problem is that it doesn't ask for the second input 'age' System.out.println("What is your name? "); name = in.nextLine(); System.out.printf("Hello %s,", name); System.out.println("What is your age? "); age ...
JAVA Scanner 类 下面是创建 Scanner 对象的基本语法: Scanners = newScanner(System.in); 通过 Scanner 类的 next() 与 nextLine() 方法获取输入的字符串,在读取前我们一般需要使用hasNext 与 hasNextLine 判断是否还有输入的数据: 1.使用 next 方法: 在main主方法中创建Scanner 对象,然后输出。使用hasNext判断...
java - Scanner Scanner(InputStream source) System类下有一个静态的字段: public static final Inputstream in 标准的输入流,对应着键盘录入 hasNextXx() 判断是否还有下一个输入项, 其中Xx可以是int double等, 如果是字符串,可省略。 类型一致 返回true nextXxx(......