英文:
Why isn't printing if i press enter?
问题
以下是已翻译的代码部分：
import java.io.*;import java.util.*;import java.text.*;import java.math.*;import java.util.regex.*;public class Main {public static void main(String[] args) {Scanner input = new Scanner(System.in);int count = 1;while (input.hasNext()) {String s = input.nextLine();System.out.println(count + " " + s);count++;}input.close();}}
如果您需要进一步的帮助，请告诉我。
英文:
Here is a problem in hackerrank. I am a noob in java so am facing a problem. In the code logic if i press enter means \n nextLine() will get it and will print number 1 but if I press enter it does print 1 but when I input a string it will print all the previous number why?
import java.io.*;import java.util.*;import java.text.*;import java.math.*;import java.util.regex.*;public class Main {public static void main(String[] args) {Scanner input = new Scanner(System.in);int count = 1;while (input.hasNext()) {String s = input.nextLine();System.out.println(count + " " + s);count++;}input.close();}}
My current result is:
(enter)//input//no output(enter)//input//no output(enter)//input//no outputHello World! //input1234 Hello World!//output
But shouldn't it be like
(enter)//input1 //output(enter)//input2 //output(enter)//input3 //outputHello World!//input4 Hello World! //output
答案1
得分: 3
问题在于input.hasNext()不包括空白的新行。你应该将它更改为input.hasNextLine()以产生期望的效果，就像下面的示例中一样：
public class Main {public static void main(String[] args) {Scanner input = new Scanner(System.in);int count = 1;while (input.hasNextLine()) {String s = input.nextLine();System.out.println(count + " " + s);count++;}input.close();}}
英文:
The issue is that input.hasNext() does not include an empty new line. You should change it to input.hasNextLine() to produce the desired effects, such as in the following:
public class Main {public static void main(String[] args) {Scanner input = new Scanner(System.in);int count = 1;while (input.hasNextLine()) {String s = input.nextLine();System.out.println(count + " " + s);count++;}input.close();}}
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