逐行读取输入 [英] Read input line by line

问题描述

如何在Java中逐行读取输入？我搜索过，到目前为止我有这个：

How do I read input line by line in Java? I searched and so far I have this:

import java.util.Scanner;

public class MatrixReader {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        while (input.hasNext()) {
            System.out.print(input.nextLine());
        }
    }

这个问题是它没有读取最后一行。所以如果我输入

The problem with this is that it doesn't read the last line. So if I input

 10 5 4 20
 11 6 55 3
 9 33 27 16

其输出仅为

10 5 4 20 11 6 55 3

推荐答案

理想情况下，您应该添加最终的println（），因为默认情况下，System.out使用仅在发送换行符时刷新的PrintStream。请参阅何时/为何调用System.out.flush（） Java

Ideally you should add a final println() because by default System.out uses a PrintStream that only flushes when a newline is sent. See When/why to call System.out.flush() in Java

while (input.hasNext()) {
    System.out.print(input.nextLine());
}
System.out.println();

虽然您的问题可能还有其他原因。

Although there are possible other reasons for your issue.

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