Java

Question

当我运行下面的代码在一个do-while循环中（略）；它同时打印两行询问歌曲名称和大小。但是，在询问文件大小之前，它从不收集名称的字符串输入。

我需要它在询问文件大小（未发生）之前收集名称的字符串。

这是怎么回事？

            //Interface.java
            import java.util.*;
            ...
            Scanner console = new Scanner(System.in); //After importing Scanner.
            ...

            option = console.nextInt(); // User chooses an option (add / delete song, etc.) by pressing a number. Only adding is relevant here.

            do { // Code inside a do-while loop which repeats for entering name / file size on 4 songs.
            song = console.nextInt(); // User chooses to add name / file size to either song1, song2, song3 or song 4 (there is a maximum of 4 song objects).

            System.out.println("Please enter the name of a song.");
            name = console.nextLine();

            System.out.println("Please enter file size in MB.");
            do { // This do-while checks input to be an integer / not negative & then it assigns the input as...
            fileSize = console.nextInt();
            // end of do-while loop which checks the integer.

            // end of do-while loop which lets user add name / size to a maximum of 4 songs.

Answer 1

始终在 console.nextInt(); 之后执行 console.nextLine(); 以消耗换行符，它应该可以正常工作。看这里： Scanner is skipping nextLine() after using next(), nextInt() or other nextFoo() methods 原因是 nextInt() 没有消耗换行符（'\n'），所以那里有一个空行等待被消耗。

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loops

input

java.util.scanner