在读取文件时使用分隔符
我几乎没有使用分隔符的经验，我需要读取一个文本文件，该文件存储多个对象，其数据以逗号（“，”）分隔的单行存储。 然后使用单独的字符串来创建添加到arraylist的新对象。
Amadeus,Drama,160 Mins.,1984,14.83 As Good As It Gets,Drama,139 Mins.,1998,11.3 Batman,Action,126 Mins.,1989,10.15 Billy Elliot,Drama,111 Mins.,2001,10.23 Blade Runner,Science Fiction,117 Mins.,1982,11.98 Shadowlands,Drama,133 Mins.,1993,9.89 Shrek,Animation,93 Mins,2001,15.99 Snatch,Action,103 Mins,2001,20.67 The Lord of the Rings,Fantasy,178 Mins,2001,25.87 我正在使用Scanner读取文件，但是我发现没有找到行错误，整个文件存储在一个字符串中：
Scanner read = new Scanner (new File("datafile.txt")); read.useDelimiter(","); String title, category, runningTime, year, price; while (read.hasNext()) { title = read.nextLine(); category = read.nextLine(); runningTime = read.nextLine(); year = read.nextLine(); price = read.nextLine(); System.out.println(title + " " + category + " " + runningTime + " " + year + " " + price + "\n"); // just for debugging } read.close();
使用read.next（）而不是read.nextLine（）
title = read.next(); category = read.next(); runningTime = read.next(); year = read.next(); price = read.next();
我想你想调用.next() ，它返回一个String而不是.nextLine() 。 您的.nextLine()调用正在移过当前行。
Scanner read = new Scanner (new File("datafile.txt")); read.useDelimiter(","); String title, category, runningTime, year, price; while(read.hasNext()) { title = read.next(); category = read.next(); runningTime = read.next(); year = read.next(); price = read.next(); System.out.println(title + " " + category + " " + runningTime + " " + year + " " + price + "\n"); //just for debugging } read.close();
你应该使用next(); 你在哪里使用nextLine();
看一下教程： http ： //docs.oracle.com/javase/tutorial/essential/io/scanning.html
请注意以下几行：
try { s = new Scanner(new BufferedReader(new FileReader("xanadu.txt"))); while (s.hasNext()) { System.out.println(s.next()); }
您还可以使用String.split（）函数将字符串转换为字符串数组，然后针对您的值迭代每个字符串。
如何将逗号分隔的String转换为ArrayList？ 有关详细信息，请参阅此
一个问题是：
while(read.hasNext()) { title = read.nextLine(); category = read.nextLine(); runningTime = read.nextLine(); hasNext()
如果此扫描器的输入中有另一个标记，则返回true。 不是整行。 你需要使用hasNextLine（）
你正在做nextLine（）三次。 我想你需要做的是，读取线和分割线。