我的代码正常工作,它不是很漂亮,但它的工作就是:)现在我想编写一段代码,如果文本文件中有19个或更多数据,就会阻止加载数据然后显示一条消息,说明无效输入。我不知道如何做到这一点,所以任何帮助都会受到赞赏。
package stackandqueue;
import java.util.*;
import java.util.Stack;
import java.util.Queue;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedList;
import java.util.StringTokenizer;
import java.util.Arrays;
public class StackAndQueue {
public static void main(String[] args) throws IOException {
// Create three empty stacks of Bays.
// Bay 1 linked list
Queue<String> bayoneStack = new LinkedList<String>();
// Bay 2 linkd list.
Queue<String> baytwoStack = new LinkedList<String>();
// Bay 3 linked list
Queue<String> baythreeStack = new LinkedList<String>();
Queue<String> bayloadStack = new LinkedList<String>();
System.out.println("***********************************************");
// Open and read text file
String inputFileName = "PodData4.txt";
FileReader fileReader = new FileReader("PodData4.txt");
// Create the FileReader object
try (BufferedReader br = new BufferedReader(fileReader);) {
// Sort the data into the relevant linked list by type F, T or P.
String[] strings = br.readLine().split(",");
for (String str : strings) {
switch (str.charAt(0)) {
case 'F':
bayoneStack.add(str);
break;
case 'T':
baytwoStack.add(str);
break;
case 'P':
baythreeStack.add(str);
break;
default:
// In-case of invalid input
}
System.out.println(str);
}
} catch (IOException ex) {
// handle exception;
} finally {
fileReader.close();
}
// Prints out the linked list stacks showing all Bays.
System.out.println("***********************************************");
System.out.println("Bay 1:Food: " + bayoneStack.toString());
System.out.println("Bay 2:Technical: " + baytwoStack.toString());
System.out.println("Bay 3:Personal: " + baythreeStack.toString());
}
}
答案 0 :(得分:0)
首先使用条件语句检查总长度。像
这样的东西String test = br.readLine();
if (test.length() < 19) {
String[] strings = test.split(",");
//continue operations with string input
}
else {
//change this to what you want the error to read.
System.out.println("Invalid input.");
}
请注意,我更改了您的strings
数组以拆分test
字符串而不是br.readLine()