从java文件中读取数字

Question

对于其他帖子，我很抱歉这里是我的代码：它的工作原理是打印文本文件，但我不知道如何将第一行与其他文件分开。我的意思是我想将第一行的值保存到2个变量中，然后处理剩下的行。

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.IOException; 


public class read { 
    public static void main (String[] args) throws IOException 
    { 
     String scan; 
     FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt"); 
     BufferedReader br = new BufferedReader(file); 

     while((scan = br.readLine()) != null) 
       { 
      System.out.println(scan); 
       } 
     br.close(); 
    } 
} 

Answer 1

只读第一行分隔，然后遍历文件的其余部分。 编辑： 您可以将字符串分割成一个数组，并阅读你的整数是这样的：

String scan; 
FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt"); 
BufferedReader br = new BufferedReader(file); 
String first = br.readLine(); 
if (null != first) { 
    System.out.println("First is: " + first); 
    String[] numberStrings = first.split(" "); 
    int[] numbers = new int[numberStrings.length]; 
    for (int i = 0; i < numbers.length; i++) { 
     numbers[i] = Integer.parseInt(numberStrings[i]); 
     System.out.println("Number " + i + " is " + numbers[i]); 
    } 
    while((scan = br.readLine()) != null) { 
     System.out.println(scan); 
    } 
} 
br.close(); 

Answer 2

试试这个

  public static void main(String[] args) throws IOException { 
      String scan; 
      FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt"); 
      BufferedReader br = new BufferedReader(file); 
      boolean isFirstLine = true; 
      int forstNo = 0; 
      while ((scan = br.readLine()) != null) { 
       if(isFirstLine){ 
        forstNo = Integer.parseInt(scan); 
        isFirstLine = false; 
       } 

       System.out.println(scan); 
      } 
      br.close(); 
      System.out.println("first no "+forstNo); 
     }