如何使用java打印起始行號碼

在這段代碼中，我試圖打印起始行號碼。在這裏我正在讀取文本文件中的值並將這些值相加。但我正在嘗試從它開始計數的位置獲取行號..如何使用java打印起始行號碼

我該怎麼做？

代碼

import java.io.*; 

class CountR 
{ 
    public static void main(String args[]) 
    { 
     setForSum("read.txt",7); 
    } 

    public static void setForSum(String filename,int param2) 
    { 
     try 
     { 
      FileInputStream fstream = new FileInputStream(filename); 
      BufferedReader br = new BufferedReader(new InputStreamReader(fstream)); 
      String strLine; 
      int i = 0; 
      int sum=0; 
      int startline=0; 
      System.out.println(param2+": Is in"); 
      while ((strLine = br.readLine()) != null) 
      { 
       ++i; 
       startline = i; 
       int line = Integer.parseInt(strLine); 
       sum=sum+line; 
       System.out.println("Sum= "+sum); 
       if(sum>=param2) 
       {     
        /* System.out.println("line number : "+i);*/ 
        System.out.println("Start line number :"+startline+" End line number:" +i); 
        sum =0; 
       }         
      }    
      in.close(); 
     } 
     catch (Exception e) 
     { 
      System.err.println("Error: " + e.getMessage()); 
     } 
    } 
}

read.txt文件

我現在得到的輸出是這樣的。

Sum= 1 
Sum= 3 
Sum= 6 
Sum= 10 
Start line number :4 End line number:4 
Sum= 1 
Sum= 3 
Sum= 6 
Sum= 7 
Start line number :8 End line number:8 
Sum= 2 
Sum= 5 
Sum= 6 
Sum= 8 
Start line number :12 End line number:12 
Sum= 3 
Sum= 4 
Sum= 6 
Sum= 9 
Start line number :16 End line number:16 
Sum= 1 
Sum= 3 
Sum= 6 
Sum= 7 
Start line number :20 End line number:20 
Sum= 2 
Sum= 5 
Sum= 6 
Sum= 8 
Start line number :24 End line number:24 
Sum= 3

但應

Sum= 1 
    Sum= 3 
    Sum= 6 
    Sum= 10 
    Start line number :1 End line number:4 
    Sum= 1 
    Sum= 3 
    Sum= 6 
    Sum= 7 
    Start line number :5 End line number:8 
    Sum= 2 
    Sum= 5 
    Sum= 6 
    Sum= 8 
    Start line number :9 End line number:12 
    Sum= 3 
    Sum= 4 
    Sum= 6 
    Sum= 9 
    Start line number :13 End line number:16 
    Sum= 1 
    Sum= 3 
    Sum= 6 
    Sum= 7 
    Start line number :17 End line number:20 
    Sum= 2 
    Sum= 5 
    Sum= 6 
    Sum= 8 
    Start line number :21 End line number:24 
    Sum= 3

來源

2013-07-17 Mithun Raikar

你意識到'java.io.LineNumberReader'類？ – EJP

你是不是重置startline任何地方。使用以下：1

int startline = 1;

 while ((strLine = br.readLine()) != null) 
     { 
      ++i; 
      if(startline == 0) // set startline only if startline is zero, which will happen the first time and everytime you've printed the status 
       startline = i; 
      int line = Integer.parseInt(strLine); 
      sum=sum+line; 
      System.out.println("Sum= "+sum); 
      if(sum>=param2) 
      {     
       /* System.out.println("line number : "+i);*/ 
       System.out.println("Start line number :"+startline+" End line number:" +i); 
       sum =0; 
       startline = 0; // reset startline here 
      }         
     }

來源

2013-07-17 10:09:30 zEro

初始化和印刷後重設：

if(sum>=param2) 
{     
    /* System.out.println("line number : "+i);*/ 
    System.out.println("Start line number :"+startline+" End line number:" +i); 
    sum =0; 
    startline = i+1; 
}

（當然，去掉startline=i你現在有）

來源

2013-07-17 10:09:43

如何使用java打印起始行號碼

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