java.io.LineNumberInputStream.getLineNumber() 方法返回当前行号。

声明

以下是java.io.LineNumberInputStream.getLineNumber()方法的声明：

public int getLineNumber()

参数

• NA

返回值

该方法返回当前行号。

异常

• NA

例子

下面的示例演示java.io.LineNumberInputStream.getLineNumber()方法的用法。

package com.yiibai;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.LineNumberInputStream;

public class LineNumberInputStreamDemo {
   public static void main(String[] args) throws IOException {
      
      LineNumberInputStream lnis = null;
      FileInputStream fis =null;
      int i,j;
      char c;
      
      try{
         // create new input streams
         fis = new FileInputStream("C:/test.txt");
         lnis = new LineNumberInputStream(fis);
         
         // reads till the end of the stream
         while((i=lnis.read())!=-1)
         {
            // converts int to char
            c=(char)i;
            
            // if the character is not new line 
            if(i!=10)
            {
               // prints char
               System.out.print("Character read: "+c);
               
               // get the line number
               j=lnis.getLineNumber();
               System.out.println(" at line: "+j);
            }
         }
      }catch(Exception e){
         
         // if any error occurs
         e.printStackTrace();
      }finally{
         
         // closes the stream and releases any system resources
         if(fis!=null)
            fis.close();
         if(lnis!=null)
            lnis.close();      
      }
   }
}

假设我们有一个文本文件c:/ test.txt，它具有以下内容。该文件将被用作输入到我们的示例程序：

ABCDE

让我们编译和运行上面的程序，这将产生以下结果：

Character read: A at line: 0
Character read: B at line: 0
Character read: C at line: 0
Character read: D at line: 0
Character read: E at line: 0
Character read: F at line: 1
Character read: G at line: 1
Character read: H at line: 1
Character read: I at line: 1
Character read: J at line: 1
Character read: K at line: 2
Character read: L at line: 2
Character read: M at line: 2
Character read: N at line: 2
Character read: O at line: 2
Character read: P at line: 3
Character read: Q at line: 3
Character read: R at line: 3
Character read: S at line: 3
Character read: T at line: 3