Data commit

Task/Remove-lines-from-a-file/Java/remove-lines-from-a-file.java

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+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+
+public class RemoveLines
+{
+	public static void main(String[] args)
+	{
+		//Enter name of the file here
+		String filename="foobar.txt";
+		//Enter starting line here
+		int startline=1;
+		//Enter number of lines here.
+		int numlines=2;
+		
+		RemoveLines now=new RemoveLines();
+		now.delete(filename,startline,numlines);
+	}
+	void delete(String filename, int startline, int numlines)
+	{
+		try
+		{
+			BufferedReader br=new BufferedReader(new FileReader(filename));
+			
+			//String buffer to store contents of the file
+			StringBuffer sb=new StringBuffer("");
+			
+			//Keep track of the line number
+			int linenumber=1;
+			String line;
+			
+			while((line=br.readLine())!=null)
+			{
+				//Store each valid line in the string buffer
+				if(linenumber<startline||linenumber>=startline+numlines)
+					sb.append(line+"\n");
+				linenumber++;
+			}
+			if(startline+numlines>linenumber)
+				System.out.println("End of file reached.");
+			br.close();
+			
+			FileWriter fw=new FileWriter(new File(filename));
+			//Write entire string buffer into the file
+			fw.write(sb.toString());
+			fw.close();
+		}
+		catch (Exception e)
+		{
+			System.out.println("Something went horribly wrong: "+e.getMessage());
+		}
+	}
+}