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Task/Globally-replace-text-in-several-files/Java/globally-replace-text-in-several-files.java

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+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+
+public class GlobalReplace
+{
+	public static void main(String[] args)
+	{
+		//Enter names of the files here
+		String[] filename={"foobar0.txt","foobar1.txt","foobar2.txt","foobar3.txt","foobar4.txt"};
+		//Enter text to replace here
+		String from="Goodbye London!";
+		//Enter replacing text here
+		String to="Hello New York!";
+		
+		GlobalReplace now=new GlobalReplace();
+		for(int i=0;i<filename.length;i++)
+			now.delete(filename[i],from,to);
+	}
+	void delete(String filename, String from, String to)
+	{
+		try
+		{
+			BufferedReader br=new BufferedReader(new FileReader(filename));
+			
+			//String buffer to store contents of the file
+			StringBuffer sb=new StringBuffer("");
+			
+			String line;
+			
+			while((line=br.readLine())!=null)
+			{
+				//If from appears, replace it
+				if(line.contains(from))
+					sb.append(line.replace(from, to)+"\n");
+				else
+					sb.append(line+"\n");
+				
+			}
+			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());
+		}
+	}
+}