Given that data.txt and alldata.txt are accessible, and the code fragment:
```java
public void writeFiles() throws IOException {
BufferedReader br = new BufferedReader(new FileReader("data.txt"));
BufferedWriter bw = new BufferedWriter(new FileWriter("alldata.txt"));
String line = null;
while ((line = br.readLine()) != null) {
// line n1
}
}
```
What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?

Question

Given that data.txt and alldata.txt are accessible, and the code fragment:
```java
public void writeFiles() throws IOException {
 BufferedReader br = new BufferedReader(new FileReader("data.txt"));
 BufferedWriter bw = new BufferedWriter(new FileWriter("alldata.txt"));
 String line = null;
 while ((line = br.readLine()) != null) {
 // line n1
 }
}
```
What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?

Accepted Answer

D. bw.append(line + "
");

Answer

A. br.close();

Answer

B. bw.writeln();

Answer

C. bw.flush();

Given that data.txt and alldata.txt are accessible, and the code fragment: ``java public void writeFiles() throws IOException { BufferedReader br = new BufferedReader(new FileReader("data.txt"))…

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