This is my code:
public class FileReplace {
List<String> lines = new ArrayList<String>();
String line = null;
public void doIt() {
try {
File f1 = new File("d:/new folder/t1.htm");
FileReader fr = new FileReader(f1);
BufferedReader br = new BufferedReader(fr);
while ((line = br.readLine()) != null) {
if (line.contains("java"))
line = line.replace("java", " ");
lines.add(line);
}
fr.close();
br.close();
FileWriter fw = new FileWriter(f1);
BufferedWriter out = new BufferedWriter(fw);
for(String s : lines)
out.write(s);
out.flush();
out.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void main(String args[]) {
FileReplace fr = new FileReplace();
fr.doIt();
}
}
and I have this text:
javascript_js
java_swing
java_fx
kotlin
python
I wanna edit java_fx
to java
. My code is deleting all content and write java_fx
, how do I edit java_fx
without erasing all content in file?
FileWriter fw = new FileWriter(f1, true);
向FileWriter构造函数添加true参数,这将避免重写内容。
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