我试图写入txt文件。
但没有丢失已存储在文件中的数据。如何将数据追加到文件?
但我的问题是,当我把字符串放在txt文件中时,新字符串会覆盖旧的字符串,我把它放在之前。
我的代码是:
public void addWorker(Worker worker){
workers.put(worker.getId(), worker);
}
public void printWorker (String id){
Worker work = (Worker) workers.get(id);
if (work == null) {
System.out.println("Worker NOT found");
}
else {
work.printText();
}
}
public void printWorkers() {
if (workers.size() == 0) {
System.out.println("No workres");
return;
}
Collection<Worker> c = workers.values();
Iterator<Worker> itr = c.iterator();
System.out.println("Workers in division "+dName+ ":");
while (itr.hasNext()) {
Worker wo = itr.next();
wo.printText();
}
}
public void writeToFile(){
PrintWriter pw = null;
try{
pw = new PrintWriter(new File("d:\\stam\\stam.txt"));
Collection<Worker> c = workers.values();
Iterator<Worker> itr = c.iterator();
while (itr.hasNext()) {
Worker wo = itr.next();
pw.write("worker: "+wo.getId()+", "+wo.getName()+", "+wo.getAddress()+", "+wo.getSex());
pw.println();
}
}
catch(Exception e) {
System.out.println(e);
}
finally {
if (pw != null) {
pw.close();
}
}
}
}
你能帮助我吗?