java printWrite不向文件写入任何内容，但创建文件

Question

i use this to write string to file. I see this file has been created by this code but no content inside.

PrintWriter out = new PrintWriter("/home/paul/Documents/linuxwork/core_java/Welcome/src/output.txt");
out.println("helloworld");

Did I miss anything?

THanks

Answer 1

Possibly your missing close()

PrintWriter out = new PrintWriter("/home/paul/Documents/linuxwork/core_java/Welcome/src/output.txt");
out.println("helloworld");
out.close();//<-- added this

Answer 2

Automatic line flushing is disabled with the constructor you used , so you need to call out.flush() to flush the stream to the file:

PrintWriter out = new PrintWriter("/home/paul/Documents/linuxwork/core_java/Welcome/src/output.txt");
out.println("helloworld");
out.flush();