方法一

 

PrintWriter pr = new PrintWriter("abc.txt");
pr.println("ddd");
pr.println("ddd");
pr.println("ddd");
pr.println("ddd");
pr.close();

 

 

方法二

BufferedWriter bw = new BufferedWriter(new FileWriter("abc.txt",true)); 
bw.write("tttuu");
bw.close();