控制输入流，从控制台打印到文件中，更改输出的位置

 public static void main(String[] args) throws IOException {PrintStream printStream = System.out;//在默认情况下，PrintStream 输出数据的位置 标准输出，即显示器printStream.print("Tom,hello");/*public void print(String s) {if (s == null) {s = "null";}write(s);}*///因为print底层使用的是write，所以我们可以直接调用write进行打印/输出printStream.write("你好，元宇宙".getBytes());//write是字节流//我们可以修改打印流的位置/设备//1.输出修改成到"e:\\f1.txt"//2."Tom,hello" 就会输出到 "e:\\f1.txt"System.setOut(new PrintStream("E:\\f1.txt"));printStream.print("Tom,hello");System.out.println("打印完毕~");//已经打印到文件中printStream.close();}

便捷方式：

 public static void main(String[] args) throws IOException {PrintStream printStream = new PrintStream("E:\\f1.txt");printStream.println("Tom,hello");printStream.write("你好，元宇宙".getBytes());System.out.println("已经打印到文件中~");printStream.close();}

 public static void main(String[] args) throws IOException {
//        PrintWriter printWriter = new PrintWriter(System.out);PrintWriter printWriter = new PrintWriter(new FileWriter("E:\\f2.txt"));printWriter.print("hi,铜陵你好~");System.out.println("打印完成!");printWriter.close();}

 更改输出的位置~