/**
* 测试字符输出流PrintWriter
*/
public class TestPrintWriter {
public static void main(String[] args) {
try (BufferedReader br = new BufferedReader(new File Reader(“iostream/testFile5.txt”));
PrintWriter pw = new PrintWriter(“iostream/testFile6.txt”)){
//PrintWriter为节点流，在实例化pw时生成了BufferedWriter(OutputStreamWriter(FileOutputStream(String fileName)))对象，实际依然使用了字节流转字符流
for (String line = br.readLine();line!=null;line = br.readLine()){
pw.println(line);
//使用PrintWriter拷贝字符串，.println()方法类似System.out.println，对每一行内容输出之后不需要手动newLine换行
}
pw.flush();
//PrintWriter作为节点流时需要手动flush
}catch ( Exception e){
e.printStackTrace();
}
try(BufferedReader br = new BufferedReader(new FileReader(“iostream/testFile6.txt”));
PrintWriter pw = new PrintWriter(new FileOutputStream(“iostream/testFile7.txt”),true)){
//PrintWriter作为处理流使用，将 FileOutputStream 对象传入构造器，实例化pw时会外套BufferedWriter(OutputStreamWriter，将参数autoFlush设为true，每次println会自动flush
for (String line = br.readLine();line!=null;line = br.readLine()){
pw.println(line);
}
//无需flush，PrintWriter没有缓冲，需要实例Buffered使用，如果构造器直接传入Writer： new PrintWriter(new FileWriter(“xxx”))这种情况不会外套BufferedWriter
}catch (Exception e){
e.printStackTrace();
}
}
}
