黑马程序员Java教程：PrintWriter-字符打印流

PrintWriter：字符打印流

构造函数参数：

1. 字符串路径

2. File对象

3. 字节输出流

4. 字符输出流

示例2：

1.import java.io.BufferedReader;

2.import java.io.InputStreamReader;

3.import java.io.PrintWriter;

4.import java.io.IOException;

5.

6.public class PrintWriterDemo{

7. public static void main(String[] args) throws IOException {

8. BufferedReader bufr = new BufferedReader(new

InputStreamReader(System.in));

9. PrintWriter out = new PrintWriter(System.out);

10.

11. String line = null;

12. while((line = bufr.readLine()) != null){

13. if("over" .equals(line))

14. break;

15. out.println(line.toUpperCase());

16. out.flush();

17. }

18.

19. out.close();

20. bufr.close();

21. }

22.}

23.

运行结果：

示例3：

1.import java.io.BufferedReader;

2.import java.io.FileWriter;

3.import java.io.InputStreamReader;

4.import java.io.PrintWriter;

5.import java.io.IOException;

6.

7.//写入到out.txt文件中

8.public class PrintWriterDemo{

9. public static void main(String[] args) throws IOException {

10. BufferedReader bufr = new BufferedReader(new

InputStreamReader(System.in));

11. //PrintWriter构造函数的第二个参数设置为true，表示自动刷新

12. PrintWriter out = new PrintWriter(new

FileWriter("out.txt" ),true);

13.

14. String line = null;

15. while((line = bufr.readLine()) != null){

16. if("over" .equals(line))

17. break;

18. out.println(line.toUpperCase());

19. }

20.

21. out.close();

22. bufr.close();

23. }

24.}

25.

运行结果：