使用StringReader和StringWriter操作字符串

来源：互联网发布：java bit operation 编辑：程序博客网时间：2024/05/17 22:46

编程举例：写一函数把StringReader中输入流中的字符串全部转换成大写，然后将结果写到一个StringWriter中，然后使用这一函数将以字符串全部转成大写。

package cn.itcast.stringstream;  import java.io.IOException;  import java.io.StringReader;  import java.io.StringWriter;  public class StringStreamTest {      public static void main(String[] args) {          String str = "abcdefghijklmn";          transform(str);      }      public static void transform(String str) {          StringReader sr = new StringReader(str);          StringWriter sw = new StringWriter();          char[] chars = new char[1024];          try {              int len = 0;              while ((len = sr.read(chars)) != -1) {                  String strRead = new String(chars, 0, len).toUpperCase();                  System.out.println(strRead);                  sw.write(strRead);                  sw.flush();              }              sr.close();              sw.close();          } catch (IOException e) {              e.printStackTrace();          } finally {              sr.close();              try {                  sw.close();              } catch (IOException e) {                  e.printStackTrace();              }          }      }  }

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