StringWriter在Java中的重要性是什麼？

StringWriter類別是Writer類別的子類，它將字串寫入輸出流。為了寫入字串，該字元流將字串收集到字串緩衝區中，然後建構一個字串。 StringWriter的緩衝區會根據資料自動增長。 StringWriter類別的重要方法有write()、append()、getBuffer()、flush()和close()。 p>

語法

<strong>public class StringWriter extends Writer</strong>

範例

import java.io.*;
public class StringWriterTest {
   public static void main(String args[]) {
      String str = "Welcome to Tutorials Point";
      try {
         StringWriter sw = new StringWriter();
         sw.write(str);
         StringBuffer sb = new StringBuffer();
         sb = sw.getBuffer();
         System.out.println("StringBuffer: "+ sb);
         System.out.println("String written by StringWriter: "+ sw);
         sw.close();
      } catch (IOException ioe) {
         System.out.println(ioe);
      }
   }
}

輸出

StringBuffer: Welcome to Tutorials Point
String written by StringWriter: Welcome to Tutorials Point

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