20230621 java.io.Writer

介绍

• java.io.Writer
• public abstract class Writer implements Appendable, Closeable, Flushable

API

• write

  • abstract void write(char cbuf[], int off, int len) throws IOException;
    • 唯一的抽象方法
  • void write(int c) throws IOException
    • 写入一个字符（两个字节，一个 char）
  • void write(char cbuf[]) throws IOException
  • void write(String str) throws IOException
  • void write(String str, int off, int len) throws IOException

• append

  • Writer append(char c) throws IOException
  • Writer append(CharSequence csq) throws IOException
  • Writer append(CharSequence csq, int start, int end) throws IOException

• flush

• close

• nullWriter