CharArrayWriter append(CharSequence csq, int start, int end) CharArrayWriter append(CharSequence csq) void close 描述 所述java.io.CharArrayWriter.append(CharSequence的CSQ,INT开始,INT端)方法将指定字符序列的这种写入器的部分。 声明 以下是java.io.CharArrayWriter.append(CharSequence csq,int start,int end)方法的声明 public CharArrayWriter append(CharSequence csq, int start, int end) 参数 csq - 要追加的字符序列。如果字符序列为null,则编写器附加4个字符“null”。 start - 部分中第一个字符的索引 end - 子序列结束后的字符索引 返回值 This CharArrayWriter 异常 IndexOutOfBoundsException - 如果end大于序列的长度,则start大于end,或start或end为negative。 实例 以下示例显示了java.io.CharArrayWriter.append(CharSequence csq,int start,int end)方法的用法。 package com.tutorialspoint; import java.io.CharArrayWriter; public class CharArrayWriterDemo { public static void main(String[] args) { CharArrayWriter chw = null; try { // create character array writer chw = new CharArrayWriter(); // declare character sequence CharSequence csq = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // append character sequence to the writer chw.append(csq, 2, 5); // prints out the character sequences System.out.println(chw.toString()); } catch(Exception e) { // for any error e.printStackTrace(); } finally { // releases all system resources from writer if(chw!=null) chw.close(); } } } 让我们编译并运行上面的程序,这将产生以下结果 CDE CharArrayWriter append(CharSequence csq) void close