Java CharArrayWriter append()方法

java.io.CharArrayWriter.append(CharSequence csq, int start, int end) 用于将指定字符的子序列附加到Writer。

1 语法

public CharArrayWriter append(CharSequence csq, int start, int end)

2 参数

csq：要追加的字符序列。如果字符序列为空，则在CharArrayWriter后面附加4个字符“Null”。

start：第一个字符的索引

end：结尾后的字符索引

3 返回值

返回CharArrayWriter。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.CharArrayWriter.append(CharSequence csq, int start, int end)方法的例子
 */
import java.io.CharArrayWriter;

public class Demo {
    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();
        }
    }
}

输出结果为：

CDE