Java StringReader close()方法

java.io.StringReader.close() 方法关闭该流并释放与之关联的所有系统资源。一旦流已关闭，进一步read(), ready(), mark(), reset(), 或 skip() 调用将抛出IOException。

1 语法

public abstract void close()

2 参数

无

3 返回值

无

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.StringReader.close() 方法的例子
 */
import java.io.*;

public class Demo {
    public static void main(String[] args) {
        String s = "Hello World";

        // create a new StringReader
        StringReader sr = new StringReader(s);

        try {
            // read the first five chars
            for (int i = 0; i < 5; i++) {
                char c = (char) sr.read();
                System.out.print("" + c);
            }

            // change the line
            System.out.println();

            // close the stream
            sr.close();

            //try to access the reader after it is closed
            try {
                sr.ready();

            } catch (Exception ex) {
                // catch the exception and print a message if reader is closed
                System.out.println("Reader is closed.");
            }

        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}

输出结果为：

Hello
Reader is closed.