Java FilterReader close()方法

java.io.FilterReader.close() 方法关闭该流并释放与之关联的所有系统资源。一旦流被关闭，如再调用read(), ready(), mark(), reset() 或skip() 将抛出IOException。

1 语法

public 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.FilterReader.close()方法的例子
 */
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;

public class Demo {
    public static void main(String[] args) throws Exception {
        FilterReader fr = null;
        Reader r = null;
        int i = 0;
        char c;

        try {
            // create new reader
            r = new StringReader("ABCDEFG");

            // create new filter reader
            fr = new FilterReader(r) {
            };

            // read till the end of the stream
            while((i = fr.read())!=-1) {
                c = (char)i;
                System.out.println(c);
            }

        } catch(IOException e) {
            // if any I/O error occurs
            e.printStackTrace();
        } finally {
            // releases system resources
            if(r!=null)
                r.close();
            if(fr!=null) {
                fr.close();
                System.out.print("Stream is closed");
                System.out.print(" system resources released");
            }
        }
    }
}

输出结果为：

A
B
C
D
E
F
G
Stream is closed system resources released