Java FilterReader read()方法

java.io.FilterReader.mark(int readAheadLimit) 方法读取单个字符，并返回一个介于0到65535之间的整数。

1 语法

public int read()

2 参数

无

3 返回值

此方法返回读取的字符，范围为​​0到65535之间的整数，如果到达流的末尾，则返回-1。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.FilterReader.mark(int readAheadLimit)方法的例子
 */
import java.io.FilterReader;
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("ABCDEF");

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

            // read till the end of the stream
            while((i = fr.read())!=-1) {

                // converts integer to character
                c = (char)i;

                // print
                System.out.println("Character read: "+c);
            }

        } catch(Exception e) {
            // if any I/O error occurs
            e.printStackTrace();
        } finally {
            // releases system resources associated with this stream
            if(r!=null)
                r.close();
            if(fr!=null)
                fr.close();
        }
    }
}

输出结果为：

Character read: A
Character read: B
Character read: C
Character read: D
Character read: E
Character read: F