java bufferedread_Java BufferedReader read()方法

Java BufferedReader read()方法

java.io.BufferedReader.read() 用于讀取單個字元。

1 文法

public int read()

2 參數

無

3 傳回值

傳回一個整數字元。如果已到達流的末尾，則該方法傳回-1。

4 示例

package com.yiidian;

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

public class Demo {

public static void main(String[] args) throws Exception {

InputStream is = null;

InputStreamReader isr = null;

BufferedReader br = null;

try {

// open input stream test.txt for reading purpose.

is = new FileInputStream("d:/test.txt");

// create new input stream reader

isr = new InputStreamReader(is);

// create new buffered reader

br = new BufferedReader(isr);

int value = 0;

// reads to the end of the stream

while((value = br.read()) != -1) {

// converts int to character

char c = (char)value;

// prints character

System.out.println(c);

}

} catch(Exception e) {

e.printStackTrace();

} finally {

// releases resources associated with the streams

if(is!=null)

is.close();

if(isr!=null)

isr.close();

if(br!=null)

br.close();

}

}

}

假設test.txt内容如下：

ABCDEF

輸出結果為：

A

B

C

D

E

F