例子
以下示例显示java.io.FilterInputStream.mark(int readlimit)方法的用法。
package com.jc2182;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
public class FilterInputStreamDemo {
public static void main(String[] args) throws Exception {
InputStream is = null;
FilterInputStream fis = null;
try {
// create input streams
is = new FileInputStream("C://test.txt");
fis = new BufferedInputStream(is);
// reads and prints BufferedReader
System.out.println((char)fis.read());
System.out.println((char)fis.read());
// mark invoked at this position
fis.mark(0);
System.out.println("mark() invoked");
System.out.println((char)fis.read());
System.out.println((char)fis.read());
// reset() repositioned the stream to the mark
fis.reset();
System.out.println("reset() invoked");
System.out.println((char)fis.read());
System.out.println((char)fis.read());
} catch(IOException e) {
e.printStackTrace();
} finally {
// releases any system resources associated with the stream
if(is!=null)
is.close();
if(fis!=null)
fis.close();
}
}
}
假设我们有一个文本文件c:/test.txt ,其内容如下。该文件将用作示例程序的输入-
让我们编译并运行以上程序,这将产生以下结果-
A
B
mark() invoked
C
D
reset() invoked
C
D