Java.io.ByteArrayInputStream.markSupported()方法實例

java.io.ByteArrayInputStream.markSupported() 如果輸入流是否支持mark() 和reset()方法的調用方法返回true。對於ByteArrayInputStream類的方法總是返回true。

聲明

以下是java.io.ByteArrayInputStream.markSupported()方法的聲明：

public boolean markSupported()

參數

• NA

返回值

這種方法對於ByteArrayInputStream類返回true

異常

• NA

例子

下面的示例演示java.io.ByteArrayInputStream.markSupported()方法的用法。

package com.yiibai; import java.io.ByteArrayInputStream; import java.io.IOException; public class ByteArratInputStreamDemo { public static void main(String[] args) throws IOException { byte[] buf = {65, 66, 67, 68, 69}; ByteArrayInputStream bais = null; try{ // create new byte array input stream bais = new ByteArrayInputStream(buf); // test support for mark() and reset() methods invocation boolean isMarkSupported = bais.markSupported(); System.out.println("Is mark supported : "+isMarkSupported); System.out.println("Following is the proof:"); // print bytes System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Mark() invocation"); // mark() invocation; bais.mark(0); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Reset() invocation"); // reset() invocation bais.reset(); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); }catch(Exception e){ // if I/O error occurs e.printStackTrace(); }finally{ if(bais!=null) bais.close(); } } }

讓我們來編譯和運行上面的程序，這將產生以下結果：

Is mark supported : true Following is the proof: Byte read 65 Byte read 66 Byte read 67 Mark() invocation Byte read 68 Byte read 69 Reset() invocation Byte read 68 Byte read 69