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

java.io.CharArrayReader.markSupported() 如果方法測試數據流支持mark()。 char數組讀取器支持 mark()方法。

聲明

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

public boolean markSupported()

參數

• NA

返回值

如果流支持mark()調用該方法返回true。

異常

• NA

例子

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

package com.yiibai; import java.io.CharArrayReader; import java.io.IOException; public class CharArrayReaderDemo { public static void main(String[] args) { CharArrayReader car = null; char[] ch = {'A', 'B', 'C', 'D', 'E'}; try{ // create new character array reader car = new CharArrayReader(ch); // verifies if the stream support mark() method boolean bool = car.markSupported(); System.out.println("Is mark supported : "+bool); System.out.println("Proof:"); // read and print the characters from the stream System.out.println(car.read()); System.out.println(car.read()); // mark() is invoked at this position car.mark(0); System.out.println("Mark() is invoked"); System.out.println(car.read()); System.out.println(car.read()); // reset() is invoked at this position car.reset(); System.out.println("Reset() is invoked"); System.out.println(car.read()); System.out.println(car.read()); System.out.println(car.read()); }catch(IOException e){ // if I/O error occurs e.printStackTrace(); }finally{ // releases any system resources associated with the stream if(car!=null) car.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 Proof: 65 66 Mark() is invoked 67 68 Reset() is invoked 67 68 69