inoutdemo.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter13;
import java.io.*;                   
import java.lang.*;
public class InOutDemo
{
	public static void main(String args[])
	{
		int    count;
		byte   input[] = new byte[256];
		//键盘读入
      	DataInputStream datin = new DataInputStream(System.in);         
		BufferedInputStream bufin = new BufferedInputStream(datin);
		//屏幕输出
      	DataOutputStream datout = new DataOutputStream(System.out); 
		BufferedOutputStream bufout = new BufferedOutputStream(datout);
		PrintStream prt = new PrintStream(System.out);  //屏幕输出
      try
		{
			//测试是否支持流标记和重置
         if(bufin.markSupported( ))   
         {
			System.out.println("支持流标记?--是"); 
			prt.print("输入字符串,按<Enter>结束:\n" ); //使用PrintStarem输出   
			bufin.mark(256);  //标记出可读的最大字节数
			count = bufin.read(input);  //读取位，并写入数组
			prt.println("读入字符数: " +count);  
			prt.print("您输入的字符串为: ");
			bufout.write(input,0,count);  //写入位串流           
			bufout.flush();  //强制输出
            bufin.reset();
            bufin.read(input,0,count/2);
            prt.print("字符串的前半段: ");
            bufout.write(input,0,count/2);
            bufout.write((int)('\n'));
            bufout.flush();
            bufin.reset();
            bufin.skip(count/2);
            bufin.read(input,0,count/2);
            prt.print("字符串的后半段: ");
            bufout.write(input,0,count/2);
            bufout.flush();
         }
         else
         {
            System.out.println("支持流标记?--否");
         }
         prt.close();
         datin.close();
         bufin.close(); 
         datout.close();
         bufout.close();
      }
      catch(IOException E)
      { 
         System.out.println("发生I/O错误!!!");
      }
   }
}