pushbackinputstreamdemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter10;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.PushbackInputStream;

public class PushbackInputStreamDemo {

	public static void main(String[] args) throws IOException {
		String s = "if (X == 4) X = 0;\n";
		byte buf[] = s.getBytes();
		ByteArrayInputStream bytearray = new ByteArrayInputStream(buf);
		PushbackInputStream push_back = new PushbackInputStream(bytearray);
		int c;
		while ((c = push_back.read()) != -1) {
			switch (c) {
			case '=':
				if ((c = push_back.read()) == '=')
					System.out.print(" equals to ");
				else {
					System.out.print("<-");
					push_back.unread(c);
				}
				break;
			default:
				System.out.print((char) c);
				break;
			}
		}
	}
}