adaptedrandomchars16.java

java编程思想第四版习题答案

// interfaces/AdaptedRandomChars16.java
// TIJ4 Chapter Interfaces, Exercise 16, page 334
/* Create a class that produces a sequence of chars. Adapt this class so
* that it can be an input to a Scanner object.
*/
/* Solution includes, in same package:
* import java.util.*;
*
* public class RandomChars {
*	private static Random rand = new Random();
*	public char next() {
*		return (char)rand.nextInt(128);
*	}
*	public static void main(String[] args) {
*		RandomChars rc = new RandomChars();
*		for(int i = 0; i < 10; i++)
*			System.out.print(rc.next() + " ");
*	}
* }
*/
import java.nio.*;
import java.util.*;

public class AdaptedRandomChars16
		extends RandomChars
		implements Readable {
	private int count;
	public AdaptedRandomChars16(int count) {
		this.count = count;
	}
	public int read(CharBuffer cb) {
		if(count-- == 0) return -1;
		String result = Character.toString(next()) + " ";
		cb.append(result);
		return result.length();
	}
	public static void main(String[] args) {
		Scanner s = new Scanner(new AdaptedRandomChars16(10));
		while(s.hasNext())
			System.out.println(s.next() + " ");
	}
}