turtle3.java

来自「JAVA编程思想第四版英文原版习题答案. pdf原版的」· Java 代码 · 共 29 行

// strings/Turtle3.java
// TIJ4 Chapter Strings, Exercise 3, page516
// Modify Turtle.java so that it sends all output to System.err.
import java.io.*;
import java.util.*;

public class Turtle3 {
	private String name;
	private Formatter f;
	public Turtle3(String name, Formatter f) {
		this.name = name;
		this.f = f;
	}
	public void move(int x, int y) {
		f.format("%s The Turtle is at (%d,%d)\n", name, x, y);
	}
	public static void main(String[] args) {
		PrintStream outAlias = System.err;
		Turtle3 tommy = new Turtle3("Tommy", new Formatter(System.err));
		Turtle3 terry = new Turtle3("Terry", new Formatter(outAlias));
		tommy.move(0,0);
		terry.move(4,8);
		tommy.move(3,4);
		terry.move(2,5);
		tommy.move(3,3);
		terry.move(3,3);	
	}
}