turtle.java

来自「think in java 最新版本的源码」· Java 代码 · 共 36 行

//: strings/Turtle.java
import java.io.*;
import java.util.*;

public class Turtle {
  private String name;
  private Formatter f;
  public Turtle(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.out;
    Turtle tommy = new Turtle("Tommy",
      new Formatter(System.out));
    Turtle terry = new Turtle("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);
  }
} /* Output:
Tommy The Turtle is at (0,0)
Terry The Turtle is at (4,8)
Tommy The Turtle is at (3,4)
Terry The Turtle is at (2,5)
Tommy The Turtle is at (3,3)
Terry The Turtle is at (3,3)
*///:~