flower.java

来自「Java编程思想第三版,作者书中全部原代码,」· Java 代码 · 共 48 行

//: c04:Flower.java
// Calling constructors with "this."
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import com.bruceeckel.simpletest.*;

public class Flower {
  static Test monitor = new Test();
  int petalCount = 0;
  String s = new String("null");
  Flower(int petals) {
    petalCount = petals;
    System.out.println(
      "Constructor w/ int arg only, petalCount= "
      + petalCount);
  }
  Flower(String ss) {
    System.out.println(
      "Constructor w/ String arg only, s=" + ss);
    s = ss;
  }
  Flower(String s, int petals) {
    this(petals);
//!    this(s); // Can't call two!
    this.s = s; // Another use of "this"
    System.out.println("String & int args");
  }
  Flower() {
    this("hi", 47);
    System.out.println("default constructor (no args)");
  }
  void print() {
//! this(11); // Not inside non-constructor!
    System.out.println(
      "petalCount = " + petalCount + " s = "+ s);
  }
  public static void main(String[] args) {
    Flower x = new Flower();
    x.print();
    monitor.expect(new String[] {
      "Constructor w/ int arg only, petalCount= 47",
      "String & int args",
      "default constructor (no args)",
      "petalCount = 47 s = hi"
    });
  }
} ///:~