9. สร้างใหม่จากเก่า

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รหัสที่ 9-26 เมท็อด equals ของคลาส Complex ที่แทนของคลาส Object

public class Complex {
  private double real, imag;
  ...
  public boolean equals(Object obj) {
    if (!(obj instanceof Complex)) return false;
    Complex z = (Complex) obj;
    return real == z.real && imag == z.imag;
  }