public?class?phone1?{
	int?size?=?1;

	@Override
	public?int?hashCode()?{
		final?int?prime?=?31;
		int?result?=?1;
		result?=?prime?*?result?+?size;
		return?result;
	}

	@Override
	public?boolean?equals(Object?obj)?{
		if?(this?==?obj)
			return?true;
		if?(obj?==?null)
			return?false;
		if?(getClass()?!=?obj.getClass())
			return?false;
		phone1?other?=?(phone1)?obj;
		if?(size?!=?other.size)
			return?false;
		return?true;
	}

}

public?class?phone2?{
	int?size?=?1;
}

public?class?PHONE?{
	public?static?void?main(String[]?args)?{
		//?TODO?Auto-generated?method?stub
		phone1?p1?=?new?phone1();
		phone2?p2?=?new?phone2();

		if(p1.equals(p2))
		{
			System.out.println("兩個(gè)電腦的參數(shù)相同！");
		}
		else
		{
			System.out.println("兩個(gè)電腦的參數(shù)不同！");
		}
	}
}

結(jié)果是 ?兩個(gè)電腦的參數(shù)不同！