Java 检查双值的等于和不等于条件
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check Equal and Not Equal conditons for double values
提问by Siva
I am facing difficulty in comparing two double valuesusing ==and !=.
我在比较两个double values使用==and时遇到困难!=。
I have created 6 double variables and trying to compare in Ifcondition.
我创建了 6 个双变量并尝试比较If条件。
double a,b,c,d,e,f;
if((a==b||c==d||e==f))
{
//My code here in case of true condition
}
else if ((a!=b||c!=d||e!=f))
{
//My code here in case false condition
}
Though my condition is a and b are equalcontrol is going to else ifpart
虽然我的情况是a and b are equal控制将要else if分开
So I have tried a.equals(b)for equal condition, Which is working fine for me.
所以我尝试a.equals(b)了同等条件，这对我来说很好。
My query here is how can I check a not equal b. I have searched the web but I found only to use !=but somehow this is not working for me.
我的查询是如何检查a not equal b. 我在网上搜索过，但我发现只能使用，!=但不知何故这对我不起作用。
采纳答案by Elliott Frisch
If you're using a double(the primitive type) then aand bmust not be equal.
如果您使用的是double（原始类型），则aandb不能相等。
double a = 1.0;
double b = 1.0;
System.out.println(a == b);
If .equals()works you're probably using the object wrapper type Double. Also, the equivalent of !=with .equals()is
如果.equals()可行，您可能正在使用对象包装器类型Double。此外，!=与 with的等价物.equals()是
!a.equals(b)
Edit
编辑
Also,
还，
else if ((a!=b||c!=d||e!=f))
{
//My code here in case false condition
}
(Unless I'm missing something) should just be
（除非我错过了什么）应该只是
else
{
//My code here in case false condition
}
if you really want invert your test conditions andtest again,
如果你真的想反转你的测试条件并再次测试，
else if (!(a==b||c==d||e==f))
Or use De Morgan's Laws
或使用德摩根定律
else if (a != b && c != d && e != f)
回答by Deepanshu J bedi
You can use
您可以使用
!a.equals(b) || !c.equals(d) || !e.equals(f)
Well with double data type you can use
您可以使用双数据类型
==,!= (you should try to use these first.. )
