订购枚举值 [英] Ordering enum values
问题描述
我想知道是否有任何方式为不同的类订购枚举。例如,我有一组固定的化学物质,其他化学物质的反应方式不同,有些弱化了。我基本上想要根据组应该对其进行反应的化学物质(即根据类别)来切换排列顺序。我知道我应该使用可比较,但我不知道该怎么做。如果我不够清楚,请发表评论,我会进一步解释。
谢谢。
public static enum Chem {
H2SO4,2KNO3,H20,NaCl,NO2
};
所以我有一些看起来像这样的东西,我已经知道每种化学品如何反应一些其他化学品。我只是想根据它所反应的化学物质来安排。子。这几乎是我所有的。
实现不同的 I was wondering if there is any way of ordering enum for different classes. If for example, I have a fixed group of chemicals which react in different ways to other chemicals, some strongly, some weakly. I basically want to be able to switch up the order in which they are arranged depending on the chemical the group is supposed to react to(i.e depending on the class.). I do know that I am supposed to use Comparable but I am not sure how to do it. If I am not clear enough, leave a comment and I will explain further. Thanks. So I have something that looks like that and I already know how each chemical would react to some other chemicals. I simply want to arrange the Chems based on the chemical it would be reacting with. That's pretty much all I have. Implement different
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(见http://docs.oracle.com/javase/6/docs/api/java/util/Comparator比较器比较器1 =新的比较器< MyEnum>(){
public int compare(MyEnum e1,MyEnum e2){
//你的魔法发生在这里
if(...)
return -1;
else if(...)
return 1;
return 0;
}
};
//和其他用于比较他们的不同方式
//然后使用其中之一:
MyEnum [] allChemicals = MyEnum.values();
Arrays.sort(allChemicals,comparator1); //这是你如何根据在比较器1中的排序critiera进行排序。
public static enum Chem {
H2SO4, 2KNO3, H20, NaCl, NO2
};
Comparator
's ( see http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html )Comparator comparator1 = new Comparator<MyEnum>() {
public int compare(MyEnum e1, MyEnum e2) {
//your magic happens here
if (...)
return -1;
else if (...)
return 1;
return 0;
}
};
//and others for different ways of comparing them
//Then use one of them:
MyEnum[] allChemicals = MyEnum.values();
Arrays.sort(allChemicals, comparator1); //this is how you sort them according to the sort critiera in comparator1.