java 将类中的所有静态变量放入数组/列表
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getting all static variables in a class into array/list
提问by Chandra
Bit of a wierd requirement.
有点奇怪的要求。
public class DummyClass{
public static final DummyClass var1;
public static final DummyClass var2;
public static final DummyClass var3;
.
.
.
public static final DummyClass var100;
}
Now from outside of this class can we pool this var's into a single array or list, so that I can iterate over them? Like if i do something like
现在从这个类的外部，我们可以将这个 var 合并到一个数组或列表中，以便我可以迭代它们吗？就像如果我做类似的事情
List<DummyClass> dummyList = *some op*; //I want value of some op.
I should be able to access var1...var100
我应该能够访问 var1...var100
回答by Cameron Skinner
You could use reflection:
你可以使用反射：
Field[] fields = DummyClass.class.getDeclaredFields();
for (Field f : fields) {
if (Modifier.isStatic(f.getModifiers()) && isRightName(f.getName())) {
doWhatever(f);
}
}
回答by walkeros
If you have a class with constants and want to get the actual values of your java constant you can do following:
如果您有一个带有常量的类并想要获取 Java 常量的实际值，您可以执行以下操作：
List<String> constantValues = Arrays.stream(DummyClass.class.getDeclaredFields())
.filter(field -> Modifier.isStatic(field.getModifiers()))
.map(field -> {
try {
return (String) field.get(DummyClass.class);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
})
.filter(name -> ! name.equals("NOT_NEEDED_CONSTANT") // filter out if needed
.collect(Collectors.toList());
