I am attempting to write a method the executes a static method from another class by passing an array of strings as arguments to the method.
Here's what I have:
public static void
executeStaticCommand(final String[] command, Class<?> provider)
{
Method[] validMethods = provider.getMethods();
String javaCommand = TextFormat.toCamelCase(command[0]);
for (Method method : validMethods) {
if (method.getName().equals(javaCommand)) {
try {
method.invoke(null, new Object[] { new Object[] { command } });
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
Throwable ex = e.getCause();
ex.printStackTrace();
}
break;
}
}
}
Such that this:
String[] args = new String[] { "methodName", "arg1", "arg2" };
executeStaticCommand(args, ClassName.class);
Should execute this:
public class ClassName {
public static void methodName(String[] args) {
assert args[1].equals("arg1");
}
}
However I'm getting IllegalArgumentException
s.
You have two problems:
String[]
, but you're passing in a Object[]
The problems are all in the inner try
block, so I show only that code.
String[] args = Arrays.copyOfRange(command, 1, command.length - 1);
method.invoke(null, new Object[]{args}); // must prevent expansion into varargs
Thanks to Perception for reminding me of the varargs issue
The method your trying to invoke is expecting String array, however you are passing Object array as param. Change it to String array Or you can pass any type if the method expects Object.
method.invoke(null,(Object) command );
基于这个问题 ,看起来应该是这样的
method.invoke(null, command);
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