CODEWITHSUNDEEP
java
Brendon McCullum
Brendon McCullum

Reputation: 183

How do I check if a method is public in Java at run-time

To display all the methods of the class, whose name is entered through user-input at run-time in the form of a String, I do:

// String s is the class name entered

if (Class.forName(s).getDeclaredMethods().length > 0) {
    for (int i = 0; i < Class.forName(s).getDeclaredMethods().length; i++) {
            System.out.println(Class.forName(s).getDeclaredMethods()[i].toString());
    }
}

However, if I need to display just the public methods, what do I add?

Upvotes: 5

Views: 4138

Answers (3)

ThomasThiebaud
ThomasThiebaud

Reputation: 11969

You can get the modifiers using getModifiers(). Here is an idea (not tested)

for(Method m : Class.forName(s).getDeclaredMethods()) {
    if(m.getModifiers() == Modifier.PUBLIC) {
        //Do something
    }
}

There is also a isPublic method in the Modifier class (doc)

Upvotes: 2

Rahul Tripathi
Rahul Tripathi

Reputation: 172378

You can try like this:

if (Modifier.isPublic(method.getModifiers())) 
{
    //Yes the method is PUBLIC         
}

Refer getModifier:

Returns the Java language modifiers for the method represented by this Method object, as an integer. The Modifier class should be used to decode the modifiers.

Upvotes: 17

Peter Lawrey
Peter Lawrey

Reputation: 533442

I might write it like this.

for (Method m : Class.forName(s).getDeclaredMethods()) {
    boolean isPublic = (m.getModifiers() & Modifier.PUBLIC) != 0;
    System.out.println(m + " isPublic: " + isPublic);
}

Upvotes: 8

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