Access class methods from an object that is that class

Question

I am trying to make an checkFalse method where i take Object as an argument. I now want to check if that Object is the same type as this.getClass(). If it is of the same type, i now want to cast the Object to that class in order to access the methods of that object class!

For example, how can i access the SomeMethod from that f object? I am trying to convert the object F to the class testMain.

Error: Cannot be cast to testMain

class testMain implements testest
{

}

interface testest
{
    public default boolean SomeMethod()
    {

    }

    public default boolean checkFalse(Object f) throws  ClassCastException
    {
        try 
        {
            f = this.getClass();
        } 
        catch (ClassCastException exception) 
        {
            throw exception;
        }
        f = (testMain)f; //Here. How do i turn this object to the    class testMain so that i can access that objects methods? For example, how can i access the SomeMethod through this f object?
     }
}

I've removed the c# code since this is clearly a Java question. — Zohar Peled
– Zohar Peled, Commented Feb 10, 2019 at 11:15
Okay sure. Included c# because they are almost identical. But fair enough! — Weird random
– Weird random, Commented Feb 10, 2019 at 11:16
You have to cast to testest (not testMain). By the way: Stick to the Java code conventions, and write class and interface names in CamelCase. — Seelenvirtuose
– Seelenvirtuose, Commented Feb 10, 2019 at 11:17
I tried that but i get the same error only now it says "Cannot be cast to testtest" — Weird random
– Weird random, Commented Feb 10, 2019 at 11:19
Casting to testest gives you the error "cannot be cast to Queue" ??? — Seelenvirtuose
– Seelenvirtuose, Commented Feb 10, 2019 at 11:20

Oleg Cherednik · Accepted Answer · 2019-02-10 11:26:52Z

0

public default boolean checkFalse(Object f) {
    if(f instanceof testest) {
        ((testest)f).someMethod();
    } else
        throw new RuntimeException();
}

answered Feb 10, 2019 at 11:26

Oleg Cherednik

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