Passing in “any” class type into a java method

Question

Okay say I have a class:

public class ExampleClass() {
    public void exampleClassMethod(ArrayList abcdefg> arrList) {
        ....
             


        

Answer 1

For the second part

1)tester(Object s) method will accept all Types of Object because any Object in Java internally inherits from java.lang.Object. So tester((Object) abc); not required at all.

2)Typecast abc to CustomClass1 using CustomClass1 custom = (CustomClass1)abc. I hope it works.

3)You can use instanceOf operator but I guess this is lot of overhead for the developer & makes the code unreadable. Use it only if required.