Answer Posted / samuelj/samsjjj@gmail.com

java does not support Multiple inheritance so we can use
Interface
interface contains the abstract methods

Can we use different return types for methods when overridden?

552

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How do you add an element to an arraylist in java?

481

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What are the advantages of java inner classes?

552

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Can we make the abstract methods static in java?

579

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What is externalizable?

609

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Can an abstract class be a final class?

527

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What is pojo class in java?

530

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What is the purpose of garbage collection in java, and when is it used?

556

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What is native code?

531

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What is the hashcode () and equals () used for?

531

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What are the advantages of exception handling in java?

644

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What does \ mean in regex?

617

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Which methods cannot be overridden in java?

531

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What will happen if non-synchronized method calls a static synchronized method and what kind of lock it acquires?

511

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Can a class have more than one object?

518

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