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    In Java, an interface is an abstract type that defines a contract of methods a class must implement, without specifying how they are implemented. It is primarily used to achieve abstraction and multiple inheritance.

    By default:

    • All variables are public static final (constants).

    • All methods are public abstract (unless they are default, static, or private in newer Java versions).

    Since Java 8, interfaces can have:

    • Default methods (with implementation)

    • Static methods (called via interface name)

    Since Java 9, they can also have:

    • Private methods (for internal use within the interface)

    Basic Example:

    interface TestInterface {
    int A = 10; // public static final by default
    void display(); // public abstract by default
    }

    class TestClass implements TestInterface {
    public void display() {
    System.out.println("Geek");
    }
    }

    public class Main {
    public static void main(String[] args) {
    TestClass t = new TestClass();
    t.display();
    System.out.println(t.A);
    }
    }
    Gekopieerd.

    Multiple Inheritance with Interfaces:

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  2. W3School
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  4. Baeldung
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    • Gepubliceerd: 9 jan. 2019
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