Java Language Tutorial => Abstract Methods & Classes

Example

declared without an implementation

pure virtual method

virtual void eat(void) = 0;

abstract method

abstract void draw();

cannot be instantiated

cannot be instantiated; has at least 1 pure virtual method

class AB {public: virtual void f() = 0;};

cannot be instantiated; can have non-abstract methods

abstract class GraphicObject {}

no instance fields

nothing comparable to Java

very similar to abstract class, but 1) supports multiple inheritance; 2) no instance fields

interface TestInterface {}

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