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<td></td><td>Abstract</td><td>Interface</td></tr>
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<td>Declaration keyword</td><td><code>abstract</code></td><td><code>interface</code></td></tr>
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<td>Objects can be created?</td><td>No</td><td>No</td></tr>
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<td>Contains Abstract and concrete methods?</td><td>Both</td><td>Only Abstract methods</td></tr>
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<td>Are any keywords required for methods?</td><td>Abstract methods required to mention <code>abstract</code> keyword</td><td>Not required</td></tr>
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<td>Contain any Constructors?</td><td>Yes</td><td>No</td></tr>
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<td>inheritance</td><td>An abstract class can extend only from other abstract class</td><td>Interfaces can extend only to other interfaces</td></tr>
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<td>number of inheritances possible</td><td>Only 1</td><td>many</td></tr>
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<td>Types of modifiers can be used</td><td>final, non-final, static, non-static</td><td>final, static</td></tr>
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|  | Abstract | Interface |
| --- | --- | --- |
| Declaration keyword | `abstract` | `interface` |
| Objects can be created? | No | No |
| Contains Abstract and concrete methods? | Both | Only Abstract methods |
| Are any keywords required for methods? | Abstract methods required to mention `abstract` keyword | Not required |
| Contain any Constructors? | Yes | No |
| inheritance | An abstract class can extend only from other abstract class | Interfaces can extend only to other interfaces |
| number of inheritances possible | Only 1 | many |
| Types of modifiers can be used | final, non-final, static, non-static | final, static |

	Abstract	Interface
Declaration keyword	`abstract`	`interface`
Objects can be created?	No	No
Contains Abstract and concrete methods?	Both	Only Abstract methods
Are any keywords required for methods?	Abstract methods required to mention `abstract` keyword	Not required
Contain any Constructors?	Yes	No
inheritance	An abstract class can extend only from other abstract class	Interfaces can extend only to other interfaces
number of inheritances possible	Only 1	many
Types of modifiers can be used	final, non-final, static, non-static	final, static

Abstract vs Interface (Java)