> ## Documentation Index
> Fetch the complete documentation index at: https://cantonfoundation-generated-references-canton-protobuf-histo.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ContractWithKey

> A superclass for all codegen-generated Contracts whose templates have a key defined.

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  <h1 class="x2mdx-ref-title">ContractWithKey</h1>

  <p class="x2mdx-ref-summary">A superclass for all codegen-generated Contracts whose templates have a key defined.</p>

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## Signature

```java theme={"theme":{"light":"github-light","dark":"github-dark"}}
public abstract class ContractWithKey<Id,Data,Key> extends Contract<Id,Data>
```

## Members

| Member | Lifecycle | Upstream docs |
| - | - | - |
| `equals(Object)` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#equals%28java.lang.Object%29) |
| `hashCode()` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#hashCode%28%29) |
| `key` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#key) |
| `keyJsonEncoder()` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#keyJsonEncoder%28%29) |
| `keyToJson()` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#keyToJson%28%29) |
| `toString()` | - | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.17/com/daml/ledger/javaapi/data/codegen/ContractWithKey.html#toString%28%29) |