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

# ContractId

> This class is used as a super class for all concrete ContractIds generated by the java codegen with the following properties: Foo.ContractId fooCid = new Foo.ContractId("test"); Bar.ContractId barCid = new Bar.ContractId("test"); ContractId<Foo> genericFooCid = new ContractId<>("test"); ContractId<Foo> genericBarCid = new ContractId<>("test"); fooCid.equals(genericFooCid) == true; genericFooCid.equals(fooCid) == true; fooCid.equals(barCid) == false; barCid.equals(fooCid) == false; Due to erase, we cannot distinguish ContractId<Foo> from ContractId<Bar>, thus: fooCid.equals(genericBarCid) == true genericBarCid.equals(fooCid) == true genericFooCid.equals(genericBarCid) == true genericBarCid.equals(genericFooCid) == true

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

  <p class="x2mdx-ref-summary">This class is used as a super class for all concrete ContractIds generated by the java codegen with the following properties: Foo.ContractId fooCid = new Foo.ContractId("test"); Bar.ContractId barCid = new Bar.ContractId("test"); ContractId\<Foo> genericFooCid = new ContractId\<>("test"); ContractId\<Foo> genericBarCid = new ContractId\<>("test"); fooCid.equals(genericFooCid) == true; genericFooCid.equals(fooCid) == true; fooCid.equals(barCid) == false; barCid.equals(fooCid) == false; Due to erase, we cannot distinguish ContractId\<Foo> from ContractId\<Bar>, thus: fooCid.equals(genericBarCid) == true genericBarCid.equals(fooCid) == true genericFooCid.equals(genericBarCid) == true genericBarCid.equals(genericFooCid) == true</p>

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## Signature

```java theme={null}
public class ContractId<T> extends Object implements Exercises<ExerciseCommand>
```

## Members

| Member                                        | Lifecycle     | Upstream docs                                                                                                                                                                        |
| --------------------------------------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `ContractId(String)`                          | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#%3Cinit%3E%28java.lang.String%29)                                   |
| `contractId`                                  | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#contractId)                                                         |
| `equals(Object)`                              | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#equals%28java.lang.Object%29)                                       |
| `hashCode()`                                  | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#hashCode%28%29)                                                     |
| `makeExerciseCmd(Choice<?, ? super A, R>, A)` | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#makeExerciseCmd%28com.daml.ledger.javaapi.data.codegen.Choice,A%29) |
| `toString()`                                  | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#toString%28%29)                                                     |
| `toValue()`                                   | Added `3.4.8` | [Open](https://javadoc.io/doc/com.daml/bindings-java/3.5.15/com/daml/ledger/javaapi/data/codegen/ContractId.html#toValue%28%29)                                                      |

## History

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