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-# java-sdk
+# Bytom java-sdk
+
+This page will document the API classes and ways to properly use the API.
+Subsequent new releases also maintain backward compatibility with this class approach.
+
+## Basic Usage
+
+```
+public static Client generateClient() throws BytomException {
+    String coreURL = Configuration.getValue("bytom.api.url");
+    String accessToken = Configuration.getValue("client.access.token");
+    if (coreURL == null || coreURL.isEmpty()) {
+        coreURL = "http://127.0.0.1:9888/";
+    }
+    return new Client(coreURL, accessToken);
+}
+
+Client client = TestUtils.generateClient();
+```
+
+## Usage
+
+* [`Step 1: Create a key`](#create-a-key)
+* [`Step 2: Create an account`](#create-an-account)
+* [`Step 3: Create an receiver`](#create-an-receiver)
+* [`Step 4: Create an asset`](#create-an-asset)
+* [`Step 5: Issue asset`](#issue-asset)
+    * [`Firstly build the transaction`](#firstly-build-the-transaction)
+    * [`Secondly sign the transaction`](#secondly-sign-the-transaction)
+    * [`Finally submit the transaction`](#finally-submit-the-transaction)
+
+> For more details, see ![`API methods`](https://github.com/Bytom/java-sdk/blob/master/doc/index.md#api-methods)
+
+## Create a key
+
+```java
+String alias = "test";
+String password = "123456";
+
+Key.Builder builder = new Key.Builder().setAlias(alias).setPassword(password);
+Key key = Key.create(client, builder);
+```
+
+## Create an account
+
+```java
+String alias = "sender-account";
+Integer quorum = 1;
+List<String> root_xpubs = new ArrayList<String>();
+root_xpubs.add(senderKey.xpub);
+
+Account.Builder builder = new Account.Builder().setAlias(alias).setQuorum(quorum).setRootXpub(root_xpubs);
+
+Account account = Account.create(client, builder);
+```
+
+## Create an receiver
+
+```java
+String alias = receiverAccount.alias;
+String id = receiverAccount.id;
+
+Account.ReceiverBuilder receiverBuilder = new Account.ReceiverBuilder().setAccountAlias(alias).setAccountId(id);
+Receiver receiver = receiverBuilder.create(client);
+```
+
+## Create an asset
+
+```java
+ String alias = "receiver-asset";
+
+List<String> xpubs = receiverAccount.xpubs;
+
+Asset.Builder builder = new Asset.Builder()
+                        .setAlias(alias)
+                        .setQuorum(1)
+                        .setRootXpubs(xpubs);
+receiverAsset = builder.create(client);
+```
+
+## Issue asset
+
+### Firstly build the transaction
+
+```java
+Transaction.Template controlAddress = new Transaction.Builder()
+        .addAction(
+                new Transaction.Action.SpendFromAccount()
+                        .setAccountId(senderAccount.id)
+                        .setAssetId(senderAsset.id)
+                        .setAmount(300000000)
+        )
+        .addAction(
+                new Transaction.Action.ControlWithAddress()
+                        .setAddress(receiverAddress.address)
+                        .setAssetId(senderAsset.id)
+                        .setAmount(200000000)
+        ).build(client);
+```
+
+### Secondly sign the transaction
+
+```java
+Transaction.Template singer = new Transaction.SignerBuilder().sign(client,
+        controlAddress, "123456");
+```
+
+### Finally submit the transaction
+
+```java
+Transaction.SubmitResponse txs = Transaction.submit(client, singer);
+```