public void createRole(IamClient client) {
    
    CreateRoleRequest createRoleRequest = new CreateRoleRequest();
    // 设置角色名
    createRoleRequest.setName("test_role_name");
    // 设置角色描述
    createRoleRequest.setDescription("test_description");
    // 指定允许扮演角色的载体
    createRoleRequest.setAssumeRolePolicyDocument("{\"version\":\"v1\",\"accessControlList\":[{\"service\":\"bce:iam\"," +
                "\"permission\":[\"AssumeRole\"],\"region\":\"*\",\"grantee\":[{\"id\":\"grantee-id\"}],\"effect\":\"Allow\"}]}");
                
    client.createRole(createRoleRequest);
}

public void getRole(IamClient client) {
    // 角色名
    String roleName = "test_role_name";
    client.getRole(roleName);
}

public void updateRole(IamClient client) {
    // 旧的角色名
    String roleName = "old_role_name";
    UpdateRoleRequest updateRoleRequest = new UpdateRoleRequest();
    // 设置更新的角色名
    updateRoleRequest.setName("new_role_name");
    // 更新的角色描述
    updateRoleRequest.setDescription("new_role_description");
    // 更新的允许扮演角色的载体
    updateRoleRequest.setAssumeRolePolicyDocument("{\"version\":\"v1\",\"accessControlList\":[{\"service\":\"bce:iam\"," +
                "\"permission\":[\"AssumeRole\"],\"region\":\"*\",\"grantee\":[{\"id\":\"grantee-id\"}],\"effect\":\"Allow\"}]}");
                
    client.updateUser(roleName, updateRoleRequest);
}

public void deleteRole(IamClient client) {
    // 角色名
    String roleName = "test_role_name";
    
    client.deleteRole(roleName);
}

public void listUser(IamClient client) {
    client.listUser();
}