如何引用groovy管道脚本中的参数？

pipeline {
    agent any
    parameters {
        string(name: 'nameParam', defaultValue: 'John', description: 'Name parameter')
        booleanParam(name: 'flagParam', defaultValue: true, description: 'Flag parameter')
    }
    stages {
        stage('Example Stage') {
            steps {
                script {
                    def name = params.nameParam
                    def flag = params.flagParam

                    println "Name: ${name}"
                    println "Flag: ${flag}"
                }
            }
        }
    }
}