如何在java中创建JSONArray

我如何创建如下的JSON数组。

[     
      {
          "firstName" : "Ng Sharma"
      },
      {
      "phone" : "1234567890"
      },
      {
          "emailAddress" : "ngsharma@gmail.com"
      },
      {
          "mx_Courses" : "IAS,IPS,IES"
      }
]