AWS examples for Java/Javascript

This is going to sound really stupid - so be it - but with the AWS examples - I see a lot of this coding - Can someone explain to me - basically - what the code is describing ??
I think I know, its giving substance/value to "Version", "Statement" etc but when I try this in Java, especially when compiling it in a package it does not fly. And I found this example in AWS SDK examples for Javascript/Java.
Could someone clear the air for me ?? And yes, I feel pretty stupid.
thank you.

{
  "Version":"2012-10-17",
  "Statement":[
    {
      "Sid":"PublicRead",
      "Effect":"Allow",
      "Principal": "*",
      "Action":["s3:GetObject"],
      "Resource":["arn:aws:s3:::examplebucket/*"]
    }
  ]
}

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