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当我试着写出java伪代码，或者“Hello world”代码时，它一直在说“

[{
    "resource": "/workspaces/Java/Main/main.java",
    "owner": "_generated_diagnostic_collection_name_#2",
    "code": "536871240",
    "severity": 8,
    "message": "The declared package \"\" does not match the expected package \"Main\"",
    "source": "Java",
    "startLineNumber": 1,
    "startColumn": 1,
    "endLineNumber": 1,
    "endColumn": 2
}]

“、“

[{
    "resource": "/workspaces/Java/Main/main.java",
    "owner": "_generated_diagnostic_collection_name_#2",
    "code": "1610612940",
    "severity": 8,
    "message": "Syntax error on token \"puplic\", public expected",
    "source": "Java",
    "startLineNumber": 1,
    "startColumn": 1,
    "endLineNumber": 1,
    "endColumn": 7
}]

“、以及“

[{
    "resource": "/workspaces/Java/Main/main.java",
    "owner": "_generated_diagnostic_collection_name_#2",
    "code": "67108974",
    "severity": 4,
    "message": "This method has a constructor name",
    "source": "Java",
    "startLineNumber": 2,
    "startColumn": 24,
    "endLineNumber": 2,
    "endColumn": 47
}]

“
我写出了w3schools说的“你好世界”的代码

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello World");
  }
}

它只是弹出了上面提到的错误。请帮助我。
一个全新的java开发。