Unsupported major.minor version 52.0 [duplicate]

Pictures:

Hello.java

import java.applet.Applet;
import java.awt.*;

public class Hello extends Applet {

    // Java applet to draw "Hello World"
    public void paint (Graphics page) {
        page.drawString ("Hello World!", 50, 50);
    }
}

Hello.html

<HTML>
    <HEAD>
        <TITLE>HelloWorld Applet</TITLE>
    </HEAD>

    <BODY>
        <APPLET CODE="Hello.class" WIDTH=300 HEIGHT=150>
        </APPLET>
    </BODY>
</HTML>

Error

Hello : Unsupported major.minor version 52.0

What may the problem be?

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