JAR API

Manifest manifest = new Manifest();

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Manifest manifest = new Manifest();

Attributes  mainAttribs = manifest.getMainAttributes(); 

mainAttribs.put(Attributes.Name.MANIFEST_VERSION, "1.0"); 

mainAttribs.put(Attributes.Name.MAIN_CLASS, "cn.sxt.Main");

 mainAttribs.put(Attributes.Name.SEALED, "true");

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Map<String,Attributes> attribsMap = manifest.getEntries();

Attributes attribs  = new Attributes();

Attributes.Name name = new Attributes.Name("Sealed");

attribs.put(name, "false");

attribsMap.put("cn/sxt/archives/", attribs);