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Check the class version

import java.io.DataInputStream; import java.io.FileInputStream; import java.io.IOException; public class Main {   public static void main(String[] args) throws IOException {     DataInputStream in = new DataInputStream(new FileInputStream("Main.class"));     int start = in.readInt();     if (start != 0xcafebabe) {       System.out.println("not valid");     }     in.close();     System.out.println(in.readUnsignedShort()+"/"+in.readUnsignedShort());        } }