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What is the result of print statement in this Java program (-=)?

publish date: 2020/09/05 02:29:00 GMT+10

Missing
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public class AssShortcutExample {
   public static void main(String args[]) {
      int num1 = 10;
      int num2 = 20;

      num2 -= num1;
      System.out.println("= Result: "+num2);
    }
}

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