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We can see that the value of a and b has been changed, which means that when you declare a reference final, it only means that the reference can not be changed but the contents it refer to can still be changed!
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NonCompliant Solution
If you do not want to change a and b after they are initialized, the simplest approach is to declare a and b final: private final int a;
private final int b;
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 private final int a;
 private final int b;
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But now you can not have setter method of a and b.
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