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final Set<Expression> exps = meng.getExps();
Iterator<Expression> iterator = exps.iterator();
final Expression displayedExp = exps.iterator().next();
exps.remove(displayedExp);
This code would return the following run-time exceptions trace:
null
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableCollection.remove(Collections.java:1021)
The Set implementation of meng.getExps() is a LinkedHashSet.
Sorry, you are out of luck: The Set was wrapped with Collections.unmodifiableCollection, which does exactly this: making the collection unmodifiable. The only thing you can do is copy the content into another Set and work with this.