How to use the immutable class set of Java constructs

The first thing to use is collections. unmodifiable xxx () this function

See the following code for the rest.

It is said that this function has a bug, and then out of guava

1ImportJava.util.Collection;
2ImportJava.util.Collections;
3 ImportJava.util.HashSet;
4ImportJava.util.Set;
5
6
7 PublicclassGuava {
8 PublicStatic voidMain (string[] args) {
9Set<string> set=NewHashset<string> ();
TenSet.add ("Hello");
OneSet.add ("Insert");
ASet<string> Unmodify=collections.unmodifiableset (set);
-SYSTEM.OUT.PRINTLN (set);
-
the}

-  }

How to use the immutable class set of Java constructs