Java Set. Contains() method: judge whether the set set contains the specified object

• Java

contains(Object o)

Typical application

public static void main(String[] args){
    Set set = new HashSet();
    set.add(new Date());
    set.add("apple");
    set.add(new Socket());
    boolean contains = set.contains("apple");
    if(contains){
    System.out.println("Set集合包含字符串apple");
    }else{
    System.out.println("Set集合不包含字符串apple");
  }
}
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