Java Set. Remove() method: removes the specified object from the set collection

remove(Object o)

Typical application

public static void main(String[] args){
    Set set = new HashSet();  //定义Set对象
    set.add("apple");  //向集合中添加对象
    set.add("配置优良的计算机");
    set.add("book");
    System.out.println("Set大小为:"+set.size());  //输出集合大小
    set.remove("book");  //移除集合元素
    System.out.println("从Set集合移除了\"book\"");
    System.out.println("Set大小为:"+set.size());
}