从java中的枚举列表中删除元素

import java.util.HashSet;
import java.util.Set;

public class ConstantManager {
    private Set<String> constants = new HashSet<>();

    public ConstantManager() {
        constants.add("CONSTANT1");
        constants.add("CONSTANT2");
        constants.add("CONSTANT3");
    }

    public void addConstant(String constant) {
        constants.add(constant);
    }

    public void removeConstant(String constant) {
        constants.remove(constant);
    }

    public Set<String> getConstants() {
        return constants;
    }

    public static void main(String[] args) {
        ConstantManager manager = new ConstantManager();
        System.out.println("Initial constants: " + manager.getConstants());

        manager.addConstant("CONSTANT4");
        System.out.println("After adding CONSTANT4: " + manager.getConstants());

        manager.removeConstant("CONSTANT2");
        System.out.println("After removing CONSTANT2: " + manager.getConstants());
    }
}