利用反射破坏单例模式

创建一个单例

public class SingleBean {
    private static SingleBean instance=new SingleBean();
    private SingleBean(){}
    public static SingleBean getInstance(){
        return instance;
    }
}

SingleBean instance = SingleBean.getInstance();
        SingleBean instance2 = SingleBean.getInstance();
        System.out.println(instance==instance2);

运行结果

利用反射破坏该单例

try {
            Class objectClass=SingleBean.class;
            Constructor constructor=objectClass.getDeclaredConstructor();
            constructor.setAccessible(true);
            SingleBean instance=SingleBean.getInstance();
            SingleBean newInstance = (SingleBean) constructor.newInstance();
            System.out.println(instance==newInstance);
        } catch (Exception e) {
            e.printStackTrace();
        }

运行结果