Java架构师-十项全能学习笔记(1) @Configuration @EnableStateMachine public class OrderStateMachineConfig extends EnumStateMachineConfigurerAdapter<OrderState, OrderEvent> { @Override public void configure(StateMachineStateConfigurer<OrderState, OrderEvent>…
Immutable Strings Objects of the String class are immutable. If you examine the JDK documentation for the String class, you’ll see that every method in the class that appears to modify a String actually creates and returns a brand new String object c…