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在Java中,对象的状态管理和状态转换通常通过以下几种方式实现:
public enum State {
STATE_A,
STATE_B,
STATE_C;
public void nextState() {
switch (this) {
case STATE_A:
this = STATE_B;
break;
case STATE_B:
this = STATE_C;
break;
case STATE_C:
this = STATE_A;
break;
}
}
}
public interface State {
void handle(Context context);
}
public class StateA implements State {
@Override
public void handle(Context context) {
System.out.println("Handling in StateA");
context.setState(new StateB());
}
}
public class StateB implements State {
@Override
public void handle(Context context) {
System.out.println("Handling in StateB");
context.setState(new StateC());
}
}
public class StateC implements State {
@Override
public void handle(Context context) {
System.out.println("Handling in StateC");
context.setState(new StateA());
}
}
public class Context {
private State state;
public Context() {
state = new StateA();
}
public void setState(State state) {
this.state = state;
}
public void request() {
state.handle(this);
}
}
public interface Strategy {
void execute();
}
public class StrategyA implements Strategy {
@Override
public void execute() {
System.out.println("Executing strategy A");
}
}
public class StrategyB implements Strategy {
@Override
public void execute() {
System.out.println("Executing strategy B");
}
}
public class StrategyC implements Strategy {
@Override
public void execute() {
System.out.println("Executing strategy C");
}
}
public class Context {
private Strategy strategy;
public Context(Strategy strategy) {
this.strategy = strategy;
}
public void setStrategy(Strategy strategy) {
this.strategy = strategy;
}
public void executeStrategy() {
strategy.execute();
}
}
这些方法可以根据具体需求进行选择和调整,以实现Java对象的状态管理和状态转换。
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