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字节跳动nlp算法工程师面试问题及答案,设计模式学习--命令模式,关于网络优化你必须要知道的重点

字节跳动nlp算法工程师面试问题及答案,设计模式学习--命令模式,关于网络优化你必须要知道的重点

@Override

public void execute() {

prevSpeed = ceilingFan.getSpeed();

ceilingFan.high();

}

@Override

public void undo() {

if(prevSpeed == CeilingFan.HIGH) {

ceilingFan.high();

} else if(prevSpeed == CeilingFan.MEDIUM) {

ceilingFan.medium();

} else if(prevSpeed == CeilingFan.LOW) {

ceilingFan.low();

} else if(prevSpeed == CeilingFan.OFF) {

ceilingFan.off();

}

}

}

中风速

package undo;

public class CeilingFanMediumCommand implements Command {

CeilingFan ceilingFan;

int prevSpeed;

public CeilingFanMediumCommand(CeilingFan ceilingFan) {

this.ceilingFan = ceilingFan;

}

public void execute() {

prevSpeed = ceilingFan.getSpeed();

ceilingFan.medium();

}

public void undo() {

if (prevSpeed == CeilingFan.HIGH) {

ceilingFan.high();

} else if (prevSpeed == CeilingFan.MEDIUM) {

ceilingFan.medium();

} else if (prevSpeed == CeilingFan.LOW) {

ceilingFan.low();

} else if (prevSpeed == CeilingFan.OFF) {

ceilingFan.off();

}

}

}

低风速

package undo;

public class CeilingFanLowCommand implements Command {

CeilingFan ceilingFan;

int prevSpeed;

public CeilingFanLowCommand(CeilingFan ceilingFan) {

this.ceilingFan = ceilingFan;

}

public void execute() {

prevSpeed = ceilingFan.getSpeed();

ceilingFan.low();

}

public void undo() {

if (prevSpeed == CeilingFan.HIGH) {

ceilingFan.high();

} else if (prevSpeed == CeilingFan.MEDIUM) {

ceilingFan.medium();

} else if (prevSpeed == CeilingFan.LOW) {

ceilingFan.low();

} else if (prevSpeed == CeilingFan.OFF) {

ceilingFan.off();

}

}

}

电灯类

package undo;

public class Light {

String location;

int level;

public Light(String location) {

this.location = location;

}

public void on() {

level = 100;

System.out.println(“Light is on”);

}

public void off() {

level = 0;

System.out.println(“Light is off”);

}

public void dim(int level) {

this.level = level;

if (level == 0) {

off();

}

else {

System.out.println("Light is dimmed to " + level + “%”);

}

}

public int getLevel() {

return level;

}

}

打开电灯

package undo;

public class LightOnCommand implements Command {

Light light;

public LightOnCommand(Light light) {

this.light = light;

}

@Override

public void execute() {

light.on();

}

@Override

public void undo() {

light.off();

}

}

关闭电灯

package undo;

public class LightOffCommad implements Command {

Light light;

public LightOffCommad(Light light) {

this.light = light;

}

@Override

public void execute() {

light.off();

}

@Override

public void undo() {

light.on();

}

}

无命令

package undo;

public class NoCommand implements Command {

public void execute() { }

public void undo() { }

}

遥控器

package undo;

public class RemoteControlWithUndo {

Command[] onCommands;

Command[] offCommands;

Command undoCommand;

public RemoteControlWithUndo() {

onCommands = new Command[7];

offCommands = new Command[7];

Command noCommand = new NoCommand();

for(int i = 0; i < 7; i++) {

onCommands[i] = noCommand;

offCommands[i] = noCommand;

}

undoCommand = noCommand;

}

public void setCommand(int slot, Command onCommand, Command offCommand) {

onCommands[slot] = onCommand;

offCommands[slot] = offCommand;

}

public void onButtonWasPushed(int slot) {

onCommands[slot].execute();

undoCommand = onCommands[slot];

}

public void offButtonWasPushed(int slot) {

offCommands[slot].execute();

undoCommand = offCommands[slot];

}

//当按下撤销按钮,我们调用uodoCommand实例变量的undo()方法,就可以倒转前一个命令

public void undoButtonWasPushed() {

undoCommand.undo();

}

public String toString() {

StringBuffer stringBuff = new StringBuffer();

stringBuff.append(“\n------ Remote Control -------\n”);

for (int i = 0; i < onCommands.length; i++) {

stringBuff.append("[slot " + i + "] " + onCommands[i].getClass().getName()

  • " " + offCommands[i].getClass().getName() + “\n”);

}

stringBuff.append("[undo] " + undoCommand.getClass().getName() + “\n”);

return stringBuff.toString();

}

}

可以开始测试了

package undo;

public class RemoteLoader {

public static void main(String[] args) {

RemoteControlWithUndo remoteControl = new RemoteControlWithUndo();

//第一组测试

Light livingRoomLight = new Light(“Living Room”);

LightOnCommand livingRoomLightOn =

new LightOnCommand(livingRoomLight);

LightOffCommad livingRoomLightOff =

new LightOffCommad(livingRoomLight);

remoteControl.setCommand(0, livingRoomLightOn, livingRoomLightOff);

remoteControl.onButtonWasPushed(0);

remoteControl.offButtonWasPushed(0);

System.out.println(remoteControl);

remoteControl.undoButtonWasPushed();

remoteControl.offButtonWasPushed(0);

remoteControl.onButtonWasPushed(0);

System.out.println(remoteControl);

remoteControl.undoButtonWasPushed();

//第二组测试

CeilingFan ceilingFan = new CeilingFan(“Living Room”);

CeilingFanMediumCommand ceilingFanMedium =

new CeilingFanMediumCommand(ceilingFan);

CeilingFanHighCommand ceilingFanHigh =

new CeilingFanHighCommand(ceilingFan);

CeilingFanOffCommand ceilingFanOff =

new CeilingFanOffCommand(ceilingFan);

remoteControl.setCommand(0, ceilingFanMedium, ceilingFanOff);

remoteControl.setCommand(0, ceilingFanHigh, ceilingFanOff);

remoteControl.onButtonWasPushed(0); //首先以中速开启风扇

remoteControl.offButtonWasPushed(0);//关闭

System.out.println(remoteControl);

remoteControl.undoButtonWasPushed();

remoteControl.onButtonWasPushed(1); //首先以中速开启风扇

System.out.println(remoteControl);

remoteControl.undoButtonWasPushed();

}

}

测试结果:

Light is on

Light is off

------ Remote Control -------

[slot 0] undo.LightOnCommand    undo.LightOffCommad

[slot 1] undo.NoCommand    undo.NoCommand

[slot 2] undo.NoCommand    undo.NoCommand

[slot 3] undo.NoCommand    undo.NoCommand

[slot 4] undo.NoCommand    undo.NoCommand

[slot 5] undo.NoCommand    undo.NoCommand

[slot 6] undo.NoCommand    undo.NoCommand

[undo] undo.LightOffCommad

Light is on

Light is off

Light is on

------ Remote Control -------

[slot 0] undo.LightOnCommand    undo.LightOffCommad

[slot 1] undo.NoCommand    undo.NoCommand

[slot 2] undo.NoCommand    undo.NoCommand

[slot 3] undo.NoCommand    undo.NoCommand

[slot 4] undo.NoCommand    undo.NoCommand

[slot 5] undo.NoCommand    undo.NoCommand

[slot 6] undo.NoCommand    undo.NoCommand

[undo] undo.LightOnCommand

Light is off

------ Remote Control -------

[slot 0] undo.CeilingFanHighCommand    undo.CeilingFanOffCommand

[slot 1] undo.NoCommand    undo.NoCommand

[slot 2] undo.NoCommand    undo.NoCommand

[slot 3] undo.NoCommand    undo.NoCommand

[slot 4] undo.NoCommand    undo.NoCommand

[slot 5] undo.NoCommand    undo.NoCommand

[slot 6] undo.NoCommand    undo.NoCommand

[undo] undo.CeilingFanOffCommand

------ Remote Control -------

[slot 0] undo.CeilingFanHighCommand    undo.CeilingFanOffCommand

[slot 1] undo.NoCommand    undo.NoCommand

[slot 2] undo.NoCommand    undo.NoCommand

[slot 3] undo.NoCommand    undo.NoCommand

[slot 4] undo.NoCommand    undo.NoCommand

[slot 5] undo.NoCommand    undo.NoCommand

[slot 6] undo.NoCommand    undo.NoCommand

[undo] undo.NoCommand

4. party (使用宏命令的命令模式)

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