Question

我正在尝试创建一个程序，您可以在其中更改风扇的速度，颜色，半径，以及是否可以打开或关闭风扇，我的粉丝类工作正常，除了toString（）方法，某些原因，当我在测试程序中设置一些值时，它只是默认为常规值，接受任何帮助。

谢谢。

public class Fan {
final int SLOW = 1;
final int MEDIUM = 2;
final int FAST = 3;

public int speed = SLOW;
public boolean on = false;
public double radius = 5;
public String color = new String("blue");
//fan on
boolean fanOn() {
   on = true;
   return on;
}
//fan off
boolean fanOff() {
   on = false;
   return on;
}
//sets fan speed
String setSpeed(String speed) {
if (speed == "SLOW"){
   speed = String.valueOf(SLOW);
} else if (speed == "MEDIUM") {
   speed = String.valueOf(MEDIUM);
} else if (speed == "FAST") {
   speed = String.valueOf(FAST);
} else {
   speed = "Please enter 'SLOW', 'MEDIUM' or 'FAST' to change the speed of the fan.";
}
   return speed;
}
//sets custom radius
double setRadius(double rad) {
   rad = radius;
   return rad;
}
//sets custom color
String setColor(String colorType) {
   return colorType;
}
//toString() method
public String toString() {
   return ("Speed: " + speed + "\nRadius: " + radius + "\nColor: " + "\nOn: " + on);
 }
}

//test program

 public class TestFan {
 public static void main(String[] args) {
   Fan fan1 = new Fan();
   fan1.setColor("green");
   fan1.setSpeed("FAST");
   fan1.setRadius(3.5);
   fan1.fanOff();
   System.out.println(fan1.toString());

 }
}

这只是输出：

Speed: 1
Radius: 5.0
Color: 
On: false

Answer 1

public class Fan {
final int SLOW = 1;
final int MEDIUM = 2;
final int FAST = 3;

public int speed = SLOW;
public boolean on = false;
public double radius = 5;
public String color = new String("blue");
//fan on
void fanOn() {
   on = true;
   return on;
}
//fan off
void fanOff() {
   on = false;
   return on;
}
//sets fan speed
void setSpeed(String speed) {
   this.speed=speed;
}
//sets custom radius
double setRadius(double rad) {
   rad = radius;
   return rad;
}
//sets custom color
void setColor(String colorType) {
   color = colorType;
}
//toString() method
public String toString() {
   return ("Speed: " + speed + "\nRadius: " + radius + "\nColor: " + "\nOn: " + on);
 }
}

//test program

 public class TestFan {
 public static void main(String[] args) {
   Fan fan1 = new Fan();
   fan1.setColor("green");
   fan1.setSpeed("FAST");
   fan1.setRadius(3.5);
   fan1.fanOff();
   System.out.println(fan1.toString());

 }
}

Fan to prob with toString（）方法 - 简单

1 个答案: