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Bicycle.java
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Bicycle.java
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public class Bicycle {
int gears;
int topSpeed;
int currentGear;
int currentPosition;
int currentSpeed;
String bikeName;
static int maxLineLength = 20;
public Bicycle(int gears, int topSpeed, String bikeName) {
this.gears = gears;
this.topSpeed = topSpeed;
this.bikeName = bikeName;
currentGear = 1;
currentSpeed = 0;
currentPosition = 0;
}
public void pedal(int revs) {
int speedPerGear = topSpeed / gears;
int gearRevs = revs * currentGear;
currentSpeed = gearRevs * speedPerGear;
move(1);
}
public void shiftUp() {
if (currentGear < gears) {
currentGear++;
}
}
public void shiftDown() {
if (currentGear > 1) {
currentGear--;
}
}
public void slowDown(int speed) {
if (currentSpeed > speed) {
currentSpeed -= speed;
}
}
public void glide(int seconds) {
while (seconds > 0) {
currentPosition += currentSpeed;
slowDown(1);
try {
Thread.sleep(1000);
seconds--;
display();
} catch (Exception e) {};
}
}
public void display() {
int nameLength = bikeName.length();
int segLength = (maxLineLength - nameLength - 2)/2;
String lineSeg = "";
for (int i = 0; i < segLength; i++) {
lineSeg += "-";
}
String extraSeg = lineSeg.length() % 2 == 1 ? "-" : "";
System.out.println(lineSeg + extraSeg + " " + bikeName + " " + lineSeg);
System.out.println(padCenter("Position", currentPosition));
System.out.println(padCenter("Speed", currentSpeed));
System.out.println(padCenter("Gear", currentGear));
}
private <T> String padCenter(String key, T value) {
return padCenter(key, String.valueOf(value));
}
private String padCenter(String key, String value) {
int size = key.length() + value.length();
int paddingSize = maxLineLength - size;
String padding = "";
for (int i = 0; i < paddingSize; i++) {
padding += " ";
}
return key + padding + value;
}
private void move(int seconds) {
currentPosition += currentSpeed * seconds;
}
public static void main(String[] args) {
Bicycle myBike = new Bicycle(6, 24, "Stinger");
myBike.display();
myBike.pedal(5);
myBike.shiftUp();
myBike.pedal(2);
myBike.display();
myBike.shiftDown();
myBike.display();
myBike.pedal(2);
myBike.shiftDown();
myBike.shiftDown();
myBike.shiftDown();
myBike.pedal(2);
myBike.display();
myBike.glide(10);
}
}