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java - 为什么这是一个无法访问的语句?

转载 作者:行者123 更新时间:2023-12-01 06:26:49 34 4
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在这段代码的底部,我收到了“无法访问的语句”错误。我尝试了一些方法,但无法弄清楚为什么会发生这种情况。错误位于代码底部(我已用//注释了错误所在)请帮助我指出正确的方向,我被难住了!

/**
* Describes a certain model.
*
* @author (Joshua Baker)
* @version (1.0)
*/
public class Model
{
public static final int IN_PER_FOOT = 12;
public static final int BASE_RATE = 60;
public static final int TALL_INCHES = 67;
public static final double THIN_POUNDS = 140.0;
public static final int TALL_THIN_BONUS = 5;
public static final int TRAVEL_BONUS = 4;
public static final int SMOKER_DEDUCTION = 10;

private String firstName;
private String lastName;
private int heightInInches;
private double weightInPounds;
private boolean travel;
private boolean smokes;
private String newHeight;
private int perHourRate;

/**
* Default constructor
*/
public Model()
{
setFirstName ("");
setLastName ("");
setHeightInInches (0);
setWeightInPounds (0.0);
setTravel (false);
setSmokes (false);
}

/**
*
*/
public Model (String whatIsFirstName, String whatIsLastName, int whatIsHeight, double whatIsWeight,
boolean canTravel, boolean smoker)
{
setFirstName (whatIsFirstName);
setLastName (whatIsLastName);
setHeightInInches (whatIsHeight);
setWeightInPounds (whatIsWeight);
setTravel (canTravel);
setSmokes (smoker);
}

/**
*@return first name
*/
public String getFirstName()
{
return firstName;
}

/**
*@return last name
*/
public String getLastName()
{
return lastName;
}

/**
*@return height in inches
*/
public int getHeightInInches()
{
return heightInInches;
}

/**
*@return the converted height
*/
public String getNewHeight()
{
return newHeight;
}

/**
*@return weight in pounds
*/
public double getWeightInPounds()
{
return weightInPounds;
}

/**
*@return models pay per hour rate
*/
public int getPerHourRate()
{
return perHourRate;
}


/**
*@return travel
*/
public boolean getTravel()
{
return travel;
}

/**
*@return smokes
*/
public boolean getSmokes()
{
return smokes;
}

/**
* models first name
*/
public void setFirstName(String whatIsFirstName)
{
firstName = whatIsFirstName;
}

/**
* models last name
*/
public void setLastName(String whatIsLastName)
{
lastName = whatIsLastName;
}

/**
* models height in inches
*/
public void setHeightInInches(int whatIsHeight)
{
if (whatIsHeight >0){
heightInInches = whatIsHeight;
}

}

/**
* models weight in pounds
*/
public void setWeightInPounds(double whatIsWeight)
{
if (whatIsWeight >0){
weightInPounds = whatIsWeight;
}
}

/**
* can model travel
*/
public void setTravel(boolean canTravel)
{
travel = canTravel;
}

/**
* does model smoke
*/
public void setSmokes(boolean smoker)
{
smokes = smoker;
}

/**
* Converts to feet and inches
*/
public String convertheightToFeetInches()
{
int leftOver = (heightInInches %= IN_PER_FOOT);
int newHeight = (heightInInches % IN_PER_FOOT);
return newHeight + "Foot" + leftOver + "Inches";
}

/**
*
*/
public int calculatePayPerHour(){
if (heightInInches >= TALL_INCHES && (weightInPounds <= THIN_POUNDS)) {
perHourRate = BASE_RATE + TALL_THIN_BONUS;
return perHourRate;
}
else
{
perHourRate = BASE_RATE;
return perHourRate;
}

if (travel) { //unreachable statement


perHourRate = BASE_RATE + TRAVEL_BONUS;
return perHourRate;
}
else
{
perHourRate = BASE_RATE;
return perHourRate;

}

if (smokes) { //unreachable statement
perHourRate = BASE_RATE - SMOKER_DEDUCTION;
return perHourRate;
}

else {}

}






/**
* Displays details
*/
public void displayInfo()
{
System.out.print("Name : " + getFirstName() + " ");
System.out.println(getLastName());
System.out.println("Height : " + getNewHeight() + "inches");
System.out.println("Weight : " + getWeightInPounds() + "pounds");
System.out.print("Travel : " + getTravel() + " " );
System.out.print("Smokes : " + getSmokes() );
System.out.println("Hourly rate : " + getPerHourRate() );
}

}

最佳答案

这是因为您的程序将从第一个 if block 或相应的 else block 返回:-

if (heightInInches  >= TALL_INCHES && (weightInPounds <= THIN_POUNDS)) {
perHourRate = BASE_RATE + TALL_THIN_BONUS;
return perHourRate;
}
else
{
perHourRate = BASE_RATE;
return perHourRate;
}
System.out.println("This will never get printed. And will show compiler error");

因此,两个 return 语句中的任何一个都会被执行。因此任何进一步的代码都是无法访问的。

<小时/>

似乎您想要将所有服务费率累加起来以获得最终的perHourRate,为此,您可以删除return语句 code> 来自每个 if-else block 。然后,对于第一个 block 之后的所有 if-else block ,不要将 当前价格 分配给 perHourRate,而是执行一个 compound加法 +=

此外,由于您正在处理实例字段 - perHourRate,因此您根本不需要返回它。您可以使用 getPerHourRate() 获取对 perHourRate 所做的更改。因此,将返回类型更改为 void

您可以尝试将您的 calculatePayPerHour 方法更新为以下方法:

public void calculatePayPerHour(){
if (heightInInches >= TALL_INCHES && (weightInPounds <= THIN_POUNDS)) {
perHourRate = BASE_RATE + TALL_THIN_BONUS; // Initial assignment

} else {
perHourRate = BASE_RATE; // Initial assignment
}

/** Rest of the assignment will be compound assignment, since you
are now updating the `perHourRate` **/

if (travel) {
perHourRate += TRAVEL_BONUS;
} // You don't need an else now. Since BASE_RATE is already added

if (smokes) {
perHourRate -= SMOKER_DEDUCTION;
}
}

关于java - 为什么这是一个无法访问的语句?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14768361/

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