此方法必须返回int类型的结果 -

Question

除了getPrice()我返回的最后一个方法之外,一切都工作得很好,int但我一直得到同样的错误.此外,如果我将保修设为假,它仍然返回(基数+((基数/ 100)*10))

public class Machinery extends SaleGroup {

private float serial;
public int base;
private static boolean hasWarranty;

public Machinery(String newItemDescription, float newProductCode,
        float newSerial, int newBasePrice) {

    super(newItemDescription, newProductCode);
    serial = newSerial;
    base = newBasePrice;

}

public boolean IncludeWarranty() {
    return hasWarranty=true;
}

public boolean ExcludeWarranty() {
    return hasWarranty=false;
}

public float getSerial() {
    return serial;
}



public int getPrice()
    {
        if (hasWarranty==true)
        {
            return (base+((base/100)*10));
        } 
        else if (hasWarranty==false) 
        {
            return base;
        }
    }
}

我有3个类,SaleGroup.java,Machinery.java和MachineryTest.java

public abstract class SaleGroup {

     private String item;
     private float code;

     //Constructor with name and code parameters for specifying 
     //access methods that return the name and code
     public SaleGroup(String newItemDescription, float newProductCode)
     {
          item = newItemDescription;
          code = newProductCode;
     }

     public String getItemDescription() 
     {
          return item;
     }

     public float getProductCode() 
     {
          return code;
     }

     public abstract int getPrice();

     public String toString()
     {
          return "Item " + item + "has product code " + code + " and price is" + getPrice();
     }

}

MachineryTest.java

import javax.swing.JOptionPane;
public class MachineryTest {
    public static void main(String[] args) {
        String newItemDescription = "Item";
        float newSerial = 4234;
        float newProductCode = 3424;
        int newBasePrice = 1000;
        boolean hasWarranty=true;

        Machinery test1 = new Machinery(newItemDescription, newProductCode,
                newSerial, newBasePrice);
        JOptionPane.showMessageDialog(
                null,
                "Item: " + test1.getItemDescription() + " Serial: "
                        + test1.getSerial() + " Code: "
                        + test1.getProductCode() + " Warranty Included: "
                        + hasWarranty + " Price " + test1.getPrice());
    }
}

*更新:*

除了最后一个方法getPrice()之外,一切正常.我返回int但是我一直得到同样的错误.此外,如果我将保修设为假,它仍然返回(基数+((基数/ 100)*10))

Answer 1

如果您的if条件都不成立,则该方法不会返回任何内容.
编译器的可达性分析不够聪明,不能意识到bools必须始终是true或false(特别是因为那不是真的)

您可以通过删除iffrom else子句来解决此问题.
当你在它的时候,你也可以删除那个== true没用的部分.