java编程死代码

Question

I just need someone to tell me why index++ is a dead code so I can try to fix it myself.

heres my code for one class

public class ManagementCompany {
    private String name;
    private String taxID;
    private Property[] properties;
    private double mgmFeePer;
    private final int MAX_PROPERTY = 5;

    public ManagementCompany(String name, String taxID, double mgmFee)
    {
        properties = new Property[MAX_PROPERTY];
        this.name = name;
        this.taxID = taxID;
        this.mgmFeePer = mgmFee;
    }

    public int getMAX_PROPERTY()
    {
        return MAX_PROPERTY;
    }
    public int addProperty(Property property)
    {
        for(int index = 0; index < properties.length; index++)
        {
            properties[index] = property;
                return (index + 1);
        }
        return -1;
    }

heres my other class. Not sure if it's needed though

Answer 1

You have a return in the loop. By unrolling the for you will see why it is dead code:

FOR INITIALIZATION: int index = 0;
FOR PRE-LOOP CHECK: index < properties.length

FOR BODY EXECUTION: properties[index] = property;
                    return (index + 1);

FOR POST-LOOP UPDATE: index++

As you can see, the return makes the loop terminate and exit the for() statement and the enclosing method. This premature termination of the loop is the cause that execution can never reach the post-loop update index++ .

EDIT : I've left this answer incompleted for several hours because the server went under maintenance while I was writing.