CODEWITHSUNDEEP
javaarrays
eager2learn
eager2learn

Reputation: 1488

Using arrays as elements of arrays

I have a problem with the method "update()" in the following code. I tried to to use arrays as elements of the array "hyp", since the individual arrays do not all have the same size. Now in the update function I want to compare the elements that are stored in position 0 of the individual arrays, e.g. sky[0], in the j-th position of hyp with the corresponding elements in the trainingexample array. The problem I have is that I can only access the address for each array in the j-th position of the hyp array. I tried to assign the array in the j-th position, i.e. hyp[j], to a variable of type Object[], but this did not work. Should I just use multidimensional arrays, even though there would be empty elements in it or is there a better solution than what I'm trying to do here?

public class FindS {
static Object[] sky = {"Sunny", "Cloudy", "?", "0", 0};
static Object[] airtemp = {"Warm", "Cold", "?", "0", 0};
static Object[] humidity = {"normal", "high", "?", "0", 0};
static Object[] wind = {"strong", "weak","?", "0",0};
static Object[] water = {"warm", "cold","?", "0", 0};
static Object[] forecast = {"same", "change","?", "0", 0};

static Object[] hyp = {sky,airtemp,humidity,wind, water, forecast};


public static String[] trainingexample = new String[7];


public static int findindex(Object[] a, String s){
    int index = 0;
    while (index != a.length - 1){
        if (a[index] == s)
            return index;
        index++;
    }
    return -1;

}

public static void exchange(Object[] a, String s){
    int exchindex = findindex(a, s);
    try{
        Object temp = a[exchindex];
        a[exchindex] = a[0];
        a[0] = temp;
    } catch (ArrayIndexOutOfBoundsException e)
    {
        System.out.println(s + "not found");
    }
}

public void update(){
    if (trainingexample[6] == "0");
    else{
        int j = 0;
        while ( j != hyp.length){
            Object[] temp = hyp[j];
            if (temp[0] == trainingexample[j]);

        }
    }
}

Upvotes: 1

Views: 74

Answers (2)

rgettman
rgettman

Reputation: 178263

It would be best to define hyp as a multidimensional array.

static Object[][] hyp = {sky,airtemp,humidity,wind, water, forecast};

Then your assignment would work:

Object[] temp = hyp[j];

Alternatively, but less clearly, you could just cast hyp[j] as Object[], but I wouldn't recommend it.

Object[] temp = (Object[]) hyp[j];

Upvotes: 2

Kick
Kick

Reputation: 4923

The hyp at particular index j will return Object. 

static Object[] hyp = {sky,airtemp,humidity,wind, water, forecast};

So change Object[] temp = hyp[j]; to Object temp = hyp[j];

Upvotes: 0

Related Questions