How to assign value of an array variable into another array variable

Question

String[] msgoptions;
String[] finalmsgs3 = finalmsgs2[3].split("RR");
for(i = 1; i < finalmsgs3.length; i++)
{
    msgoptions[i] = finalmsgs3[i];
    Log.e(TAG, "---------------" + msgoptions[i]);
}

I need your help, if you can resolve issues of my code. Actually i'm trying to assign values of an array variable to another array variable. but i can't do that because got some errors. So, Could you any one help me..?

Answer 1

您需要在使用之前初始化数组msgoptions ，例如：

String[] msgoptions = new String[SIZE];

Answer 2

Rewrite your code to:

String[] finalmsgs3 = finalmsgs2[3].split("RR");     // switch first two lines
String[] msgoptions = new String[finalmsgs3.length]; // initilize the other array
for(i = 0; i < finalmsgs3.length; i++)               // Array index starts at 0
{
    msgoptions[i] = finalmsgs3[i];
    Log.e(TAG, "---------------" + msgoptions[i]);
}

A better solution would be:

String[] finalmsgs3 = finalmsgs2[3].split("RR");
String[] msgoptions = Arrays.copyOf(finalmsgs3, finalmsgs3.length);

Answer 3

Try that :

String[] msgoptions = = new String[SIZE];;
String[] finalmsgs3 = finalmsgs2[3].split("RR");
int j=0;
for(i = 0; i < finalmsgs3.length; i++)
{
    msgoptions[j] = finalmsgs3[i];
    j++;
    Log.e(TAG, "---------------" + msgoptions[i]);
}

Answer 4

First, on Java, you need to initialize your arrays. Also please note that they are based on 0 indexes.

So you should change your code to something like this:

String[] finalmsgs3 = finalmsgs2[3].split("RR");
String[] msgoptions = new String[finalmsgs3.length];
for(int i = 0; i < finalmsgs3.length; i++)
{
    msgoptions[i] = finalmsgs3[i];
    Log.e(TAG, "---------------" + msgoptions[i]);
}

But to do array copying you can avoid your code for using something more "standard" like java.util.Arrays.copyOf(T[] original, int newLength)