How to remove specific element from an array [duplicate]

Answer 1

char[] finishedArray = new char[0];
char[] arrayToCheck = new char[]{ 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
for( int i = 0; i < arrayToCheck.length; i++ )
{
    if( !doesNOTMeetSomeCondition( arrayToCheck[ i ] ) )
    {
        //DOES meet keep condition, add to new array
        char[] newCharArray = new char[ finishedArray.length + 1 ];
        for( int j = 0; j < finishedArray.length; j++ )
        {
            newCharArray[ j ] = finishedArray[ j ];
        }
        newCharArray[ finishedArray.length ] = arrayToCheck[ i ];
        finishedArray = newCharArray;
    }
}
//finishedArray contains desired result

A list would be much more fitting tool if you can change the data structure and are comfortable using Strings to contain the chars.

List<String> finishedList = Arrays.asList( 'a', 'b', 'c', 'd', 'e', 'f', 'g' );
for( String charInList : finishedList )
{
    if( doesNOTMeetSomeCondition( charInList.toCharArray()[ 0 ] ) )
    {
        finishedList.remove( charInList );
    }
}
//finishedList contains the desired result

Answer 2

It'd probably be a better idea to use a switch statement here. Rather than eliminating the character that you don't want from your array (mutation during iteration is evil unless you're using an Iterator), why don't you use the StringBuilder class to catch all the characters you do want?

Answer 3

You wont really be able to delete the element but you could change it by doing something like b[i] = 0; at the end of the given code. Arrays are a certain length and the length cant be changed so if you want to remove that part of the array i would suggest using a list instead.

List temp = b.asList();
Iterator it = temp.iterator();
while(it.hasNext())
{
    if(it.next() == "t")  //your modification code here
        it.remove();
}
char[] newB = temp.toArray();

Something like this would work for you i think.

Answer 4

This should do what you want:

ArrayList<char> charList = new ArrayList<char>(0);

for (int i= 0; i < b.length; i++) {
    if (b[i] == condition) {
        charList.Add(b[i]);
    }
}

charList.toArray();

Answer 5

Because comments don't allow good code formatting:

At the beginning of your code, you get the String contents as a char[] and immediately lose it again by assigning a new char[] of the same size to the variable.

char[] b = inputString.toCharArray();
b = new char[b.length];

so the loop after works on a default-initialized array, not on the string contents. You need two array references to do the copying.

Answer 6

Something is not right with your program:

String s;
char[] b = inputString.toCharArray();
b = new char[b.length];
do {
    if(!(b[i]>='0')&&(b[i]<='9')&&(b[i]!='.')) {
        ...
    }
} while...

You're creating a char[] from your inputString, and then on the next line you assign a whole new empty char[] in your b variable. b[i] will in fact never be equals to 0, 9 or i. Did you put that line here by error?

Then for the removing thing, I'd suggest too the use of an ArrayList where you will be able to iterate over it and remove the specific index you want to remove very easily.