如何在Java中自动增加数组的大小

Question

How the array size is auto increment in java program my requirement is "create a 2 dimensional array sno, in the first dimension name, age in the second dimension so if i pass sds, 25 it should be added to the array [0][sds,25] the array should keep incrementing" my code is like this:

void values() throws IOException{for ( int row = i; row < len; row++ ){
            for ( int column = 1; column <= 1; column++ ){
                arrayValues[row][0] = String.valueOf(row+1);
                System.out.print("Enter "+(row+1)+" Name: ");
                String name = br.readLine();
                System.out.print("Enter "+(row+1)+" age: ");
                int age = Integer.parseInt(br.readLine());
                arrayValues[row][column]= name+","+age;
            }
void incrementSize() throws IOException{String[][] newArray = new String[arrayValues.length][];
    System.out.println(newArray.length);
String[][] t = Arrays.copyOf(arrayValues, newArray.length);

After this how can done my code Please help me

Answer 1

I think the perfect bet of your requirement is ArrayList .

Resizable-array implementation of the List interface.

Answer 2

Use List for this requirement. You can use a ArrayList<ArrayList> in place of 2-dim array. ArrayList is Resizable-array implementation of the List interface.

An array is a container object that holds a fixed number of values of a single type.

Answer 3

You have to create a new array in order to make the size bigger, there is no dynamic way to increase an existing array.

Here is a way you can create a new array to increase the size.

int[] a = new int[5];
// fill a
int[] b = Arrays.copyOf(a, 10);

Answer 4

Sounds like you are looking a dynamically growing data structure. you can use implementation of list interface which is in java collection frame work. you can use ArrayList or Vectors.

Answer 5

Using java.util.Arrays class it is possible. Please refer below link for answer.

How to increase string array size automatically or dynamically