how to add in array in java code example

Example 1: how to add elements in string array in java

Arrays in Java have a defined size, you cannot change it later by adding or removing elements (you can read some basics here). Instead, use a List : ArrayList<String> mylist = new ArrayList<String>(); mylist. add(mystring); //this adds an element to the list.

Example 2: java array add element

// A better solution would be to use an ArrayList which can grow as you need it. 
// The method ArrayList.toArray( T[] a ) 
// gives you back your array if you need it in this form.

List<String> where = new ArrayList<String>();
where.add(element);
where.add(element);

// If you need to convert it to a simple array...

String[] simpleArray = new String[ where.size() ];
where.toArray( simpleArray );

Example 3: java add element to existing array

//original array
String[] rgb = new String[] {"red", "green"};
//new array with one more length
String[] rgb2 = new String[rgb.length + 1];
//copy the old in the new array
System.arraycopy(rgb, 0, rgb2, 0, rgb.length);
//add element to new array
rgb2[rgb.length] = "blue";
//optional: set old array to new array
rgb = rgb2;

Example 4: how to add a number to an array in java

List<Integer> myList = new ArrayList<Integer>();
myList.add(5);
myList.add(7);

Example 5: how to add to an array

var ar = ['one', 'two', 'three'];
ar[3] = 'four'; // add new element to ar