Java Arrays | |||
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Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value. To declare an array, define the variable type with square brackets:
We have now declared a variable that holds an array of strings. To insert values to it, you can place the values in a comma-separated list, inside curly braces:
To create an array of integers, you could write:
Access the Elements of an Array You can access an array element by referring to the index number. This statement accesses the value of the first element in cars:
Change an Array Element To change the value of a specific element, refer to the index number: Example 1)
Example 2)
Array Length To find out how many elements an array has, use the
Loop Through an Array You can loop through the array elements with the The following example outputs all elements in the cars array:
Loop Through an Array with For-Each There is also a "for-each" loop, which is used exclusively to loop through elements in arrays:
The following example outputs all elements in the cars array, using a "for-each" loop:
The example above can be read like this: for each If you compare the Multidimensional Arrays A multidimensional array is an array of arrays. Multidimensional arrays are useful when you want to store data as a tabular form, like a table with rows and columns. To create a two-dimensional array, add each array within its own set of curly braces:
myNumbers is now an array with two arrays as its elements. Access Elements To access the elements of the myNumbers array, specify two indexes: one for the array, and one for the element inside that array. This example accesses the third element (2) in the second array (1) of myNumbers:
Change Element Values You can also change the value of an element:
Loop Through a Multi-Dimensional Array We can also use a
Below YouTube content is also helpful for better understanding: Tags: Array Array Element Array Length Java Array Multi-Dimensional Array | |||
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