Java Array Compiler

Examples included

• Run the array declare example
• Run the array max example
• Run the array reverse example
• Run the array sort example
• Run the array 2d example
• Run the binary search example
• Run the array sum avg example
• Run the remove duplicates example

Practical tips

• Use Arrays.toString(arr) to print arrays — direct printing shows hash codes.
• For 2D arrays, matrix.length is the number of rows; matrix[0].length is columns.
• Arrays.sort() is in-place. To get a sorted copy, clone first: int[] sorted = arr.clone(); Arrays.sort(sorted).
• Java arrays have a fixed size. For dynamic resizing use ArrayList.

Common questions

How do I declare an array in Java?

Use int[] arr = {1,2,3} for literal arrays, or int[] arr = new int[5] for a sized empty array.

How do I read an array from input?

Read the size with Scanner.nextInt(), then loop nextInt() to fill the array. See the "Read Array from Input" example.

Can I run 2D array programs in this compiler?

Yes. The 2D array example shows iteration over rows and columns and runs in your browser.