Java Built-in Arrays - University of San Francisco
[Pages:2]CS 110: Introduction to Computer Science
Spring 2008
Java Built-in Arrays
Besides collection classes like ArrayList, Java also has a built-in array construct that is similar to a Python list.
Example
int array[]; // declare an array with elements of type int array = new int[10]; // allocate space for 10 elements on heap array[0]=3; // set the 0th element to 3.
Note that you must both declare the array and allocate the elements for it. As with creating objects, you can do this on one line:
int array[]= new int[7];
Arrays are error-prone
Once you set the size it's fixed. So
array[10]=4;
for the example above will give a run-time error.
There is no way to increase the size of an array once you've created it, no append.
Array Iteration
To find the length of an array, use array data member 'length'. `length' gives the number of elements allocated, not the number inserted.
So here's a loop:
int i=0; while (i ................
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