In Java, arrays have a fixed size once they are created. It is important to check if an array is full before adding any elements to avoid ArrayIndexOutOfBoundsException.

Method 1: Using Array Length

One way to check if an array is full is by comparing the length of the array to the maximum capacity. Here’s an example:

int[] numbers = new int[5];
boolean isFull = numbers.length == 5;

In this example, we have created an array called numbers with a maximum capacity of 5. By checking if numbers.length is equal to 5, we can determine if the array is full.

Method 2: Using a Variable

Another approach is to keep track of the number of filled positions in the array using a separate variable. Here’s an example:

int[] numbers = new int[5];
int count = 0;

// Adding elements to the array
numbers[count++] = 10;
numbers[count++] = 20;
numbers[count++] = 30;
numbers[count++] = 40;

boolean isFull = count == numbers.length;

In this example, we initialize an array called numbers with a capacity of 5 and create a variable count to track the number of elements added to the array. After adding elements to the array, we check if count is equal to numbers.length to determine if the array is full.

Conclusion

Checking if an array is full is an essential step to avoid accessing invalid indices. Whether you choose to compare the array length or use a separate variable, both methods will help you determine if an array is full in Java.

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