difference between delete and delete[ ]

 Whenever you allocate memory with 'new[]', you have to free the memory using 'delete[]'. When you allocate memory with 'new', then use 'delete' without the brackets. You use 'new[]' to allocate an array of values (always starting at the index 0).


int *pi = new int; // allocates a single integer
int *pi_array = new int[10]; // allocates an array of 10 integers

delete pi;
pi = 0;
delete [] pi_array;
pi_array = 0;

Are you sure you're referring to Java here rather than C++?

In C++, delete is used to remove an object from memory which was created using new and delete[] is used to remove an array object which was created using new[].