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KwickClips Java · 42 sec · free

Can a Java array grow after it is created?

Short answer. No. Its size is fixed at creation.

What do you use instead when items keep being added?

An ArrayList.

Limits of arrays

Size fixed at creation
No add or remove method
Shifting done by hand

Remember

Arrays cannot grow
Use ArrayList to grow

Your array holds thirty students. A new one joins. Now what? Arrays cannot grow. Their size is fixed at creation. They have no add or remove method. Inserting means shifting by hand. Arrays cannot grow. An ArrayList can.

This clip is from the full lesson: ArrayList and Collections — 7 minutes, with the tables, the quick answers and the whole lesson in text.

Useful for: Programming All levels Java

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