What is the difference between composition and aggregation?

java ooad
ariso picture ariso · May 1, 2009 · Viewed 24.1k times · Source

What is the difference between composition and aggregation? can anybody give me a sample of this OOAD?

Answer

chaos picture chaos · May 1, 2009

Consider a student, the student's brain, and the school the student attends.

The brain is a part of the student. If the student is destroyed, so is the brain. This is composition.

The student has a school. The student survives the school's destruction, and vice versa. This is aggregation.

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