Arrays

An array holds a fixed number of values of the same type, indexed from 0.

int[] scores = {90, 85, 77};
System.out.println(scores[0]);     // 90
System.out.println(scores.length);  // 3 (a field, not a method)

scores[1] = 88;

Common mistakes

• Calling scores.length() like a method — for arrays, length is a field with no parentheses (String's .length() is a method — the two are easy to mix up).
• Accessing an index equal to or beyond length — throws ArrayIndexOutOfBoundsException immediately, with no silent undefined-style fallback.
• Needing to grow or shrink a collection — arrays are fixed-size; use an ArrayList instead (see Collections Basics below).