Espresso: A Concentrated Introduction to Java

Short Reference on Arrays

Array Declaration

Type[] name

E.g., int[] grades

E.g., String[] names

Array Construction

new Type[size]

E.g., grades = new int[5];

E.g., names = new String[num_students + num_faculty];

Array Initialization During Construction

new Type[] { v0, v1, ..., vn };

E.g., new int[] { 5, 3, 1 }

E.g., new String[] { "Hello", "Goodbye" }

E.g., new Fraction[] { new Fraction("1/3"), new Fraction(a,b) };

Array Length

name.length

E.g., pen.println("I have recorded " + grades.length + " grades for you.");

Getting a value

name[index]

E.g., pen.println(names[i]);

Setting a value

name[index] = newvalue

E.g.,. grades[i] = 100;

History

Saturday, 5 March 2005

• Created.