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Math
Method |
Description |
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Random Method |
Description |
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Math.abs(value) |
absolute value |
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nextInt(max) |
random integer from 0 to max-1 |
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Math.min(v1, v2) |
smaller of two values |
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Construction
Examples |
|
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Math.max(v1,
v2) |
larger of two values |
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int[] data = new int[10]; |
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Math.round(value) |
nearest whole number |
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Random r = new Random(); |
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Math.pow(b,
e) |
b to the e power |
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Types:
ArrayList<String>, ArrayList<Integer> |
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String Method |
Description |
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contains(str) |
true if this string contains the other's characters inside it |
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endsWith(str), startsWith(str) |
true if this string starts/ends with the
other's characters |
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equals(str) |
true if this string is the same as str |
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equalsIgnoreCase(str) |
true if this string is the same as str, ignoring capitalization |
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indexOf(str) |
index in this string where given string begins (-1 if
not found) |
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length() |
number of characters in this string |
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substring(i, j) |
characters in this string from index i (inclusive) to j (exclusive) |
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toLowerCase(), toUpperCase() |
a new string with all lowercase or uppercase letters |
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charAt(i) |
returns char at index i |
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Scanner
Method |
Description |
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nextInt(), hasNextInt() |
read/return token as int and test if reading will succeed |
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next(), hasNext() |
read/return token as String and test if reading will succeed |
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nextDouble(), hasNextDouble() |
read/return token as double and test if reading will succeed |
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nextLine(), hasNextLine() |
read/return line as String and test if reading will succeed |
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ArrayList
Method |
Description |
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add(value) |
appends value at end of list |
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add(index, value) |
inserts given value at given index, shifting subsequent
values right |
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clear() |
removes all elements of the list |
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get(index) |
returns the value at given index |
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remove(index) |
removes/returns value at given index, shifting
subsequent values left |
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set(index, value) |
replaces value at given index with given value |
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size() |
returns the number of elements in list |
public class name extends Critter {
fields/constructor
public Color getColor() {
statement(s) that return a Color (e.g., Color.RED, Color.BLUE, Color.GREEN)
}
public Action getMove(CritterInfo info) {
statement(s) that return Action.INFECT, Action.HOP, Action.RIGHT, or Action.LEFT
}
public String toString() {
statement(s) that return a String;
}
}
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CritterInfo
Method |
Description |
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getFront(), getBack(), getLeft(), getRight() |
returns one of Neighbor.WALL, Neighbor.EMPTY, Neighbor.SAME, Neighbor.OTHER |
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getDirection() |
returns one of Direction.NORTH, Direction.SOUTH, Direction.EAST, Direction.WEST |