CS 145 Lecture 17 – Arrays
November 7, 2011 by Chris Johnson. Filed under
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cs145, fall 2011, lectures.
Agenda
- arrays in life
- writing a fill method
- writing a raffle
- state/capital lookup
Code
Fill.java
package lecture;
public class Fill {
public static void main(String[] args) {
double[] series = fill(12, 54, 10);
for (int i = 0; i < series.length; ++i) {
System.out.println(series[i]);
}
}
/**
* Create a list of length items, whose first item is first, whose second item
* is second, and whose remaining elements ...
*
* @param first First value
* @param second Second value
* @param length Number of items in list
* @return List of items following specified pattern
*/
public static double[] fill(double first,
double second,
int length) {
double diff = second - first;
double[] nums = new double[length];
for (int i = 0; i < length; ++i) {
nums[i] = first + i * diff;
}
return nums;
}
}
Raffle.java
package lecture;
import java.util.Random;
import java.util.Scanner;
public class Raffle {
public static void main(String[] args) {
String[] names = new String[10];
int i = 0;
Scanner in = new Scanner(System.in);
System.out.print("> ");
while (in.hasNextLine() && i < 10) {
names[i] = in.nextLine();
++i;
System.out.print("> ");
}
Random generator = new Random();
int iWinner = generator.nextInt(i);
System.out.println(names[iWinner]);
}
}
TODO
- Start preassignment 3.
- Read section 7.2.
Haiku
so cute, Lu and Ray
then Lu just stopped coming ’round
conditional love