CS 145 Lecture 7
September 30, 2011 by Chris Johnson. Filed under
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cs145, fall 2011, lectures.
Topics Covered
- what does this do?
- generating a random spelunking workout
- for loop = while loop, but more compact
- sum numbers 1 to n
- an acrostic editor
- mouse trails
What does this do?
-
public static String ?(??) {
return text + " :)";
}
-
public static ? ??(String text) {
return text.length() == 0;
}
-
public static ? ??(String text) {
int index = text.indexOf('.');
return text.substring(0, index + 1);
}
Code
SpelunkingFitnessDisplay.java
package lecture;
import java.util.Random;
public class SpelunkingFitnessDisplay {
public static void main(String[] args) {
// int i = 0;
// while (i < 13) {
// printLine();
//// i = i + 1;
// ++i;
// }
for (int i = 0; i < 13; ++i) {
printLine();
}
}
public static void printLine() {
Random generator = new Random();
int nDots = generator.nextInt(11);
while (nDots > 0) {
System.out.print("*");
nDots = nDots - 1;
}
System.out.println();
}
}
AcrosticWriter.java
package lecture;
import java.util.Scanner;
public class AcrosticWriter {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.print("Theme: ");
String theme = in.nextLine();
// grab letter i
// prompt for word that starts with i^th letter
// grab letter i + 1
// prompt for word that starts with (i+1)^th letter
int themeLength = theme.length();
for (int i = 0; i < themeLength; ++i) {
char letter = theme.charAt(i);
System.out.print(letter);
in.nextLine();
}
}
public static int sum(int n) {
return 1 + 2 + 3 + 4 + ... + n;
}
}
TODO
- Read sections 3.1 through 3.3 again.
Haiku
Never lose it again!
Install the new Lonely Phone!
while (noOneNear) beep