WriteLoops.java

//import com.sun.org.apache.xpath.internal.SourceTree;

import java.awt.SystemTray;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Supplier;

/**
 * Writeloops get you thinking about how to do different things with loops.
 *
 * @author anonymous coward
 * @version -0.3
 * 
 */
public class WriteLoops {

    private static final int _3 = 3;

    public int oneToFive() {
        int w = 0;
        // Write a FOR loop that counts from 1 to 10.
        for(int i = 1; i <= 5; i++){
            // calling
            w = w + 1;
            // each time through the loop
        }
        // this will tell the test how many times the loop executed.
        return w;

    }

    public int oneToTen() {
        int w = 0;
        // Write a FOR loop that counts from 1 to 10.
        for(int i = 1; i <= 10; i++){
            // calling
            w = w + 1;
            // each time through the loop
        }
        return w;

    }

    public int startAtTwentyOne() {
        int w = 0;

        // Write a FOR loop that makes 10 iterations, start at 21.
        for(int i = 21; i <= 31; i++){
            // calling
            w = w + 1;
            // each time through the loop
        }
        return w;
    }

    public int countDown() {
        int w = 0;

        // Write a FOR loop that counts down from 100 to 0.
        for(int i = 100; i > 0; i--){
            w = w + 1;
        }
        return w;
    }

    public int byTwoTo32() {
        int w = 0;

        // Write a FOR loop from 0 to 32 by 2s.
        for(int i = 0; i <= 32; i+=2){
            w = w + 1;
        }
        System.out.println(w);
        return w;
    }

    public int countDownFrom5000() {
        int w = 0;

        // Write a FOR loop from 1 to less than 5001 by 11s.
        for(int i = 1; i <= 5001; i+=11){
            w = w + 1;
        }
        return w;
    }

    public int nestedFors() {
        int w = 0;

        // Write a nested FOR loop(s), where one counts from
        // 0 to less than 20 and the inner one counts from 0 to 4
        for(int i = 0; i < 20;i++){
            for(int j = 0; j <= 4;j++){
                w = w + 1;
            }
        }
        return w;
    }

    public int helloZipCode() {
        int w = 0;

        // Write a FOR loop that counts from 5 to 105. Put an IF
        // statement inside the loop that checks the
        // loop index counter and if it’s greater than 51,
        // prints “Hello Zipcode” instead of the statement w = w + 1;
        for(int i = 5; i <= 105;i++){
            if(i > 51){
                System.out.println("Hello Zipcode");
            } else {
                w = w + 1;
            }

        }
        return w;
    }

    public void simpleLoops() {
        int i = 0;

        // sample while loop
        while (i <= 5) {
            System.out.println("Eww.");
            i = i + 1;
        }

        // sample do...while loop
        i = 8;
        do {
            System.out.println("Eww.");
            i = i - 1;
        } while (i > 0);
        // what's the primary difference between them?!?
    }

    // Write a WHILE loop that checks “gpsCurrentLocation()”
    // and if that is not equal to “Home” then and it calls “driveSomeMore()”.
    // After the loop is done, print “Honey, I’m Home!”
    public int driveHome() {
        int w = 0;

        // you need to use a .equals for two Strings.
        while(!gpsCurrentLocation().equals("Home")){
            driveSomeMore();
            w = w + 1;
        }
        System.out.println("Honey, I'm Home!");
        return w;

    }
    // Getting harder...
    // First declare and set “highestScore” to 236. Then set “currentScore” to
    // “gameNextScore()”. Then write a WHILE loop that checks "runningScore"
    // is less than “highestScore” and if it is, adds “currentScore” to
    // "runningScore"
    // and then sets “currentScore” to “gameNextScore()”
    public int checkGameScore() {
        int w = 0;
        int highestScore = 236;
        int currentScore = gameNextScore();
        int runningScore = 0;

        // do your while loop here
        while(runningScore < highestScore){
            w = w + 1;
            runningScore += currentScore;
            currentScore = gameNextScore();
        }
        return w; // >= 3;
    }

    // Rewrite the previous WHILE loop as a DO..WHILE loop.
    // Notice how the “runningScore” variable usage is different.
    public boolean checkGameScoreDoWhile() {
        int w = 0;
        int highestScore = 236;
        int currentScore = gameNextScore();
        int runningScore = 0;

        // do your while loop here
        do
        {w = w + 1;
            runningScore += currentScore;
        }while(runningScore < highestScore);

        return w <= 5;
    }

    // Write a WHILE loop that checks “serverIsRunning()” and if true
    // calls “waitFor(5)” After the loop, write an IF and check “serverIsRunning()”
    // is false, and if so, call “sendEmergencyText(“Help!”, adminPhoneNumber)”
    // and also calls “tryServerRestart()”
    public int checkServerStatus() {
        int w = 0;
        int serverStatus = 5;
        String adminPhoneNumber = "+1 202 456 1111";
        while(serverIsRunning()){
            waitFor(5);
            w = w + 1;
        }
        if(!serverIsRunning()){
            sendEmergencyText("Help!",adminPhoneNumber);
            tryServerRestart("Attempting to relaunch","+1 202 456 1111");
        }

        return w;
    }

    // Declare an “int” i. Set i to 7.
    // Write a WHILE loop that checks “i” is less than 50,
    // and if it is, add 7 to “i”
    public int loop50by7() {
        int w = 0;
        int i = 7;
        while(i < 50){
            i += 7;
            // calling
            w = w + 1;
            // each time through the inner loop
        }
        return w;
    }

    int[] threes_array = { 3, 6, 9, 12, 15, 18, 21 };

    // Foo is method that add the first 7 factors of three together and prints
    // out the sum of them all.
    public int foo() {
        int w = 0;
        // this is an array of ints. it is of length 7 (from 0 -> 6)
        int sumOfThrees = 0;

        // this is a so called Enhanced for loop
        for (int index : threes_array) {
            sumOfThrees = sumOfThrees + threes_array[index];
            // calling
            w = w + 1;
            // each time through the inner loop
        }
        System.out.print("The Sum is ");
        System.out.println(sumOfThrees);

        return w;
    }

    // Ponder this: can all FOR loops be rewritten as WHILE loops?
    // rewrite the loop inside of "foo()" as a standard for loop
    // with 'i' as its index variable.
    public int rewriteFooAsFor() {
        int w = 0;
        int sumOfThrees = 0;
        int i = 0;
        while(i <= 6){
            // calling
            sumOfThrees = sumOfThrees + threes_array[i];
            w = w + 1;
            i++;
        }
        // each time through the inner loop

        System.out.print("The Sum is ");
        System.out.println(sumOfThrees);

        return w;
    }

    // Ponder this: can all WHILE loops be rewritten as FOR loops?
    // rewrite the loop inside of "foo()" as a 'while' loop
    public int rewriteFooAsWhile() {
        int w = 0;
        int sumOfThrees = 0;
        for(int i = 0; i <=6;i++){
            sumOfThrees = sumOfThrees + threes_array[i];
            w = w + 1;
        }
        System.out.print("The Sum is ");
        System.out.println(sumOfThrees);

        return w;
    }

    // Declare a boolean “yardNeedsMowed” and initialize to true.
    // Write WHILE loop that checks for “isSummer()”.
    // inside the loop, write an IF that checks “yardNeedsMowed” and if true calls
    // “yellAtJuniorToMowLawn()”
    // After loop, call
    // “sendJuniorBackToSchool()” with an argument that decribes the day junior goes
    // back.
    public int manageYardAndJunior() {
        int w = 0;
        boolean onTime = true;
        boolean yardNeedsMoved = true;
        String firstDayOfSchool = "";

        while(isSummer()){
            if(yardNeedsMoved){
                yellAtJuniorToMowLawn();
            }
            w = w + 1;
        }
        sendJuniorBackToSchool(firstDayOfSchool);

        return w;
    }

    String voteTallies[] = { "Lincoln", "Washington", "Adams", "Lincoln", "Washington", "Adams", "Lincoln",
            "Washington", "Adams", "Lincoln", "Washington", "Adams", "Roosevelt" };

    // Given an array voteTallies[], write a FOR loop that prints out each value in
    // the array.
    public int tallyVote1() {
        int w = 0;
        int numberOfVotes = voteTallies.length;
        for(int i = 0; i < numberOfVotes;i++){
            w = w + 1;
            System.out.println(voteTallies[i]);
        }      
        return w;
    }

    // Given an array voteTallies[], write a WHILE loop that prints out each value
    // in the array. You should declare and use an index “idx” to keep track of
    // where you are.
    public int tallyVote2() {
        int w = 0;
        int numberOfVotes = voteTallies.length;
        int idx = 0;
        while(idx < numberOfVotes){
            w = w + 1;
            idx++;
            System.out.println(voteTallies[idx]);
        }
            return w;
    }
        /**
         * CONGRATS, you've written all the code. Does it all pass their tests?!?
         * 
         * 
         * If not, why not? :-)
         * 
         * 
         */

        /**
         * IGNORE the CODER behind the CURTAIN. These are the support routines to make
         * all the examples interesting.
         */
        // instance variables - replace the example below with your own
        private int x;

        /**
         * Constructor for objects of class WriteLoops
         */
        public WriteLoops() {
            // initialise instance variables
            x = 0;
        }

        private int gps = 0;

        private String gpsCurrentLocation() {
            if (this.gps > 5) {
                return "Home";
            }
            return "Not Home";
        }

        private void driveSomeMore() {
            this.gps += 1;
        }

        private int scr = 31;

        private int gameNextScore() {
            return this.scr = this.scr + ThreadLocalRandom.current().nextInt(20, 99 + 1);
        }

        private void yellAtJuniorToMowLawn() {
            /* dammit, mow the yard */}

        private void sendJuniorBackToSchool(String timeForSchool) {
        if (!timeForSchool.equalsIgnoreCase("First Day of School")) {
            throw new IllegalArgumentException();
        }
        /* dammit, mow the yard */}

    // private Supplier<Boolean> isSummer = () -> {
    //     int i = 0;
    //     return Supplier<Boolean> () -> {
    //         i = i + 1;
    //         return (i >= 3);
    //     };
    // };
    private int summer = 0;
    private boolean isSummer() {
        if (summer == 3) {
            return true;
        }
        summer++;
        return false;
    }

    private void sendEmergencyText(String mesg, String phone) {
    }

    private void tryServerRestart(String mesg, String phone) {

    }

    int serverStatus = 5;

    private boolean serverIsRunning() {
        return (serverStatus < 20);
    }

    private void waitFor(int interval) {
        serverStatus += interval;
    }

}