CSE 2221 Lecture 9: AppendUndorView1

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brettemory2

7 Dec 2021

School

Ohio State University

Department

Computer Science & Engineering

Course

CSE 2221

Professor

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Document Summary

18 public final class appendundoview1 extends jframe implements. 26 * gui widgets that need to be in scope in actionperformed method, and. 27 * related constants. (each should have its own javadoc comment, but these. 28 * are elided here to keep the code shorter. ) 52 * call the jframe (superclass) constructor with a string parameter to. 53 * name the window in its title bar. 70 * text areas should wrap lines, and outputtext should be read-only. 81 * create scroll panes for the text areas in case text is long enough to. 82 * require scrolling in one or both dimensions. 87 * create a button panel organized using grid layout. 92 * add the buttons to the button panel, from left to right and top to. 99 * organize main window using grid layout. 103 * add scroll panes and button panel to main window, from left to right.

Related Questions

5. Consider the following class: import java.util.Scanner; public class Money private int dollars; private int cents; public Money (int d, int c) { dollars = d; cents = c; /* Point 1 */ public String toString() { String result; if (cents > 100) int totalCents = dollars * 100 + cents; dollars = totalCents / 100; cents = total Cents % 100; /* Point 2 */ /* Point 3 */ result = "$" + dollars + ", " + cents + "C"; return result; public static void main(String[] yourGrandfather) Scanner keyboard - new Scanner (System.in); Money amount; int C; /* Point 4 */ System.out.print("Enter an amount in cents: "); C = keyboard.nextInt (); amount = new Money (c/ 100, CX 100); System.out.println("You have: " + amount.toString()); The above program compiles and runs without error. Which variables are in scope at each of the points marked by comments in the above class? In other words, if each of these comments were replaced by an actual Java statement, which variables could be used in this statement without a prefix (that is, without having to write the name of a class or other variable in front of the variable name) and without the compiler reporting an unknown variable error? List each variable that is in scope at each of the points marked by comments in the above class, and indicate whether it is an instance variable, a formal parameter, or a local variable. Note that you will be penalized for every variable that is out of scope at a given point but that you list as being in scope at that point.

4. In this question, you will be shown a snippet of code. You will then be shown the output from either the compiler or the Java virtual machine and be asked what the error is and how to fix it. In each case, your answer should include the line number of the problem, a one or two sentence explanation as to why the issue occurs, and a specific fix for the problem. Your fix should mention the exact line or lines of code you'd add/change/delete. Total for this question (5 parts): (15 points) (a) Consider the following class: import java.util.Scanner; public class Hockeystandings //This method should calculate the percentage of games in which the team lost. public static double computePercentageLosses (int numwins, int numLosses) return numLosses/ (numwins + numLosses) * 100; public static void main(String[] args) { Scanner reader - new Scanner (System.in); System.out.println("Enter the number of wins for the Maple Leafs"); int numLeafwins = reader.nextInt (); System.out.println("Enter the number of losses for the Maple Leafs"); int numLeaflosses-reader.nextInt (); System.out.println("Enter the number of wins for the Canadiens"); int numCanadienswins – reader.nextInt (); System.out.println("Enter the number of losses for the Canadiens"); int numCanadienslosses = reader.nextInt (); double mapleLeafs Record - computePercentage Losses (numLeafwins, numLeaf Losses); double canadienskecord - computePercentage Losses (numCanadienswins, nuCanadienslos305): if (canadiens Record > mapleleafsRecord) { System.out.println("Of course the Leafs did worse."); else { System.out.println("Wow, that hasn't happened for a long time!"); The point of the program is to ask the user to enter numbers representing the wins and losses of the Maple Leafs and Canadiens in a season. The code compiles successfully and when you run the program, you enter the values: 2 80 40 42 into the keyboard. You expect that the program will output the message Of course the Leafs did worse since they had fewer wins. However, to your surprise, the output of the program is: Wow, that hasn't happened for a long time! Why is this the case and fix the error?

Diffusion Lab

Overview:

In this lab you will investigate how molecules transport in a cell through diffusion and osmosis. You will observe both diffusion and osmosis using an egg and three different substances. You will write a hypothesis, perform an experiment, record observations, collect data, and answer questions after the lab. Below you will find the materials needed for the lab, the procedure for conducting the lab, and a sample layout for your lab notebook page.

Background Information:

The cell membrane surrounds every cell and is the organelle that regulates what moves into and out of a cell. They are selectively permeable which means they only allow certain things to move across the membrane.

Diffusion is the movement of molecules from a high concentration to a low concentration. It is a type of passive transport meaning that it does not require energy from the cell.

Osmosis is the process where water molecules diffuse across the cell membrane from an area of high concentration to an area of low concentration.

For the Lab:

This lab should be done over four consecutive days. You will need to obtain these materials. You should create a lab notebook page to record your hypothesis, observations, and write your conclusions. You can create the notebook page on paper or on a computer.

Materials:

1 raw egg
Container that will hold 2 cups or more (It should be large enough to fully submerge the egg in a liquid)
Tape measure
Vinegar
Corn syrup
Distilled water
Plastic Wrap

Note: Nothing in this lab should harm you, but be careful and ask for help if you need it. Wash your hands every time after you handle the egg and clean your lab area after each day. If you need assistance get adult supervision.

Lab Procedure:

Start by writing a hypothesis to answer the following experiment question: Make sure the hypothesis is in the "if, then" format.

What happens to a raw egg when it is covered first in vinegar, then corn syrup, and then distilled water?

Perform the experiment over 4 consecutive days at about the same time each day. Below you will find instructions for each day:

Day 1:

1. Measure the egg's circumference in centimeters using the tape measure. Record the measurement on the observation table.

2. Record any "before" observations about the egg's appearance (color, shape, texture, size).

3. Carefully place the egg in the container and add vinegar until the egg is fully covered.

4. Cover the container with plastic wrap and leave overnight.

Day 2:

1. Very carefully take the egg out of the vinegar and dry it off.

2. Measure the egg's circumference using the tape measure. Record the measurement on your observation table.

3. Record any "after" observations on your observation table.

4. Clean out the container with soap and water and place the egg back in the container.

5. Add corn syrup until the egg is fully covered. Record any "before" observations on your observation table.

6. Cover with plastic wrap and leave overnight.

Day 3:

1. Repeat steps 1-4 from Day 2 .

2. Add distilled water to the container until the egg is fully covered. Record any "before" observations on your observation table.

3. Cover with plastic wrap and leave overnight.

Day 4:

1. Repeat steps 1-3 from Day 2 .

2. Clean the container and throw away the egg.

When recording the circumference of the egg do so in centimeters. Your observations should describe the appearance of the egg and any other important facts you notice. Look at the color, size, shape, texture and anything that changes about the egg throughout the experiment.

Below is a sample of how to set up your lab page to record your experimental data. You should leave as much space as needed for each part.

Sample Lab Notebook Setup:

1.Describe what happened to the egg after soaking it in vinegar for 24 hours.

2.Describe what happened to the egg after soaking it in corn syrup for 24 hours.

3.Describe what happened to the egg after soaking it in the distilled water for 24 hours.

4.How did you see diffusion and osmosis in this lab?

Fill in the chart as you go through the experiment. When done with the experiment answer the post lab questions. Submit your lab page with your observations and answers to the post-lab questions. You can submit either a picture of your work or upload a document.

Things to remember:

Qualitative observations describe appearance (color, texture, shape, size, smell, etc.)
The variables in this lab are vinegar, corn syrup, and distilled water.
The controlled variables are the egg, beaker, and the time the egg is exposed to each substance.
The independent variable is the substance the egg is submerged in (vinegar, corn syrup, and distilled water).
The dependent variable is what happens to the egg after being exposed to the three different substances.

Biology Special Lesson: Diffusion Lab

This rubric is an outline of how the lab information you submit will be graded.

Grading Rubric

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CSE 2221 Lecture 9: AppendUndorView1

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