Make Simple Program Which Takes In Argument?

May 12, 2015

So I'm trying to make a simple program which takes in an argument (target) and then looks through an ArrayList of strings. If it finds a string that begins with (target) then it will return the index of that string. If it doesn't find a string which begins with (target) then it will return -1 instead.

For some reason, the program is always returning -1, rather than the index of the string within the ArrayList when there is one which matches the search criteria.

Here is the code:

public int getIndex(ArrayList<String> text, String target)
{
int i = 0;
int index = -1;
boolean found = false;

[Code].....

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public class Caesar {
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[code]....

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[ATTACH=CONFIG]27j.jpg49[/ATTACH]Hello,

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I don't know if I explained right, so here's a line thing of how the classes relate:

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Java Code:

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import java.awt.GridLayout;
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[Code] ....

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Line 13
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[Code].....

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I'm very new to Java (I literally started learning it yesterday) and I've been working on a simple program that's meant to simulate interactions between optics objects and light rays.

Everything has been going really well, except that my mirrors only reflect the first ray that comes in contact with them.

Here's a screenshot : 2014-09-13 at 7.39.23 PM.jpg

I wrote 7 classes:

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What I know so far is that the problem boils down to the checkRay() function in the Optics class. When a mirror has already reflected a ray, the line:

Intersection sec = new Intersection(ray,(Mirror)obj);

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I debugged it line by line and found the problem was that my variable 't' (that is the parameter for the parametric line which represents the mirror) in the Intersection class got big values when it's meant to be between 0 and 1 (since it's a line segment), which resulted in the function returning null (as it should when 't' is not between 0 and 1).

I've confirmed with tests that this has nothing to do with the specific mirror or angle of incidence. It only occurs when a mirror has already been intersected with by a ray.

I've found out that my function:

public PVector getNormal(PVector D){
D.normalize();
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}

Changes the value of the 'D' PVector of the mirror inside my 'objects' ArrayList. How can it access the private PVector 'D' from outside the Mirror class? This normalization to the direction vector is what causes the Intersection class to return null the second time around!

The problem was that in the getNormal function, the input vector argument was a reference to the 'D' vector for the mirror in my 'objects' ArrayList so the .normalize() function acted upon the original vector, changing it's value and screwing things up. The two classes I talked about:

Optics: (note line 64. this line returns a null intersection when it shouldn't)

package ofer.davidson;
 import java.util.ArrayList;
 public class Optics {
 //Arrays to store all the optics objects and rays that are created
ArrayList<Object> objects;
ArrayList<Ray> rays;
 
[Code] .....

Also why doesn't my background turn white??

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Aug 12, 2014

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With compound interest, the interest is applied to all money earned. So, starting with $1000 at 10% annual interest, after one year the user would have $1100 (the original amount plus $100 interest) and after two years the user would have $1210 (the $1100 they started with at the beginning of the year plus the $110 interest).

The requirements of this program are:

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Sample output ($10000 initial investment, 10% simple interest, annual, for 4 years):

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2 11000.00 1000.00 12000.00
3 12000.00 1000.00 13000.00
4 13000.00 1000.00 14000.00

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Here is the code! :

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Java Code: import java.util.Scanner;
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[code]....

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