| Maybe, but I need more deets. And seriously, guy, ask the goddamn question in the OP. Don't wait for replies before posting the info you have. |
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| Ok well first of all, I'd change it from MP3 objects to MP3Name objects just because you're not comparing the actual bits in the Mp3 but the filename itself, but that's just me. Also, I'm very confused with what you mean by "update the existing one" considering you would just be inserting all the same characters again. You say you have the GUI up so I'll just go off what I assume you have displayed. import javax.swing.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.*; import javax.swing.JButton; public class YourClass extends JFrame implements ActionListener { private JButton yourButton = new JButton("Add/Modify MP3"); private JTextField MP3NameField = new JTextField(); private List<String> MP3Names = new ArrayList<>(); public void YourClass() { this.add(this.MP3NameField); this.add(this.yourButton); } @Override public void actionPerformed(ActionEvent e) { int index = 0; String temp_MP3Name; // this will hold the string within textfield // MP3NameField // store string from MP3NameField in temp variable for easy access temp_MP3Name = this.MP3NameField.getText(); // ensure the list MP3Names isn't empty if(!MP3Names.isEmpty()) { // now loop through the list MP3Names for that MP3Name string while(index < MP3Names.size()) { // this ignores character case and compares the strings from the textfield and the // string stored at a specific index in the list MP3Names if(temp_MP3Name.compareToIgnoreCase(MP3Names.get(index)) == 0) { // if no differences between strings, update object at index MP3Names.set(index, temp_MP3Name); }else { // if differences between strings are found, consider this a new MP3 name and // append it to the list MP3Names MP3Names.add(temp_MP3Name); } index++; } } } } gods I hope my formatting sticks. edit: Nope. Formatting didn't stick :( |
Old_RavenOct 6, 2016 8:38 PM
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| need help The GArt store has asked you to implement a computer program to determine the number of cans of paint, along with the cost, to paint a room of a given size with a given color. To simplify the design of the program and to learn about modularity, write this program using several methods. Method 1: This method will get input from the user: one dimension of the room. Assume the room has 4 walls and a ceiling to paint and is rectangular. Two walls will have size height*length and two will have height*width. The ceiling’s size is length*width. The floor will not be painted. This method is passed two parameters, a String parameter indicating which dimension is being requested (height, length, or width), and a Scanner. Both the String and the Scanner will be declared in main. The String will be used in a prompt to inform the user which dimension to enter. The Scanner will be used an input statement. This method will then get the input from the user as an int, stored in a temporary variable like result from method 3 of part 1 of this lab. This value will be returned. You will call this method 3 times, once for height, once for length and once for width in order to get the 3 dimensions of the room. public static int getSize( String caption, Scanner input ) { System.out.print("Enter the " + caption + " of the room: "); int value = input.nextInt(); return value; } |
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| I've already got it. |
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| In main, I have height, width, and length values and called it back into the 2nd method. |
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Chihiya said: sullynathan said: In main, I have height, width, and length values and called it back into the 2nd method. Okay doki.aThat's cool. another one This is all my code. I am having problems with the standard deviation formula. I run the program with these values: Number of items: 5 Items: 16 25 81 80 24 I'm supposed to get this output: Average: 45.20 Std Dev: 32.41 Less than Avg: 3 Array is not in sorted order Instead, I get this output: Array is not in sorted order Average: 45.20 Std Dev: 55.60 Less than Avg: 3 import java.text.DecimalFormat; import java.util.Scanner; public class array { public static void main(String[] args) { Scanner input = new Scanner(System.in); DecimalFormat df = new DecimalFormat ("#.00"); System.out.println("How many values do you want?"); int num = input.nextInt(); if (num< 1 || num > 100) { System.out.println("Error"); System.exit(0); } int[] array= valueArray(input, num); double o= average(num, array); double standdev = getStdDev(array, num); int lessThanAvg = lessAvg ( array, num, o ); boolean sorted=isArraySorted(array, num); System.out.println("Average: " + df.format(o)); System.out.println("Std Dev: " + df.format(standdev)); System.out.println("Less than Avg: " + lessThanAvg); } public static int[] valueArray (Scanner input, int num ) { int[] values = new int[100]; System.out.println("What numbers do you want to put in?"); for (int j = 0; j < num; j++) { values[j]=input.nextInt(); } return values; } public static double average ( int num ,int[] values) { double avg=0.0; for (int i = 0; i < num; i++) { avg = avg+values[i]; } return avg/num; } public static double getStdDev (int [] values, int num) { double avg = 0.0; double sum = 0 ; for (int i = 0; i < num - 1; i++) { sum = Math.sqrt ((Math.pow((values[i]-avg),2) + Math.pow((values[num-1]),2)) / num-1); } return sum; } public static int lessAvg ( int [] values, int num, double avg ) { int counter = 0; for (int i = 0; i < num; i++ ) { if (values[i] < avg) { counter = counter + 1; } } return counter; } public static boolean isArraySorted (int [] values, int num) { for (int i = 0; i < num - 2; i++) { if (values[i]>values[i+1]) { System.out.println("Array is not in sorted order"); return false; } } System.out.println("Array is in sorted order"); return true; } |
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