printing the values of an array

[Savanna Ray]

Hello!

I have almost finished making this code work. It's supposed to print out the name/value pairs of a query string (eg.from a form URL query string).
I've got it to print out the 'name' part of the pair array, but can't seem to print out the 'value' part.

Here's the code:

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
 
public class Labform2 extends Applet{
 
    private Util util;
    public void init() {
        util = new Util(getGraphics());
    }
 
    public void paint(Graphics g) {
 
        String query = "Surname=Smith&GivenName=Jane&SIN=123456789&age=21";
        Form form = new Form(query);
 
        util.display("The query string: " + query);
        util.print(form.getNames(), form.getValue(form[1].getName()));
    }
}
 
class Form {
 
    private Pair[] form;
 
    public Form(String query) {
 
        form = parsePairs(query);
    }
 
    public String[] getNames() {
 
        String[] names = new String[form.length];
        for (int i=0; i < names.length; i++) {
            names[i] = form[i].getName();
        }
 
        return names;
    }
 
    public String getValue(String name) {
 
        String val = name;
        String retvalue = " ";
        int valuenr = 0;
 
        for (int i = 0; name != form[i].getName(); i++) {
            if (name == form[i].getName()) {
                valuenr = i;
                retvalue = form[i].getValue();
            }
        }
        return retvalue;
 
    }
 
    private Pair[] parsePairs(String query) {
 
        StringTokenizer tokens = new StringTokenizer(query, "&");
        Pair[] pairs = new Pair[tokens.countTokens()];
        int i = 0;
        while (tokens.hasMoreTokens()) {
            String token = tokens.nextToken();
            Pair p = parsePair(token);
            pairs[i] = p;
            i++;
        }
        return pairs;
 
    }
 
    private Pair parsePair(String nameValueString) {
 
        int pos = nameValueString.indexOf('=');
        String name = nameValueString.substring(0, pos);
        String value = nameValueString.substring(pos + 1);
        Pair p = new Pair(name, value);
        return p;
    }
 
    private int charCount(String str, char search) {
 
        int i=0;
        int count = 0;
 
        while (i < str.length()) {
 
           char ch = str.charAt(i);
           if (ch == search) {
               count++;
           }
           i++;
        }
        return count;
    }
}
 
class Pair {
 
    private String name;
    private String value;
 
    public Pair(String name, String value) {
 
        this.name = name;
        this.value = value;
    }
 
    public String getName() {
 
        return name;
    }
 
    public String getValue() {
 
        return value;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public void setValue(String value) {
        this.value = value;
    }
}
 
class Util {
 
    private Graphics g;
    private int lineNr = 0;
 
    public Util(Graphics g) {
 
        this.g = g;
    }
 
    public void reset() {
        this.lineNr = 0;
    }
 
    public void display(String msg) {
        int x = 10;
        int y = 15;
        int incr = 15;
        g.drawString(msg, x, y + incr * lineNr++);
    }
 
    public void display(String[] array) {
 
        int length = array.length;
        for (int i = 0; i < length; i++) {
            display(" " + i + ": " + array[i]);
        }
    }
    public void print(String[] array, String name) {
 
        int x = 10;
        int y = 35;
        int incr = 15;
        for (int i=0; i < array.length; i++) {
 
            g.drawString("" + array[i] + "/" + form.getValue(array[i]), x, y + incr * i);
        }
    }
}

I changed the print method, in util class, to take a String name as well, but it didn't compile. Any suggestions on how to print the last half of the array?

Thanks so much...
Almost finished

[Savanna Ray]

I thought it would be able to access the form class from the print method, but compiling says it can't find symbol variable form.
Maybe I should be invoking the method getValue differently?

[Rick Portugal]

I'm not completely sure what you're trying to accomlish. It seems that this code could be simplified. But take a look at this and let me know if this helps:

import java.applet.Applet;
import java.awt.*;
import java.util.StringTokenizer;
 
public class Labform2 extends Applet {
private Util util;
public void init() {
util = new Util(getGraphics());
}
public void paint(Graphics g) {
String query = "Surname=Smith&GivenName=Jane&SIN=123456789&age=21";
Form form = new Form(query);
util.display("The query string: " + query);
util.print(form.getNames(), form.getValues());
}
}
 
class Form {
private Pair[] form;
public Form(String query) {
form = parsePairs(query);
}
public String[] getNames() {
String[] names = new String[form.length];
for (int i = 0; i < names.length; i++) {
names[i] = form[i].getName();
}
return names;
}
public String[] getValues() {

String[] values = new String[form.length];
for (int i = 0; i < values.length; i++) {
values[i] = form[i].getValue();
}
return values;
}
private Pair[] parsePairs(String query) {
StringTokenizer tokens = new StringTokenizer(query, "&");
Pair[] pairs = new Pair[tokens.countTokens()];
int i = 0;
while (tokens.hasMoreTokens()) {
String token = tokens.nextToken();
Pair p = parsePair(token);
pairs[i] = p;
i++;
}
return pairs;
}
private Pair parsePair(String nameValueString) {
int pos = nameValueString.indexOf('=');
String name = nameValueString.substring(0, pos);
String value = nameValueString.substring(pos + 1);
Pair p = new Pair(name, value);
return p;
}
private int charCount(String str, char search) {
int i = 0;
int count = 0;
while (i < str.length()) {
char ch = str.charAt(i);
if (ch == search) {
count++;
}
i++;
}
return count;
}
}
 
class Pair {
private String name;
private String value;
public Pair(String name, String value) {
this.name = name;
this.value = value;
}
public String getName() {
return name;
}
public String getValue() {
return value;
}
public void setName(String name) {
this.name = name;
}
public void setValue(String value) {
this.value = value;
}
}
 
class Util {
private Graphics g;
private int lineNr = 0;
public Util(Graphics g) {
this.g = g;
}
public void reset() {
this.lineNr = 0;
}
public void display(String msg) {
int x = 10;
int y = 15;
int incr = 15;
g.drawString(msg, x, y + incr * lineNr++);
}
public void display(String[] array) {
int length = array.length;
for (int i = 0; i < length; i++) {
display(" " + i + ": " + array[i]);
}
}
public void print(String[] array, String[] name) {
int x = 10;
int y = 35;
int incr = 15;
for (int i = 0; i < array.length; i++) {
g.drawString("" + array[i] + "/" + name[i],x,y + incr * i);
}
}
}

I made the getValues() method just like the getNames() method. I also changed the Util.print() method to accept two arrays of Strings. I'm puzzled as to why the Util.print method uses arrays called array and name. I would have expected something like "name" and "value".

Hope that helps.