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jpanel swicthing problem....

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Join Date: Jun 2008

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rude04

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Re: jpanel swicthing problem....

#11

Dec 22nd, 2008

uhhm..i have another question..
whats the simpliest code to display a PDF file inside a JTextArea??

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Ezzaral

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Re: jpanel swicthing problem....

#12

Dec 22nd, 2008

Haven't used it myself, but you might take a look at this article on using the Acrobat Viewer bean: http://today.java.net/pub/a/today/20...-javabean.html

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Re: jpanel swicthing problem....

#13

Dec 23rd, 2008

thanks Ezzaral!!^^

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Re: jpanel swicthing problem....

#14

Dec 25th, 2008

i really appreciate the code that you gave me but could you explain to me how this code works and what each part do??thanks..

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
	private void setQuestion(String str){ question = str;}
	public String getQuestion(){ return question;}
	private void setQuestion(String str){ question = str;}
	public String getQuestion(){ return question;}

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Originally Posted by peter_budo

Test class as suggested
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java Syntax (Toggle Plain Text)
public class Test
{
	private String question;
	private String optionA;
	private String optionB;
	private String optionC;
	private String answer;
 
	public Test(){}
 
	public Test(String quest, String oA, String oB, String oC, String ans)
	{
		setQuestion(quest);
		setOptionA(oA);
		setOptionB(oB);
		setOptionC(oC);
		setAnswer(ans);
	}
 
	private void setQuestion(String str){ question = str;}
	public String getQuestion(){ return question;}
 
	private void setOptionA(String str){ optionA = str;}
	public String getOptionA(){ return optionA;}
 
	private void setOptionB(String str){ optionB = str;}
	public String getOptionB(){ return optionB;}
 
	private void setOptionC(String str){ optionC = str;}
	public String getOptionC(){ return optionC;}
 
	private void setAnswer(String str){ answer = str;}
	public String getAnswer(){ return answer;}
}
public class Test { private String question; private String optionA; private String optionB; private String optionC; private String answer; public Test(){} public Test(String quest, String oA, String oB, String oC, String ans) { setQuestion(quest); setOptionA(oA); setOptionB(oB); setOptionC(oC); setAnswer(ans); } private void setQuestion(String str){ question = str;} public String getQuestion(){ return question;} private void setOptionA(String str){ optionA = str;} public String getOptionA(){ return optionA;} private void setOptionB(String str){ optionB = str;} public String getOptionB(){ return optionB;} private void setOptionC(String str){ optionC = str;} public String getOptionC(){ return optionC;} private void setAnswer(String str){ answer = str;} public String getAnswer(){ return answer;} }

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Re: jpanel swicthing problem....

#15

Dec 25th, 2008

These methods are setter and getter as they help you initialize and retrieve value from an Object to which they are related to, hence the prefix of each method

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(Toggle Plain Text)

private void setQuestion(String str){ question = str;}
public String getQuestion(){ return question;}

depending on project requirement you will make setter private or public, where getter is usually public.

In original code there is call for initializeTest() method that looks like this

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
    private void initializeTest()
    {
    	test[0] = new Test("Question 1 to ask", "I like A", "I like B", "I like C", "I like B");
    	test[1] = new Test("Question 2 to ask", "I like A", "I like B", "I like C", "I like A");
    	test[2] = new Test("Question 3 to ask", "I like A", "I like B", "I like C", "I like C");
    }
    private void initializeTest()
    {
    	test[0] = new Test("Question 1 to ask", "I like A", "I like B", "I like C", "I like B");
    	test[1] = new Test("Question 2 to ask", "I like A", "I like B", "I like C", "I like A");
    	test[2] = new Test("Question 3 to ask", "I like A", "I like B", "I like C", "I like C");
    }

in this method with every call for new Test a new object of type Test is created and because arguments been provided newly created object is automatically initialized with these arguments. The initialization take place in the constructors like in our case in this one

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
	public Test(String quest, String oA, String oB, String oC, String ans)
	{
		setQuestion(quest);
		setOptionA(oA);
		setOptionB(oB);
		setOptionC(oC);
		setAnswer(ans);
	}
	public Test(String quest, String oA, String oB, String oC, String ans)
	{
		setQuestion(quest);
		setOptionA(oA);
		setOptionB(oB);
		setOptionC(oC);
		setAnswer(ans);
	}

where with the help of setter methods we initialize every variable of the Test object. If the setter method would be public instead of private we could do something like this

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 Java Syntax (Toggle Plain Text) 
test[0] = new Test();
test[0].setQuestion("Question 1 to ask");
test[0].setOptionA("I like A");
test[0].setOptionB("I like B");
test[0].setOptionB("I like B");
test[0].setAnswer("I like B");
test[0] = new Test();
test[0].setQuestion("Question 1 to ask");
test[0].setOptionA("I like A");
test[0].setOptionB("I like B");
test[0].setOptionB("I like B");
test[0].setAnswer("I like B");

but this would be time consuming if we want to initialize more one object.

Getter method public String getQuestion(){ return question;} as you see return value of associated variable. These been used here

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    private void setTest()
    {
    	titleLabel.setText("Question No. " + (qNum+1));
        questionNumLabel.setText((qNum+1)+"/3");
        
        questionLabel.setText(test[qNum].getQuestion());
        jrbA.setText(test[qNum].getOptionA());
        jrbB.setText(test[qNum].getOptionB());
        jrbC.setText(test[qNum].getOptionC());
        qNum++;
        if(qNum == 3)
        {
        	nextButton.setText("SUBMIT");
        }        
    }

More about how classes works, members variable declaration, defining methods and more could be found here

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