basic constructor question

[786snow]

Hi, what am i doing wrong here. I have couple of variable in the constructor but when try
to print them i get errors

public class HelloWorldApp2 {

 HelloWorldApp2 (String var1, int var2){

String instanceVariable1 = var1;
int instanceVariable2 =var2;

}

 public static void main(String args[]) {
 HelloWorldApp2 object6 = new HelloWorldApp2("USA", 2);
 object6.letSee();
}

public void letSee()
	{

		System.out.println("calling class no 4\n");
		System.out.println(instanceVariable1 + "\n");
		System.out.println(instanceVariable2 + "\n");
	
	}


}

I get these erors

 C:\Program Files\Java\jdk1.5.0_06\bin>javac HelloWorldApp2.java
HelloWorldApp2.java:20: cannot find symbol
symbol  : variable instanceVariable1
location: class HelloWorldApp2
                System.out.println(instanceVariable1 + "\n");
                                   ^
HelloWorldApp2.java:21: cannot find symbol
symbol  : variable instanceVariable2
location: class HelloWorldApp2
                System.out.println(instanceVariable2 + "\n");
                                   ^
2 errors

 

[Diancecht]

Please use the Java forum for this kind of questions.

The problem is that, as in your last post, you are declaring the variables in the constructor, so they're not in scope when you call them

http://java.about.com/library/weekly/aa_vars_1.htm

Cheers,
Dian

 

[ronnyjljr]

instanceVariable1 and 2 are not in letsee() method's scope; that is, it has no idea they exist. You have them declared and initialized inside the constructor, which only the constructor can use; pretty much useless.

Declare them in the main body of the class, then other methods can use them.

public class HelloWorldApp2 {

[red]
 private String instanceVariable1;
 private int instanceVariable2;
[/red]

 HelloWorldApp2 (String var1, int var2){
[red]
     instanceVariable1 = var1;
     instanceVariable2 =var2;
[/red]
}

 public static void main(String args[]) {
 HelloWorldApp2 object6 = new HelloWorldApp2("USA", 2);
 object6.letSee();
}

public void letSee()
    {

        System.out.println("calling class no 4\n");
        System.out.println(instanceVariable1 + "\n");
        System.out.println(instanceVariable2 + "\n");
    
    }


}

Hope that helps,
Ron

typedef map<GiantX,gold, less<std::shortestpathtogold> > AwesomeMap;

 

[786snow]

thanks a lot for your help ........ I understand now