What is wrong with my code?

[Venkata Raaman]

Hi i am trying to write some code regarding static method/var access:
Here is the code:

 
public class MystaticExample{
	static int z = 0;
	
	public static void x(){ System.out.println("I am in MystaticExample class's static method");	}
	public void y(){ System.out.println( "In MystaticExample's method y()"); }
	public String z(){System.out.println("I am in method z");}

public static void main(String[] args) {
MystaticExample st = new MystaticExample();
		st.x();//Syntax error on token "x", Identifier expected after this token
		st.y();//Syntax error on token "Y", Identifier expected after this token
}

[Mohamed Sanaulla]

With the current code there are few errors- There is no closing } for the class declaration, there is no return type in method z().

[Jim Jonides]

How did you get that errors? Can you fix problems that Mohamed mentioned and let us know if you are still getting the same errors?

[Venkata Raaman]

Jim Jonides wrote:How did you get that errors? Can you fix problems that Mohamed mentioned and let us know if you are still getting the same errors?

I refined the code: I still get a warning kinda but the program compiles: here is the code:

public class MystaticEx2 {
static int z = 0;
	
	public static void x(){ 
		System.out.println("I am in MystaticExample class's static method");
		}
	
	public void y(){
		System.out.println( "In MystaticExample's method y()");
		}

	public static void main(String[] args) {
		MystaticEx2 inst = new MystaticEx2();
		//MysubClass sub = new MysubClass();
    	//sub.x();//accessing static methods by  creating object NOT POSSIBLE
    	
		//sub.y();//calling non-static method using object reference OK
		
		inst.x(); // warning:The static method x() from the type MystaticEx2 should be accessed in a static way
                               //fixes -change access to static using declarative type(Mystatic2)
                              //OR remove static in method
		MystaticEx2.x();
		inst.y();
		x();
		y();//Can NOT call non-static methods without creating object referencE
		
		
}

ERROR:Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Cannot make a static reference to the non-static method y() from the type MystaticEx2

at MystaticEx2.main(MystaticEx2.java:24)

[Jim Jonides]

You can ignore the warning, Java allows you to call static method on an instance object. The error you got from the last line is as expected - you can not call instance method in a static method without using an instance object.

[Abhay Agarwal]

Static - mean class level. main() method is a static method and y() is a non static method.
Static method can be referenced directly by it's name without any instance object in a Static method only.

A non static method would require an instance object to be invoked from a static method (for eg - main())

correct invokation code for y() would be

inst.y();

[Mohamed Sanaulla]

Its recommended to use the Class name for accessing static members.

[Venkata Raaman]

Thanks all....So In exam they do make sure those kind of questions (warnings) not shows up??just curious...!! OR they include those kind of questions as trick??

[Mohamed Sanaulla]

Yes, there would be questions which also check the warnings.