RAD Women II Static vs. Non Static Discussion File

ExecuteAnonymousApex.apex

//instance of a class
TestStaticVsNonStatic myTestClass = new TestStaticVsNonstatic('This String Is A Parameter');

//accessing class variables
System.debug('myStaticString: ' + TestStaticVsNonStatic.myStaticString); //we access via ClassName.VariableName
System.debug('myNonStaticString: ' + myTestClass.myNonStaticString); //we access via InstanceName.VariableName

//access instance of myStaticString
//commented out because we expect an error
//System.debug('myStaticString: ' + myTestClass.myStaticString); //we access via InstanceName.VariableName => get "static variable in non-static context error"

//access class variable of myNonStaticString
//commented out because we expect an error
//System.debug('myNonStaticString: ' + TestStaticVsNonStatic.myNonStaticString); //we access via ClassName.VariableName => get "variable does not exist error" because we have not created an instance of the class

//call static method
TestStaticVsNonStatic.myStaticMethod(); //dot notation ClassName.MethodName()

//call nonstatic method
myTestClass.myNonStaticMethod(); //dot notation InstanceName.MethodName();

TestStaticVsNonStatic.cls

public class TestStaticVsNonStatic {
	//class variables
    public static String myStaticString = 'My String Is Static'; //Accessible via dot notation ClassName.VariableName
    public String myNonStaticString;
    
    //constructor
    public TestStaticVsNonStatic(String nonstaticString) {
        this.myNonStaticString = nonstaticString; //This Instance Is Non-Static: access non-static/instance variables with `this.`
    }
    
    public static void myStaticMethod() {
        System.Debug('Calling Static Method');
    }
    
    public void myNonStaticMethod() {
        System.Debug('Calling Non-Static Method');
    }
}