For Instance how can I use the input 'hasTypedSomeToken' in my Anonymou inner class in the following -
public class Login { void display(boolean hasTypedSomeToken) { //some code here Button btnLogIn = new Button("Login", new ClickHandler() { @Override public void onClick(ClickEvent event) { if(Login.this.hasTypedSomeToken) //HOW TO USE hasTypedSomeToken HERE { //do something } } } } First of all, you have to make it final:
void display(final boolean hasTypedSomeToken) Then you can refer to it simply as hasTypedSomeToken:
if (hasTypedSomeToken) ... The variables declared within a method are local variables. e.g. hasTypedSomeToken and btnLogIn are local variables in your display method.
And if you want to use those variables inside a local inner class (classes that are defined inside a method e.g. the anonymous class that implements ClickHandler in your case) then you have to declare them final.
e.g.
void display(final boolean hasTypedSomeToken) { If you look at Login.this.hasTypedSomeToken, this is used to access member variables. Local variables are not members of class. They are automatic variables that live only within the method.
You need to declare it final, like this void display(final boolean hasTypedSomeToken), and use it without prefixes: if(hasTypedSomeToken).
Make the variable final:
public class Login { void display(final boolean hasTypedSomeToken) { Button btnLogIn = new Button("Login", new ClickHandler() { @Override public void onClick(ClickEvent event) { if (hasTypedSomeToken) { // frob a widget } } }); } } 
Login.this.somethingis for accessing field of thisLogininstance.