java - How can i use methods of a class to a new class? -

well have menu method in class shows menu in emulator when clicked.

how can use method new class b

i want methods use class b :

public boolean oncreateoptionsmenu(menu menu) {     super.oncreateoptionsmenu(menu);     //inflates menu or show activity     menuinflater awesome = getmenuinflater();     awesome.inflate(r.menu.main, menu); //main xml main      return true; }  //this manipulate menu public boolean onoptionsitemselected(menuitem item){     switch (item.getitemid()) {     case r.id.menusweet:         startactivity(new intent("sweet"));         return true;      case r.id.menutoast:         toast andeggs = toast.maketext(mainactivity.this,         "this toast", toast.length_long);         andeggs.show();         return true;      default:         return super.onoptionsitemselected(item);     }  } 

depending on want do, have 2 big options (among many): subclassing , composition:

subclassing

so if class b specialization of class a's behavior (b is a special case of a), extend class a:

class {    public boolean onoptionsitemselected(menuitem item); }  class b extends {    // methods b has. } 

thus may call

b b = new b(); b.onoptionsitemselected(someitem); 

composition

the second option wrapping method call it's own method of same name (so b has an object , uses it):

class b {     private a = new a();      public boolean onoptionsitemselected(item someitem) {        a.onoptionsitemselected(someitem);     } }