Cannot Switch modes correctly

[Bhushan Nagaonkar]

Code is as follows :

if(mode.toLowerCase() == "cpp")

{

//editor = ace.edit("editor");

editor.setTheme("ace/theme/monokai");

var c_cppMode = require("ace/mode/c_cpp").Mode;

editor.getSession().setMode(new c_cppMode());

}

else

if(mode.toLowerCase() == "java")

{

//editor = ace.edit("editor");

editor.setTheme("ace/theme/clouds");

var JavaMode = require("ace/mode/java").Mode;
editor.getSession().setMode(new JavaMode());

}

When I switch mode to java theme "clouds" is set and then when I switch to CPP mode theme "monokai" is set but when I again try to switch to JAVA mode the "monokai"  still remain instead of whoch "clouds" them should be set.

I cannot understand the problem here? Plzz help guys