Object Oriented Programming
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The following code has error(s).public class Demo{ void m(){ throw new java.io.IOException("Exception"); System.out.println("1"); } void n(){ m(); System.out.println("2"); } void p(){ try{ n(); }catch(Exception e){System.out.println("3");} } public static void main(String args[]){ Demo obj=new Demo(); obj.p(); System.out.println("4"); } }
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
The following code has error(s).
class Demo{ void msg() { System.out.println("1"); } } public class Sample extends Demo{ @Override void msg() throws Exception { System.out.println("2"); } public static void main(String args[]) { Demo obj = new Sample(); obj.msg(); } }
class Demo{ void msg() { System.out.println("1"); } } public class Sample extends Demo{ @Override void msg() throws ArithmeticException { System.out.println("2"); } public static void main(String args[]) { Demo obj = new Sample(); obj.msg(); } }
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
Final methods can be overloaded but they cannot be overridden.
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
Which of the following statements are true regarding the HashSet class?
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
An instance variable cannot be static. But, a local variable can be made static.
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
Which of the following is a correct declaration of a generic class?
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false");
// Disable copy, paste, text selection, and right-click context menu
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false");
// Prevent new tab and new window shortcuts
window.addEventListener("keydown", function(event) {
if ((event.ctrlKey && event.key === 't') || (event.ctrlKey && event.key === 'n')) {
event.preventDefault();
alert("Opening a new tab or window is not allowed during the quiz.");
// Close the current tab or new window immediately
window.close();
}
});
// Detect and close the tab if the user tries to switch away from it
document.addEventListener("visibilitychange", function() {
if (document.visibilityState === "hidden") {
alert("Please stay on this tab to complete the quiz.");
// Reload the page if user tries to leave the tab
location.reload();
}
});
// Block certain key combinations for opening developer tools
window.addEventListener("keydown", function(event) {
if ((event.ctrlKey && event.shiftKey && event.key === 'i') || // Ctrl+Shift+I
(event.ctrlKey && event.shiftKey && event.key === 'j') || // Ctrl+Shift+J
(event.ctrlKey && event.shiftKey && event.key === 'c') || // Ctrl+Shift+C
(event.ctrlKey && event.key === 'u')) { // Ctrl+U
event.preventDefault();
alert("Developer tools are disabled during the quiz.");
}
});
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false");
When an ArrayList is initialized, a default capacity of ____ is assigned to the ArrayList.
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
What is the purpose of the diamond operator(<>) in Java generics?
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
What is the output?
int a=8; System.out.println(a++ + a++); System.out.println(a<<3);System.out.println(a<~a&&a++<~a); System.out.println(a);
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
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