Object Oriented Programming
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Choose the compelling reasons for using nested classes:
- If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together.
- Consider two top-level classes, A and B, where B needs access to members of A that would otherwise be declared private. By hiding class B within class A, A's members can be declared private and B can access them. In addition, B itself can be hidden from the outside world.
- Nesting small classes within top-level classes places the code closer to where it is used.
/**/
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 will be the output of the following Java program?
// 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");
What will be the output of the following Java program?
Which of these method of ArrayList class is used to obtain present size of an object?
What will be the output of the following Java code?
class multithreaded_programing
{ public static void main(String args[])
Thread t = Thread.currentThread();
System.out.println(t);
}
}
// 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");
Identify the statement(s) applicable for StringBuffer.
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
Identify the features of Vector 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"); /**/
_____ in class Thread is used to check whether the current thread being checked is still running.
Identify the properties of LinkedList.
/**/
document.oncopy = new Function("return false");
document.onpaste = new Function("return false");
document.onselectstart = new Function("return false");
document.oncontextmenu = new Function("return false"); /**/
Choose the uses of Iterator.
/**/
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");
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