How does the set collection deal with duplicate elements?

Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?

Can Java be used to send ICMP packets?

What would happen on compiling and running the following code? public class Test { public static void main (String args[]) { TestThread t = new TestThread (); t.setValue (5); t.start (); t.setValue (10); } } class TestThread extends Thread { private int value; synchronized public void setValue (int v) { value = v; } public void run () { System.out.println ('before: ' + value); setValue (50); System.out.println (after: ' + value); } }

Choose the correct statements:

Consider the following: String sub ='hello'.substring(2, 3); What is the value of sub?

Boolean values can be displayed as the words true and false with the ________ format specifier.

Before entering a loop, the first input statement, or ____, is retrieved.

Arguments to methods always appear within ________.

Any field declared with keyword ________ is constant.

Another name for a nonstatic member class is a(n) ____.