Q12
What will be written to the standard output when the following program is run?
public class Qd803 {
public static void main(String args[]) {
String word = "restructure";
System.out.println(word.substring(2, 3));
}
}
1) est
2) es
3) str
4) st
5) s
Q13
Given that a static method doIt() in a class Work represents work to be done, what block of code will succeed in starting a new thread that will do the work?
CODE BLOCK A:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
Thread t = new Thread(r);
t.start();
CODE BLOCK B:
Thread t = new Thread() {
public void start() {
Work.doIt();
}
};
t.start();
CODE BLOCK C:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
r.start();
CODE BLOCK D:
Thread t = new Thread(new Work());
t.start();
CODE BLOCK E:
Runnable t = new Runnable() {
public void run() {
Work.doIt();
}
};
t.run();
1) Code block A.
2) Code block B.
3) Code block C.
4) Code block D.
5) Code block E.
Q14
Write a line of code that declares a variable named layout of type LayoutManager and initializes it with a new object, which when used with a container can lay out components in a rectangular grid of equal-sized rectangles, 3 components wide and 2 components high.
Q15
public class Q275d {
static int a;
int b;
public Q275d() {
int c;
c = a;
a++;
b += c;
}
public static void main(String args[]) {
new Q275d();
}
}
1) The code will fail to compile, since the constructor is trying to access static members.
2) The code will fail to compile, since the constructor is trying to use static member variable a before it has been initialized.
3) The code will fail to compile, since the constructor is trying to use member variable b before it has been initialized.
4) The code will fail to compile, since the constructor is trying to use local variable c before it has been initialized.
5) The code will compile and run without any problems.