questions mock

[ashish mittal]

Hi Javaranchers ! found these questions in newboone's exam , but answers were not given , please tell me the answers to these three
How you can use the escape notation \u to set the variable c, declared as a char, to the Unicode character whose value is hex 0x30A0?

Another question
What letters get written to the standard output with the following code? class Unchecked {
public static void main(String[] args) {
try {
method();
} catch (Exception e) {
}
}

static void method() {
try {
wrench();
System.out.println("a");
} catch (ArithmeticException e) {
System.out.println("b");
} finally {
System.out.println("c");
}
System.out.println("d");
}

static void wrench() {
throw new NullPointerException();
}
}

Select all valid answers.
"a"
"b"
"c"
"d"
none of these

If you supply a target object when you create a new Thread, as in: Thread t = new Thread(targetObject);
What test of instanceof does targetObject have to pass for this to be legal?
Select the one right answer.
targetObject instanceof Thread
targetObject instanceof Object
targetObject instanceof Applet
targetObject instanceof Runnable
targetObject instanceof String

[Alex Sbityakov]

char c = '\u30A0'
targetObject must be Runnable
for the exception question, you're best to work through it and/or run the code yourself,
Alex

[Vanitha Sugumaran]

Hi,
Explanation for the exception question.

<font size = "+0">
class Unchecked { 
public static void main(String[] args) { 
try { 
method();
/* this block can catch NPE 
because NPE's superclass RunTimeE extends Exception */
} catch (Exception e) { 
} 
} 

static void method() { 
try { 
wrench(); 
//can't catch NPE here because AE & NPE are not related.
//So this try blocks throw NPE back to main method try{}
System.out.println("a"); 
} catch (ArithmeticException e) { 
System.out.println("b");
} finally { 
/*If finally block provided then it is exeuted 
whether the try{}catches the exception or not*/
System.out.println("c");
} 
System.out.println("d"); 
} 

static void wrench() { 
throw new NullPointerException(); 
//throwing NPE 
}
} 

So it prints only c.
Hope this helps,
Vanitha.

[This message has been edited by Vanitha Sugumaran (edited August 12, 2001).]