A Programmer[ap]s Guide to Java Certification

What would be printed during execution of the following program?

public class MyClass { public static void main(String[] args) { test(1<<32, "1<<32"); test(1<<31, "1<<31"); test(1<<30, "1<<30"); test(1, "1" ); test(0, "0" ); test(-1, "-1" ); } public static void test(int i, String exp) { if ((i >> 1) != (i >>> 1)) System.out.println(exp); } }

Select the two correct answers.

1. "1<<32"

2. "1<<31"

3. "1<<30"

4. "1"

5. "0"

6. "-1"

Which of the following are not operators in Java?

Select the two correct answers.

1. %

2. <<<

3. &

4. %=

5. >>>

6. <=

7. &&=

Given a variable x of type int (which may contain a negative value), which are correct ways of doubling the value of x , barring any wrapping of out-of-range intermediate values?

Select the four correct answers.

1. x << 1;

2. x = x * 2;

3. x *= 2;

4. x += x;

5. x <<= 1;

Which of the following operators can be used both as an integer bitwise operator and a boolean logical operator?

Select the three correct answers.

1. ^

2. !

3. &

5. ~

Given these declarations, which of the following expressions are valid?

byte b = 1; char c = 1; short s = 1; int i = 1;

Select the three correct answers.

1. s = b * 2;

2. i = b << s;

3. b <<= s;

4. c = c + b;

5. s += i;