AP CS A Semester 1 Review

If String str has value "brouhaha", then the expression str.indexOf("ha") returns a value of 6.

• TRUE

• FALSE

The expression "baseball".substring(2) returns "seball".

• TRUE

• FALSE

If you wanted to check to see if two numerical values were equal, which operator would you use?

• =
• !=
• equals
• ==

To check if some integer x was evenly divisible by another integer y, which line of code would you use?

• if ( x / y = 0)
• if ( x / y == 0 )
• if ( x % y == 0 )
• if ( x % y = 0 )

To generate a random integer between 10 - 100, which line of code would you use?

• int randomInt = 10 + (int) ( Math.random() * ( ( 100 - 10 ) + 1 ) )
• int randomInt = 10 + (int) Math.random() * ( ( 100 - 10 ) + 1 ) 
• int randomInt = (int) ( Math.random(10, 100 )
• int randomInt = (int) ( Math.random(10, 100)  ) + 1

What would the result of this code be?
int x = 0;
while ( x < 5 )
{
System.out.print( "Hello" );
}

• It would print "Hello" 5 times
• It would print "Hello" 4 times
• It would print "Hello" an infinite number of times.
• It would print Hello once and then generate an error.

What does this operator mean?
||

• and
• or
• exclusive or
• not equal to

How do you print a tab character?

• System.out.print("\t");
• System.out.print("\tab");
• System.out.print("/t");
• System.out.print("/tab");

if  ((x || y) && x )
An equivalent statement to above would be:

• if (x)
• if (y)
• if (x || y)
• if (x && y)

For the following declarations:

String s1 = "hot";

String s2 = new String("hot");

the expression (s1 == s2) evaluates to true.

• TRUE

• FALSE