Practice for 8th AP Java Quiz

A Java String is a

• primitive

• Object

• char

• bother

What is the output of this program?

• false true

• true false

• true true

• false false

Using + with Strings results in

• concatenation

• addition

• encapsulation

• an error

Which replacement for /* missing code */ would print abba?

• a+b+b+a

• b+a+a+b

• x+y+y+x

• y+x+x+y

Which of the following would return "x" for String s = new String("abcxcba")?

• s.substring(3)

• s.substring(4)

• s.substring(3,4)

• s.substring(4,5)

What is the output of this program?

• j

• the empty String

• abcdefghij

• error

Which replacement for /* missing code */ would print zy?

• s.substring(1,2)

• s.substring(0,2)

• str.substring(1,2)

• str.substring(0,2)

What is the output of this program?

• ijab

• hijabc

• hijab

• ijabc

Which of the following will correctly create a String variable that points to an empty String?

• String str = " ";

• String str = null;

• String str = '';

• String str = ''";

What is the output of this program?

• j

• the empty String

• abcdefghij

• error