AP Computer Science - String Class (w/ Substring practice)

What method is used to compare two strings?

compareTo()

"foxtrot".substring( 0, 0 ) What is returned by substring?

"" (the empty string)

"foxtrot".substring( 0, 1 ) What is returned by substring?

"f"

"foxtrot".substring( 3, 5 ) What is returned by substring?

"tr"

int test = "fox".compareTo( "fox" ); What is the value of test?

0

"foxtrot".substring( 5, 6 ).length() What is returned by length?

1

"foxtrot".substring( 3, 5 ).length() What is returned by length?

2

int letterNum = 1+ "tictactoe".indexOf( 'c' ) What does letterNum equal?

3

"tictactoe".indexOf( 'a' ) What is returned by indexOf?

4

Consider this method, called test: boolean test( String str ) { return str == "fox" ); } If str contains "fox", will the method return true?

Unpredictable.. == compares the memory location in which Strings are stored, so it would probably return false, but when it sees "fox", it might say , Oh - I already have that string in the str location, so I'll just point to that.. thus the method would return true.

int test = "fox".compareTo( "Fox" ); What is the approximate value of test?

greater than 0

int test = "fox".compareTo( "Hen" ); What is the approximate value of test?

greater than 0

What are the signatures of the two overloads of the substring method?

substring( int, int ) substring( int )

int test = "hen".compareTo( "fox" ); What is the value of test?

+2

int x = "tictactoe".indexOf( 'T' ) What does x equal?

-1

int test = "fox".compareTo( "hen" ); What is the value of test?

-2

"foxtrot".substring( 4, 4 ).length() What is returned by length?

0

"tictactoe".indexOf( 't' ) What is returned by indexOf?

0

"tictactoe".indexOf( 'e' ) What is returned by indexOf?

8

"foxtrot".substring( 0 ) What is returned by substring?

"foxtrot"

"foxtrot".substring( 3 ) What is returned by substring?

"trot"

"foxtrot".substring( 2, 6 ) What is returned by substring?

"xtro"

What method is used to find the length of a string?

length()

int test = "Hen".compareTo( "fox" ); What is the approximate value of test?

less than 0

String str = "Mocha"; int len = str.length; What will happen?

The code will not compile. To access the length property of a String object, you must use the length() method. Note: You can access the length property of an array directly... int len = arr.length;