erc

The second statement works like this:

The final string could just as easily have been created with a single call:

str = str.substring(4,7);

The `indexOf()` Methods

There are four varieties of indexOf() in the Java library. Only the following may be included on the AP examination:

indexOf( String str ) Returns the index of the first occurrence of str or -1 if str is not found.

For example

String example = "The sea is calm to-night." ;
int location = example.indexOf( "sea" );

puts the value 4 into location. This

String example = "The sea is calm to-night." ;
int location = example.indexOf( "rats" );

puts the value -1 into location. This

What does the following put into location?

String example = "The sea is calm to-night." ;
int location = example.indexOf( "a" );

The indexOf() Methods