2.7 APCSA Vocab: Scanner Class

Existing classes and class libraries can be utilized as appropriate to create objects. One example of an existing class in Java is the Scanner class. The Scanner class is used to capture user input to use in program code. The Scanner class library is part of the java.util package and must be imported in order to be used.

nextInt()

returns the next integer

nextDouble()

returns the next double

nextBoolean()

returns the next boolean

next()

returns the next single string (stops at whitespace)

nextLine()

returns the next line as a string (stops at new line)

close()

void method that tells the program you are no  longer using the scanner

void setNums(int, int)

provide 2 integers as parameters.  The 2 numbers in Adder are set to those values.

void setFirst(int)

provide 1 integer as a parameter.  The first number in Adder is set to that value.

void setSecond(int)

provide 1 integer as a parameter.  The second number in Adder is set to that value.

int getSum()

The sum of the 2 numbers is calculated and returned.

void displaySum()

This method has no parameters and adds the two instance variables together and displays the sum.

Purpose of the Scanner Class

The Scanner class is used to capture user input to use in program code.