Java Input & Output Statements
A Scanner class is used to enable a program to read i.e. numbers and strings. Before using a Scanner class, the program must import the package
A Scanner class to create and obtain input from command window is as follows:
Scanner input=new Scanner(System.in);.
The various methods of the scanner class are as follows:
- (i) int nextInt()
- (ii) double nextDouble()
- (iii) String next()
- (iv) String nextLine()
- (v) boolean hasNext()
- (vi) boolean hasNextDouble
(i) int nextInt()
Returns a integer value. The default value for a field of type int().
(ii) double nextDouble()
Returns a double value. The default value for a field of type double is 0.0 .
Read individual words. i.e., the method next reads the characters until a white space character such as a space, tab or new line is encountered, then return a string.(excluding the whitespace)
(iv) String nextLine()
Read a line of text. The methods nextLine read characters typed by the user until the newline character is encountered, then return a string(excluding the new line)
(v) boolean hasNext()
Determines whether there is another word in the input. The method hasNext returns the boolean value true if there is more data; otherwise, it returns false.
(vi) boolean hasNextInt()
Determines whether the next character sequence represents a floating point.
(vii) boolean hasNextDouble()
Determines whether the next chracter sequence represents a floatingpoint.
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