The day07_Java self Java class Scanner

Scanner Class Profile

A scanner can resolve simple text strings and basic types. Scanner class features: keyboard input data can be achieved, to program them.

Reference types using the steps

1: package guide

Using the import keyword leader packet, until all code packet type conductivity, the introduction of the type of format to be used:

note:

• If you need to use the target class, and the current class in the same package, the package may be omitted guide statements are not written.
• The only java.lang package contents do not need to guide package, other packages require an import statement.

2: Create Object

Using the constructor method of the class, create an object class. format:

3: Call

• Call to a member method of the class, complete the assigned functions. Format: variable name method name ();.
• Call member variables of the class, gets the specified value. Format: variable name member variable name;

Scanner using the steps

View class

• java.util.Scanner: after introduction of such use need to import.

View constructor

• public Scanner (InputStream source): Constructs a new Scanner, produces values ​​specified from the input stream is scanned. Parameter input from the keyboard as the representative System.in

View member method

• public int nextInt (): the input of the next scanning information marker as an int value. (Int get a numeric keyboard input)
• public String next (): the input of the next scan marker information to a String. (String get a numeric keyboard input)

demand

Int three digital keyboard input, then the highest value is obtained.

analysis:

1: Since it is a keyboard input, definitely you need to use the Scanner
2.:Scanner three steps: guide package, create, use nextInt () method
3: Since it is three digits, then called three times nextInt () method to obtain a three int variable
4: who can not simultaneously determine the maximum three digits, to be converted into two steps:
　　4.1 first determine who was the greatest among the first two, the first two to get the maximum value of
　　a maximum of 4.2 took the first two, and then the third number is obtained by comparing the maximum value from among the three numbers
5: final results of printing

Code

public  class Demo03ScannerMax { 

    public  static  void main (String [] args) {
         // create Scanner objects Note: Representative System.in input from the keyboard 
        Scanner SC = new new Scanner (System.in); 

        // Get int numeric keyboard input 
        System .out.println ( "Please enter the first digit:" );
         int a = sc.nextInt (); 
        System.out.println ( "Please enter the second number:" );
         int B = sc.nextInt () ; 
        System.out.println ( "Please enter the third number:" );
         int C = sc.nextInt (); 

        // first among the first two digits give the maximum 
        int? TEMP = A> B A: B;
         int max = TEMP> C? TEMP: C; 
        System.out.println ( "maximum is:" + max); 
    } 

}

Results of the