JAVA03- input and output

1, Output: System.out *.

　　* Println () is an abbreviation of the print line, and line represents an output;

　　* Print () indicates an output not wrap;

　　* Printf () indicates the output format, the formatting parameters represented by the placeholder;

Placeholder represents

Placeholder	Explanation
%d	Formatted output integer
%x	Formatted output hexadecimal integer
%f	Formatted output float
%e	Floating point numbers formatted output scientific notation
%s	Format string
%%	Itself represents one percent

 

2, type:

. 1  Package Test;
 2  // Import statement is introduced into a class, 
. 3  Import java.util.Scanner;
 . 4  
. 5  public  class Test01 {     // class name Test01 
. 6      public  static  void main (String [] args) {
 . 7                  / / create Scanner objects, passing System.in standard input stream. System.out represents the standard output stream. 
. 8          Scanner Scanner = new new Scanner (the System.in);
 . 9                  // printing tips 
10          of System.out.print ( "the Input your name:" );
 . 11                  //Reads and acquires a line of input character string, after the object has Scanner reads user input string using scanner.nextLine (); reads integer input by the user using scanner.nextInt (); Scanner automatically convert data types, therefore, no manual conversion. 
12 is          String name = scanner.nextLine ();
 13 is                  // printing tips 
14          of System.out.print ( "the Input your Age:" );
 15                  // read a line of input and acquires an integer of 
16          int Age = scanner.nextInt ();
 17                  // formatted output 
18 is          System.out.printf ( "the Hi,% S,% D you are \ n-" , name, Age);
 . 19          
20 is      }
 21 is  }
 22 is     

 

3. Summary:

　　JAVA output include: System.out.print () / printf () / println ();

　　JAVA objects Scanner provides easy input, reads the corresponding type can be used: scanner.nextLine () / nextInt () / nextDouble () / ......