How to input and output in Java

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The first input method: scannerimport java.util.Scanner; / / Import java.util.Scannerpublic class User {public static void main (String [] args) {var sc = new Scanner (System.in); / / generate scanner object System.out.print ("Please enter your name:"); String name = sc.nextLine () / / enter the string System.out.print ("Please enter your age:"); int age = sc.nextInt (); / / enter the integer System.out.println ("name:" + name + "\ n" + "Age:" + age);}}

Running result

The commonly used next () method

NextInt () enter an integer

NextLine () input string

NextDouble () input double precision number

Next () input string with a space as a delimiter

The second input method: JOptionPane

Running result

The third input method: io.Console

This input method is a safe input method and can only be run in the cmd console, not in tools such as IDEA, eclipse, etc.

Create a User.java file

Import java.io.Console;// import java.io.Consolepublic class User {public static void main (String [] args) {Console con = System.console (); / / establish security input String name = con.readLine ("Please enter account:"); String passworld = con.readLine ("Please enter password:"); System.out.printf ("account:% s", name) System.out.printf ("% n password:% s", passworld);}}

Cmd goes to the directory where the file is located and runs the following instructions

Java-Dfile.encoding=UTF-8 User.java

Running result

Output method first output method: System.out.print ()

System.out.print () output directly without line wrapping

Public class User {public static void main (String [] args) {int a = 1; int b = 2; System.out.print (a); / / print () does not wrap the value of output a System.out.print (b); / / print () does not wrap the value of output b}}

Running result

twelve

The second output method: System.out.println ()

System.out.println () newline output

Public class User {public static void main (String [] args) {int a = 1; int b = 2; System.out.println (a); / / println () the value of the newline output a System.out.println (b); / / println () the value of the newline output b}}

Running result

one

two

The third output method: System.out.printf ()

System.out.printf () formatted output

Public class User {public static void main (String [] args) {int a = 1; int b = 2; System.out.printf ("a=%d%n", a); / / printf () formatted output System.out.printf ("baked% d", b); / / printf () formatted output}}

Running result

Axi1

Bread2

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