Input

Console input - Scanner

Some methods:

result Description
Scanner
new Scanner(System.in)  //конструктор
BigDecimal nextBigDecimal()
          Scans the next token of the input as a BigDecimal.

BigInteger nextBigInteger()
          Scans the next token of the input as a BigInteger.

BigInteger nextBigInteger(int radix)
          Scans the next token of the input as a BigInteger.

boolean nextBoolean()
          Scans the next token of the input into a boolean value and returns that value.

byte nextByte()
          Scans the next token of the input as a byte.

byte nextByte(int radix)
          Scans the next token of the input as a byte.

double nextDouble()
          Scans the next token of the input as a double.

float nextFloat()
          Scans the next token of the input as a float.

int nextInt()
          Scans the next token of the input as an int.

int nextInt(int radix)
          Scans the next token of the input as an int.

String nextLine()
          Advances this scanner past the current line and returns the input that was skipped.

long nextLong()
          Scans the next token of the input as a long.

long nextLong(int radix)
          Scans the next token of the input as a long.

short nextShort()
          Scans the next token of the input as a short.

short nextShort(int radix)
          Scans the next token of the input as a short.

String next()
Returns the next token from the scanner.
  
Example:
import java.util.*;

public class StdInputTest
{
   public static void main(String[] args)
   {
      Scanner in = new Scanner(System.in);

      // get first input
      System.out.print("What is your name? ");
      String name = in.nextLine();

      // get second input
      System.out.print("How old are you? ");
      int age = in.nextInt();

      // display output on console
      System.out.println("Hello, " + name + ". Next year, you'll be " + (age + 1));
   }
}

Popup dialog window - JOptionPane

Example:

import javax.swing.JOptionPane;

public class TestInp {

    public static void main( String[] args ){
       String name = "",s_age="";
       int age;
       name=JOptionPane.showInputDialog("Please enter your name");
       s_age=JOptionPane.showInputDialog("How old are You?");
       age=Integer.parseInt(s_age);
       String msg = "Hello " + name + " next year,you'll be " + (age + 1);

       JOptionPane.showMessageDialog(null, msg);
    }
}

Attention: JOptionPane.showInputDialog() - return a String as result

result	Description
Scanner	new Scanner(System.in) //конструктор
`BigDecimal`	`nextBigDecimal()` Scans the next token of the input as a `BigDecimal`.
`BigInteger`	`nextBigInteger()` Scans the next token of the input as a `BigInteger`.
`BigInteger`	`nextBigInteger(int radix)` Scans the next token of the input as a `BigInteger`.
`boolean`	`nextBoolean()` Scans the next token of the input into a boolean value and returns that value.
`byte`	`nextByte()` Scans the next token of the input as a `byte`.
`byte`	`nextByte(int radix)` Scans the next token of the input as a `byte`.
`double`	`nextDouble()` Scans the next token of the input as a `double`.
`float`	`nextFloat()` Scans the next token of the input as a `float`.
`int`	`nextInt()` Scans the next token of the input as an `int`.
`int`	`nextInt(int radix)` Scans the next token of the input as an `int`.
`String`	`nextLine()` Advances this scanner past the current line and returns the input that was skipped.
`long`	`nextLong()` Scans the next token of the input as a `long`.
`long`	`nextLong(int radix)` Scans the next token of the input as a `long`.
`short`	`nextShort()` Scans the next token of the input as a `short`.
`short`	`nextShort(int radix)` Scans the next token of the input as a `short`.
String	next() Returns the next token from the scanner.