Java uses the scanner class to get user input

When writing a program in Java, some data require user input, this time need to call Java provides scanner class, this class in the package java.util, such as to find a rectangular area, a simple look at the usage:

1 ImportJava.util.Scanner;2  Public classJavashuru {3     //Java gets user input, using the scanner class, in the Java.util package4      Public Static voidMain (string[] args) {5         //Create a Scanner object6Scanner input=NewScanner (system.in);7         DoubleA,b,s;//definition of long, wide, area8System.out.print ("Please enter the length of the rectangle:");9         //get input, and save to variableTenA=input.nextdouble (); OneSystem.out.print ("Please enter the width of the rectangle:"); Ab=input.nextdouble (); -s=a*b; -System.out.println ("The area of the rectangle is:" +S); theInput.close ();//Close Input -     } -}

This allows you to receive input from the user, note that the method of the input instance in this example nextdouble () is to get the floating-point value, and if you can get the string with next (), the integer can be used Nextint ()

The last sentence input.close (); Is to close the input, it is recommended to add this sentence, if you do not add eclipse will prompt: Resource leak: ' Input ' is never closed means a resource leak: the input is not closed, So when it's closed, the program runs and ends normally.

Java uses the scanner class to get user input