System.in Java Method Example

System.in Java Method Example

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In my previous post about simple hello world java program, I introduced System.in method.Today am going to show you how to use it to get input from a user.Pass the variable to another method that calculates the sum of the tentered bythe user.

How to use System.in Java method 

Execute below code

[

public class InputMethodExample {


    public static int sum;
    /**     * @param args the command line arguments     */  

          public static void main(String[] args) {
        // TODO code application logic here        

          Scanner scanner=new Scanner(System.in);
        System.out.println("Enter number 1");
        int num1=scanner.nextInt();
        System.out.println("Enter number 2");
        int num2=scanner.nextInt();

        doSum(num1,num2);
    }

    public static void doSum(int a,int b)
    {
        int number1=a;
        int number2=b;
        sum=number1+number2;

        System.out.println("The sum of the two numbers is "+sum);

    }

}

]

Few things to note:

1.Non static method cannot be accessed in another static method that the reason why doSum() method is static.

2.Non static variable cannot be accessed in a static method and that the reason why int sum is a static variable.

See also:

System.exit() Java Method uses