Question

我根据书中的说明编写了一个关于扫描仪的程序，但它无法编译。由eclipse提供的解释是nextint（）未定义。我不知道如何定义nextint（）。任何人都可以帮忙我呢？

import java.util.Scanner;
    public class ReadTwoNums{
        public static void main(String[] args){
        int num1,num2,sum;
        Scanner keyboard=new Scanner(System.in);
        System.out.print("Input the first the integer");
        num1=keyboard.nextint();
        System.out.print("Input the second the integer");
        double dollars=keyboard.nextDouble();
        num2=keyboard.nextint();
        sum=num1+num2;
        System.out.println("The sum is"+sum);
        }
    }


Exception in thread "main" java.lang.Error: Unresolved compilation  problems: 
The method nextint() is undefined for the type Scanner
The method nextint() is undefined for the type Scanner

at exercise.ReadTwoNums.main(ReadTwoNums.java:8)

Answer 1

nextInt（）区分大小写

尝试keyboard.nextInt（）;

Answer 2

Java区分大小写

它应该是Keyboard.nextInt()而不是nextint（）。就像你在keyboard.nextDouble()

中所做的那样

    import java.util.Scanner;
    public class ReadTwoNums{
        public static void main(String[] args){
        int num1,num2,sum;
        Scanner keyboard=new Scanner(System.in);
        System.out.print("Input the first the integer");
        num1=keyboard.nextInt();
        System.out.print("Input the second the integer");
        double dollars=keyboard.nextDouble();
        num2=keyboard.nextInt();
        sum=num1+num2;
        System.out.println("The sum is "+sum);
        }
    }//end of class ReadTwoNums

如何为类型扫描程序定义方法nextint（）

2 个答案: