java - 我的 Java 数学运算出现错误？

Question

我创建了一个代码，该代码旨在接受用户输入，然后向其添加 5，这就是代码。当我输入任何数字时，它返回 0。编辑:我将 reCalculate 移到 main 下，没有任何变化

package files;
import java.util.*;
public class CalculatorTest {
static Scanner userFirstNumber = new Scanner(System.in);
static int numberReCalculated;

public static int reCalculate(int a){
int numberReCalculated = a + 5;
return numberReCalculated;
}
    public static void main(String[] args){
        int bobson;
        System.out.print("Enter a number, I will do the rest : ");
        bobson = userFirstNumber.nextInt();
        reCalculate(bobson);
        System.out.println(numberReCalculated);

    }



 }

Answer 1

您的 int numberReCalculated = a + 5; 声明遮盖了字段声明 static int numberReCalculated;。将 int numberReCalculated = a + 5; 更改为 numberReCalculated = a + 5;，或者将整个代码重写为惯用且有条理:

public class CalculatorTest {
    static Scanner userFirstNumber = new Scanner(System.in);

    public static int reCalculate(int a){
        return a + 5;
    }
    public static void main(String[] args){
        int input;
        System.out.print("Enter a number, I will do the rest : ");
        input = userFirstNumber.nextInt();
        int result = reCalculate(bobson);
        System.out.println(result);

    }
}

我不知道“bobson”如何成为一个描述性和自记录的变量名称。