在java中，如何从输入类调用值？

我不知道如何将一个变量从一个方法带到另一个方法中使用，特别是从输入类。例如，此测试程序不起作用。我该怎么做

下面是我的主要类（main.java）：

class Main
{
   public static void main(String args[])
   {
        Input f = new Input();
        f.inputting(num1, num2, num3);
   }
}

import java.io.*;

class Input
{
     void inputting(int number1, int number2, int number3)
   {
    Console d = System.console();

    String a = d.readLine("Enter 1st number:");
    String b = d.readLine("Enter 2nd number:");
    String c = d.readLine("Enter 3rd number:");

    int num1 = Integer.parseInt(a);
    int num2 = Integer.parseInt(b);
    int num3 = Integer.parseInt(c);

    Sort e = new Sort();
    e.sorting(num1, num2, num3);
   }
 }

class Sort
{
  void sorting(int number1, int number2, int number3)
  { 
  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

  if (number2 > number3) {
    int temp = number2;
    number2 = number3;
    number3 = temp;
  }

  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

   System.out.println("\nThe sorted numbers in ascending order are "
    + number1 + " " + number2 + " " + number3);
  }

  }

和我的输入类（input.java）：

class Main
{
   public static void main(String args[])
   {
        Input f = new Input();
        f.inputting(num1, num2, num3);
   }
}

import java.io.*;

class Input
{
     void inputting(int number1, int number2, int number3)
   {
    Console d = System.console();

    String a = d.readLine("Enter 1st number:");
    String b = d.readLine("Enter 2nd number:");
    String c = d.readLine("Enter 3rd number:");

    int num1 = Integer.parseInt(a);
    int num2 = Integer.parseInt(b);
    int num3 = Integer.parseInt(c);

    Sort e = new Sort();
    e.sorting(num1, num2, num3);
   }
 }

class Sort
{
  void sorting(int number1, int number2, int number3)
  { 
  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

  if (number2 > number3) {
    int temp = number2;
    number2 = number3;
    number3 = temp;
  }

  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

   System.out.println("\nThe sorted numbers in ascending order are "
    + number1 + " " + number2 + " " + number3);
  }

  }

和我的排序类（sort.java）：

class Main
{
   public static void main(String args[])
   {
        Input f = new Input();
        f.inputting(num1, num2, num3);
   }
}

import java.io.*;

class Input
{
     void inputting(int number1, int number2, int number3)
   {
    Console d = System.console();

    String a = d.readLine("Enter 1st number:");
    String b = d.readLine("Enter 2nd number:");
    String c = d.readLine("Enter 3rd number:");

    int num1 = Integer.parseInt(a);
    int num2 = Integer.parseInt(b);
    int num3 = Integer.parseInt(c);

    Sort e = new Sort();
    e.sorting(num1, num2, num3);
   }
 }

class Sort
{
  void sorting(int number1, int number2, int number3)
  { 
  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

  if (number2 > number3) {
    int temp = number2;
    number2 = number3;
    number3 = temp;
  }

  if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

   System.out.println("\nThe sorted numbers in ascending order are "
    + number1 + " " + number2 + " " + number3);
  }

  }

---

您正在使用

f.input（num1、num2、num3）将参数传递到
input

，但您从未在main中声明过

num1

、

num2

或

num3

---

如果您的目的是从

inputing

方法中进行用户输入，则不需要

inputing

方法的参数，因此您可以执行

f.inputing（）void input（）

这就是它应该做的

class Main
{
   public static void main(String args[])
   {
        int num1=1;
        int num2=2;
        int num1=3;
        Input f = new Input();
        f.inputting(num1, num2, num3);
   }
}

此外，如果！，您应该使用ELSE！，如果没有，它可以进入3个如果

if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

  else if (number2 > number3) {
    int temp = number2;
    number2 = number3;
    number3 = temp;
  }

  else if (number1 > number2) {
    int temp = number1;
    number1 = number2;
    number2 = temp;
  }

---

您需要设置子类或其他类使用的全局变量，也可以从类中调用该变量，如下所示：

班长

class Main
{
   public static void main(String args[])
   {
        Static int number1;
        Static int number2;
        Static int number3;

        Input f = new Input();
        f.inputting(number1, number2, number3);
  }
}

类输入

int Main.number1 = Integer.parseInt(a);
int Main.number2 = Integer.parseInt(b);
int Main.number3 = Integer.parseInt(c); 

---

为什么要将三个参数传递给

输入

？它们根本没有被使用。您正在发送包信息。它们在同一个包裹里吗？你犯了什么错误？此外，由于未定义main中的

num1

etc，因此此代码不会编译。