使用 if/else 语句比较两个数字

Question

我很难弄清楚如何使用 if/else 语句比较两个数字来确定哪个更大，哪个更小。

就目前而言，每当我编译我的代码时，我都会收到此错误：

类 NumberCompare 中的方法 setNums 不能赋予应用类型；必需：无参数，找到：int，int；原因：实际参数列表和形式参数列表的长度不同

我很确定我的课做得不好。这就是我目前拥有的。

NumberCompare类：

import static java.lang.System.*;

public class NumberCompare
{
    private int numberA, numberB;
    public NumberCompare(int a, int b)
    {
        numberA=a;
        numberB=b;
    }
    public void setNums ()
    {
        numberA = 45;
        numberB = 45;
    }
    public int getLargest ()
    {
        if(numberA > numberB)
            System.out.println(+numberA+" is greater than " +numberB);
        return numberA;
    }
    public int getSmallest ()
    {
        if(numberA < numberB)
            System.out.println(+numberB+" is less than " +numberA);
        return numberB;
    }
}

还有跑步者类：

import static java.lang.System.*;
public class NumberCompareRunner
{
    public static void main( String args[] )
    {
        NumberCompare test = new NumberCompare(5,6);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
        test.setNums(45,45);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
        test.setNums(-25,10324);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
    }
}

简而言之，我的问题是我无法将两个数字相互比较。感谢您的任何帮助。我也为我之前不成熟的发布这个问题深表歉意。

Answer 1

移除 setnums 方法并每次创建新对象：

import static java.lang.System.*;

public class NumberCompare
{
    private int numberA, numberB;
    public NumberCompare(int a, int b)
    {
        numberA=a;
        numberB=b;
    }
    public int getLargest ()
    {
        if(numberA > numberB)
            System.out.println(+numberA+" is greater than " +numberB);
        return numberA;
    }
    public int getSmallest ()
    {
        if(numberA < numberB)
            System.out.println(+numberB+" is less than " +numberA);
        return numberB;
    }
}

像这样使用它：

import static java.lang.System.*;
public class NumberCompareRunner
{
    public static void main( String args[] )
    {
        NumberCompare test = new NumberCompare(5,6);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
        test = new NumberCompare(45,45);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
        test = new NumberCompare(-25,10324);
        out.println(test);
        out.println("largest == " + test.getLargest());
        out.println("smallest == " + test.getSmallest()+"\n\n");
    }
}

Answer 2

您应该按如下方式创建您的 NumberCompare 类：

import static java.lang.System.*;

public class NumberCompare
{
    // Rest of the code here
    public void setNums (int a, int b){
        numberA = a;
        numberB = b;
    }
    public int getLargest (){
        if(numberA > numberB){
            System.out.println(+numberA+" is greater than " +numberB);
            return numberA;
        }
        else{
            System.out.println(+nuberB+" is greater than " +numberA);
            return numberA;
        }
    }
    public int getSmallest ()
    {
        if(numberA < numberB){
            System.out.println(+numberA+" is less than " +numberB);
            return numberA;
        }
        else{
            System.out.println(+numberB+" is less than " +numberA);
            return numberB;
        }
    }
}

您遇到的问题是由于 setNums 方法，不接受正确的参数。此外，我不禁注意到其余方法的实现错误，因此我也为这些方法提出了解决方案。 那是因为在您的原始代码中，您只检查 A 是否小于或大于 B，并且您返回 A，因为它不在 if 语句的代码块中。为每个 if 添加 else 语句并处理 B 是您的结果的情况相当容易。

Answer 3

按照定义设置数字的方法：

public void setNums ()
{
    numberA = 45;
    numberB = 45;
}

不允许用户指定新的。

更改签名以允许用户设置新号码：

public void setNums (int a, int b)
{
    numberA = a;
    numberB = b;
}