Question

我很难过，试图找出如何比较两个数字，以确定哪一个更大，哪一个更小，使用if / else语句。

就目前而言，每当我编译代码时，我都会收到此错误：

类NumberCompare中的方法setNums不能赋予应用的类型; required：没有参数，found：int，int;原因：实际和正式的参数列表长度不同

我很确定我的班级表现不佳。所以这就是我现在所拥有的。

ViewPager上课：

NumberCompare

跑步者班：

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;
    }
}

所以简而言之，我的问题是我无法将两个数字相互比较。感谢您的帮助。我也对此前不成熟的问题深表歉意。

Answer 1

您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。

更改签名以允许从用户设置新号码：

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

Answer 2

您应该按照以下方式更新您的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;
        }
    }
}

你遇到的问题是由于setNums方法，而不是接受正确的参数。我也忍不住注意到其他方法的错误实现，所以我也提出了一个解决方案。这是因为在您的原始代码中，您只检查A是小于还是大于B并且您返回A，因为它不在if语句的代码块中。为每个if添加一个else语句并处理B是你的结果的情况相当容易。

Answer 3

每次删除setnums方法并创建新对象：

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：

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");
    }
}

使用if / else语句比较两个数字

3 个答案: