java - 读取整数并找到最小值/最大值

Question

您将在下方找到一个 SSCCE。

我正在尝试输入一些整数，看看哪个是最大的和最小的。

当我运行/调试它时，只有第一个整数会得到代码来显示 System.out.println().....

import java.util.Scanner;

public class Comparison 
{

    public static void main(String[] args) 
    {

        Scanner input = new Scanner ( System.in );
        int a; //1st #
        int b; //2nd #
        int c; //3rd #
        int d; //4th #
        int e; //5th #
        int large = 0; //Largest #
        int small = 0; //Smallest #

        System.out.print( "Enter the first integer: ");
        a = input.nextInt();

        System.out.print( "Enter the second integer: ");
        b = input.nextInt();

        System.out.print( "Enter the third integer: ");
        c = input.nextInt();

        System.out.print( "Enter the fourth integer: ");
        d = input.nextInt();

        System.out.print( "Enter the fifth integer: ");
        e = input.nextInt();



        if ( a>b )
        {   large = a;

        if ( a<b )
            small = a;

        if ( a>c )
            large = a;

        if ( a<c )
            small = a;

        if ( a>d )
            large = a;

        if ( a<d )
            small = a;

        if ( a>e )
            large = a;

        if ( a<e )
            small = a;


        if ( b>a )

            large = b;

        if ( b<a )
            small = b;

        if ( b>c )
            large = b;

        if ( b<c )
            small = b;

        if ( b>d )
            large = b;

        if ( b<d )
            small = b;

        if ( b>e )
            large = b;

        if ( b<e )
            small = b;


        if ( c>b )

            large = c;

        if ( c<b )
            small = c;

        if ( c>a )
            large = c;

        if ( c<a )
            small = c;

        if ( c>d )
            large = c;

        if ( c<d )
            small = c;

        if ( c>e )
            large = c;

        if ( c<e )
            small = c;


        if ( d>b )

            large = d;

        if ( d<b )
            small = d;

        if ( d>c )
            large = d;

        if ( d<c )
            small = d;

        if ( d>a )
            large = d;

        if ( d<a )
            small = d;

        if ( d>e )
            large = d;

        if ( d<e )
            small = d;


        if ( e>b )

            large = e;

        if ( e<b )
            small = e;

        if ( e>c )
            large = e;

        if ( e<c )
            small = e;

        if ( e>d )
            large = e;

        if ( e<d )
            small = e;

        if ( e>a )
            large = e;

        if ( e<a )
            small = e;

        System.out.println(large + " is the largest number you have given.");
        System.out.println(small + " is the smallest number you have given.");
        }

    }

}

Answer 1

这可能是因为您有:

 if ( a>b )
 {   large = a;
     ...

作为您的第一个 if 语句，您最终将其关闭(大概是因为编译器告诉您缺少一个 }):

    System.out.println(large + " is the largest number you have given.");
    System.out.println(small + " is the smallest number you have given.");

    }  <------------

---

不过，这里有两种可供选择的解决方案:

....

large = Collections.max(Arrays.asList(a, b, c, d, e));
small = Collections.min(Arrays.asList(a, b, c, d, e));

....

---

另一个使用TreeSet:

Scanner input = new Scanner ( System.in );

TreeSet<Integer> integers = new TreeSet<Integer>();

System.out.print( "Enter the first integer: ");
integers.add(input.nextInt());

System.out.print( "Enter the second integer: ");
integers.add(input.nextInt());

System.out.print( "Enter the third integer: ");
integers.add(input.nextInt());

System.out.print( "Enter the fourth integer: ");
integers.add(input.nextInt());

System.out.print( "Enter the fifth integer: ");
integers.add(input.nextInt());

System.out.println(integers.last() + " is the largest number you have given.");
System.out.println(integers.first() + " is the smallest number you have given.");

A TreeSet可以存储元素并轻松检索最大和最小元素。