Question

我有一些我需要帮助的功课。所以我不得不编写代码，其中给出了三个数字，并且通过使用if-else语句，我必须以正确的顺序显示它们。所以我认为我在使用数字的正确路径，但不知道如何使用字符串显示它。以下是我到目前为止所做的事情：

public class CS1702_Lab32 
{   
    static public void main(String args[])  
    {
        int a = 9, b = -10, c = -3;

    /* These are the six possible orders
     * abc
     * acb
     * bac
     * bca
     * cab
     * cba
     */

    if ( ( a <= b ) && ( b <= c ) )
    {
        System.out.println("The correct order is 'a'<='b'<='c'");
    }
    else if ( ( a <= c ) && ( c <= b ) )
    {
        System.out.println("The correct order is 'a'<='c'<='b'");
    }
    else if ( ( b <= a ) && ( a <= c ) )
    {
        System.out.println("The correct order is 'b'<='a'<='c'");
    }
    else if ( ( b <= c ) && ( c <= a ))
    {
        System.out.println("The correct order is 'b'<='c'<='a'");
    }
    else if ( ( c <= a) && ( a <= b ))
    {
        System.out.println("The correct order is 'c'<='a'<='b'");
    }
    else
    {
        System.out.println("The correct order is 'c'<='b'<='a'");
    }

    }
}

现在，我将如何按字母顺序对三个字符串执行相同的操作？我不认为我现在应该使用数组，因为工作表只是条件语句。如果有任何帮助，以下是工作表中的问题：

Write the Java code that will solve the following problems:

1. Given three numbers, displays them in the correct order (ascending)
2. Given three names (e.g. name1, name2 and name3 as string variables), display them in the correct alphabetical order

Answer 1

String.compareTo就是你想要的。

http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#compareTo%28java.lang.String%29

Answer 2

您可以使用Arrays.sort()：

int[] numbers = {-40, 2, -5};
Arrays.sort(numbers);
System.out.println(Arrays.toString(numbers));

String也是如此：

String[] names = {"Me", "You", "ABC"};
Arrays.sort(names);
System.out.println(Arrays.toString(names));

Answer 3

错误在于这种情况：

else if ( ( c <= b) && ( a <= b ))
    {
        System.out.println("The correct order is 'c'<='a'<='b'");
    }

通过此检查，您说：c和a小于或等于（<=）到b。其中，c可以大于或小于a。

应该{{1}}发言：else if ( ( c <= a) && ( a <= b ))和c <= a：a <= b

对于指定的问题，请尝试c <= a <= b。

Answer 4

 int[] num = {11, 2, 3};

 /*Convert the array into a list*/
   ArrayList<Integer> list = new ArrayList<Integer>(Arrays.aslist(num));

/*Sort the list*/
   Collections.sort(list);

/*Same for String*/ 
   String[] str = {"b", "a", "c"};
   Arryslist<String> list2 = new ARrayList<String>(Arrays.aslist(str));

/*Sort the list*/
  Collections.sort(list2);

如何以正确的顺序显示数字/字符串？

4 个答案: