用于案例特定排序的Java程序

给定一个由大写和小写字符组成的字符串S。任务是分别对大写和小写字母进行排序，这样如果原始字符串中的第 i 个位置有一个大写字符，那么它在排序后就不应该有小写字符，反之亦然。如下图所示：

插图：

Input : srbDKi 
Output: birDKs
Processing : After sorting we have to place the lowercase characters to the lowercase and uppercase character to specific uppercase character 
 

方法：

1. 我们将使用两个ArrayList的一个小写值和第二存储来存储大写值。
2. 将元素添加到列表中后，我们将使用Collections.sort(list) 方法对列表进行排序
3. 排序后，我们将遍历字符串并检查 case-specific 并将元素存储在正确的位置

例子：

Java

// Java Program for Case Specific Sorting
// using Collections.sort(list) method
 
// Importing input output classes
// Importing utility classes
import java.io.*;
import java.util.*;
 
class GFG {
 
    // Method 1
    // To sort the string
    static String sortString(String str)
    {
        // Creating two Arraylist  class objects
        // Declaring object of character type
        ArrayList list = new ArrayList<>();
        ArrayList list2 = new ArrayList<>();
 
        // Initially the string is empty
        String res = "";
 
        // Iterating over the string
        for (int i = 0; i < str.length(); i++) {
            // Finding character at indexes
            // using charAt() method in List object
            if (str.charAt(i) >= 'a'
                && str.charAt(i) <= 'z')
                list.add(str.charAt(i));
 
            if (str.charAt(i) >= 'A'
                && str.charAt(i) <= 'Z')
                list2.add(str.charAt(i));
        }
 
        // Sorting the Collection interface
        // using sort() method
        Collections.sort(list);
        Collections.sort(list2);
 
        int i = 0;
        int j = 0;
 
        // iterating over string using length() method
        for (int k = 0; k < str.length(); k++) {
 
            // If lowercase character encountered
            if (str.charAt(k) >= 'a'
                && str.charAt(k) <= 'z') {
 
                // Appending them all in beginning of string
                res += list.get(i);
                ++i;
            }
 
            // If uppercase character encountered
            else if (str.charAt(k) >= 'A'
                     && str.charAt(k) <= 'Z') {
 
                // Appending them all together after
                // lowercase is finished in input string
                res += list2.get(j);
                ++j;
            }
        }
        return res;
    }
 
    // Method 2
    // Main driver method
    public static void main(String[] args)
    {
 
        // Passing the custom string as input for which we
        // want case-specific sorting by calling the method
        // 1 as defined above
        System.out.println(sortString("defRTSersUXI"));
    }
}

输出

deeIRSfrsTUX