Java混合字符串词，使用boolean进行检查

Question

public class Test{                                      
  public static boolean s(String one, String two, String three){                                        
    int[] array = new int[30];                                      
    for (char c : three.toCharArray()) {                                        
      array[c - 97]++;                                      
    }                                       
    for (char c : two.toCharArray()){                                       
      array[c - 97]--;                                      
    }                                       
    for(char c : one.toCharArray()){                                        
      array[c - 97]--;                                      
    }                                       
    for (int value : array){                                        
      if (value > 0){                                       
        return false;                                       
      }                                     
    }                                       
    return true;                                        
  }                                     
}    

Main

public class Main                                       
{                                       
  public static void main(String[] args)                                        
  {                                                                             
    System.out.println(Test.s("test","now","tesntow"));       //true                                                                     
    System.out.println(Test.s("test","here","testhere"));    //false  
    System.out.println(Test.s("test","here","tehstere"));          //true                                                                
    System.out.println(Test.s("test","new","tesntewword"));      //false                                                                                     
  }                                     
}

I am trying to return and output where if one or two's value is the same as three, it would return true, else false. However, my output is always true, when it should be true, false, true and false. Is it because it is only checking for same letters in each string so it returns true?

Answer 1

I have made a different approach to your problem. Refer to the code comments for details.

Code:

public class Main2 {

    static int counter = 0;

    public static void main(String[] args) {
        System.out.println(s("test", "now", "tesntow")); // true
        System.out.println(s("test", "here", "testhere")); // false
        System.out.println(s("test", "here", "tehstere")); // true
        System.out.println(s("test", "new", "tesntewword")); // false
    }

    public static boolean s(String one, String two, String three) {
        String combined = one + two; // combine the two words
        combined = combined.toLowerCase(); // convert to lowercase
        three = three.toLowerCase(); // convert to lowercase

        // check if it has the same length, if not then return false
        // check if it is the same, if it is then return false
        if (combined.length() != three.length() || combined.equals(three)) {
            return false;
        }

        // iterate through the combined words
        for (int i = 0; i < combined.length(); i++) {
            // declare and initialize a flag
            boolean flag = false;

            // check if the current letter of the combine word is in the third word
            flag = three.contains(combined.charAt(i) + ""); // just add empty string to make it a string (Brute force)
            if (!flag) {
                return false;
            }

            // remove the letter from the third word
            int j = three.indexOf(combined.charAt(i));
            three = three.substring(0, j) + three.substring(j);
        }
        return true;
    }
}

Result:

true
false
true
false