Java比较器排序不同

Question

public static void main(String[] args) {
    String[] a = {"abc9", "abc", "abc123", "ab9"};
    String[] b = {"abc9", "abc", "abc123", "ab9"};
    String[] c = {"abc9", "abc", "abc123", "ab9"};

    System.out.print("a_Origin     : ");
    printArray(a);
    System.out.print("c_Origin     : ");
    printArray(c);

    System.out.print("a_Default    : ");
    Arrays.sort(a);
    printArray(a);

    System.out.print("c_Default    : ");
    Arrays.sort(c);
    printArray(c);

    System.out.print("a_Customized1: ");
    Arrays.sort(a, new StringComparator());
    printArray(a);

    System.out.print("b_Customized1: ");
    Arrays.sort(b, new StringComparator());
    printArray(b);

    System.out.print("c_Customized2: ");
    Arrays.sort(c, new StringComparator2());
    printArray(c);
}

public static void printArray(String[] arr){
    for (String str: arr) {
        System.out.print(str + " ");
    }
    System.out.println();
}

@Override
public int compare(String s1, String s2) {
    if(s1.length() == s2.length()){
        if(s1.equals(s2))
            return 0;
        else{
            for(int i = 0; i < s1.length(); i++){
                if(s1.charAt(i) > s2.charAt(i)){
                    return 1;
                }else {
                    return -1;
                }
            }
            return 0;
        }
    }else if(s1.length() < s2.length()){
        return -1;
    }else{
        return 1;
    }
}

@Override
public int compare(String s1, String s2) {
    if (s1.length() == s2.length()) {
        for (int i = 0; i < s1.length(); i++) {
            if (s1.charAt(i) > s2.charAt(i)) {
                return 1;
            } else if (s1.charAt(i) < s2.charAt(i)) {
                return -1;
            }
        }
        return 0;
    } else if (s1.length() < s2.length()) {
        return -1;
    } else {
        return 1;
    }
}

“StringComparator”在“arrays.sort（b,new StringComparator（））；”出货量和预期的一样。

但当我使用默认排序（步骤如下），然后按“StringComparator”排序时，bug显示：

“Arrays.Sort(a)；Arrays.Sort（a,new StringComparator（））；”

Answer 1

这起作用了-在StringComparator类中进行比较-

public int compare(String s1, String s2) {
        if(s1.length() == s2.length()){
            if(s1.equals(s2))
                return 0;
            else{
                for(int i = 0; i < s1.length(); i++){
                    if(s1.charAt(i) != s2.charAt(i)) {
                        return s1.charAt(i) - s2.charAt(i);
                    }
                }
            }
        }
        return s1.length() - s2.length();
    }

首先使用默认排序，然后使用自定义比较器(a_customated)排序的数组，给出的结果与使用自定义比较器(b_customated)的结果相同

旧代码的问题似乎在这里-

 if(s1.charAt(i) > s2.charAt(i)){
    return 1;
 }else {
    return -1;
 }