字符串的合并处理

import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
String str_1= sc.next();
String str_2 = sc.next();
String str = str_1+str_2;
//使用字符串，将转换关系对应如下
String st1 = "abcedfABCEDF0123456789";
String st2 = "5D37BF5D37BF084C2A6E19";
System.out.println(strChange(strSort(str),st1,st2));

    }
}
//字符串转换函数，将排序好的字符串进行相应转换
public static String strChange(String str,String s1,String s2){
    char data[] = str.toCharArray();
    for(int i = 0;i<data.length;i++){
        if('0'<=data[i]&&data[i]<='9'||'A'<=data[i]&&data[i]<='F'||'a'<=data[i]&&data[i]<='f'){
            for(int j=0;j<s2.length();j++){
                if(data[i]==s1.charAt(j)){
                    data[i]=s2.charAt(j);
                    break ;
                }
            }
        }
    }
    return new String(data);
}
//使用两个数组存储按奇数偶数排序后的两个字符数组
public static String strSort(String str){
    char data1[] = new char[str.length()];
    char data2[] = new char[str.length()];
    String sb = "";
    int j=0;
    int m=0;
    for(int i = 0;i<str.length();i++){
        if(i%2==0){
            data1[j++]=str.charAt(i);
        }else if(i%2==1)
            data2[m++]=str.charAt(i);
    }
    Arrays.sort(data1);
    Arrays.sort(data2);
    for(int i = 0;i<str.length();i++){
        sb+=(i%2==0)?data1[m++]:data2[j++];
    }
    return sb;
}

}