字符串排序（1）

package digit;

import java.util.Arrays;

public class String_Array_sort {

    public static String random_String()//生成随机字符串
    {
        char a[]  =  new char[5];
        for(int i = 0;i<a.length;i++)
        {
            while(true)
            {
                char c = (char)((Math.random()*(‘z‘-‘0‘+1))+‘0‘);
                if(Character.isDigit(c)||Character.isLetter(c))
                {
                    a[i] = c;
                    break;
                }
            }
        }
        String result = new String(a);
        return result;
        
        
        
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        String s[] = new String[8];//定义字符串数组
        for(int i = 0;i<s.length;i++)
        {
            s[i]=random_String();
        }
        System.out.println("原数组\n"+Arrays.toString(s));
        for(int i = 0;i<s.length;i++)  //冒泡排序
        {
            for(int j = 0;j<s.length-i-1;j++)
            {
                char c1  = s[j].charAt(0);     //用charAt方法获取字符串的首字母
                char c2  = s[j+1].charAt(0);
                
                c1 = Character.toLowerCase(c1);//用字符类的toLowerCase方法将字母转换为小写字母
                c2 = Character.toLowerCase(c2);
                if(c2<c1)
                {
                    String t;      //冒泡排序
                    t=s[j];
                    s[j]=s[j+1];
                    s[j+1]=t;
                }
            }
        }
         System.out.println("排序后的字符串数组");//输出排序后的数组
         System.out.println(Arrays.toString(s));
        
    }

}