String 方法 替换 随机数

import java.util.ArrayList;
import java.util.Random;



public class Tes {

    /**
     * @param args
     *
     *
     */
    public void Test() {
        String delims = "X";
        String ss = "2008XXX8";
        String x = "1";
        String dd[] = ss.split(delims);
        for (String me : dd) {
            delims = x;
            System.out.println(me);
        }
    }

    public void test1() {
        String testStr = "2008XXX8";
        // System.out.println(testStr.substring(0, 8));


        // 第几位字符替换

        int position = 5;

        if (testStr.length() > 2) {
            testStr = testStr.substring(0, position - 1) + "A"
                    + testStr.substring(position);
            //     System.out.println(testStr.substring(0, position-1));

            //     System.out.println( testStr.substring(position));

            System.out.println(testStr);
        }

    }

    public void Test2() {
        String delims = "X";
        String ss = "2008XXX8";
        int count = ss.length() - ss.replace(delims, "").length(); //判断出现变量数

        System.out.println(count);
        System.out.println(ss.length());
        System.out.println(ss.replace(delims, "").length());
        for (int i = 0; i < 5; i++) {

            Random rdm = new Random(); //创建随机对象


            String x = null;
            int c = (rdm.nextInt() >>> 1) % 10;//1---10

            x = String.valueOf(c);
            String dd = ss.replace(delims, x);//替换

            System.out.println(dd);
            for (int j = 1; j < count; j++) {

            }

        }
        //字符窜复制

        //     String tt;

        // tt= ss.strRep("aaa",5);


    }

    public void test3() {
        String delims = "X";
        String ss = "2008XXX8";
        int count = ss.length() - ss.replace(delims, "").length(); //判断出现变量数

        System.out.println(count);
        System.out.println(ss.length());
        System.out.println(ss.replace(delims, "").length());
        for (int i = 0; i < 5; i++) {

            Random rdm = new Random(); //创建随机对象


            String x = null;
            int c = (rdm.nextInt() >>> 1) % 10;//1---10

            x = String.valueOf(c);
            String dd = ss.replace(delims, x);//替换

            System.out.println(dd);
            for (int j = 1; j < count; j++) {

            }

        }

    }

    public void test4() {
        String testStr = "2008XXX8";
        String delims = "X";

        for (int s = 0; s < 3; s++) {
           for(int i = 0;i<2;i++)
           {
             if (testStr.length() > 2) {
                   int count = testStr.replace(delims, "").length();
                   int position = count;
                   if(position !=0)
                   {
                       Random rdm = new Random(); //创建随机对象

                       String x = null;
                       int c = (rdm.nextInt() >>> 1) % 10;//1---10

                       x = String.valueOf(c);
                       testStr = testStr.substring(0, position - 1) + x
                               + testStr.substring(position);
                       
                    }
                   
                }
                System.out.println(testStr);
           }
            
        
            //     if(position !=0)

            //     {

            //         for(int i=0;i<5;i++)

            //            {


            // }

            // }


        }
    }
public void test5()
{
    for(int i=0;i<5;i++)
    {
         Random rd = new Random(); //创建随机对象

         String n="";
         //String num1="";

         int rdGet; //取得随机数

         do{
         rdGet=Math.abs(rd.nextInt())%10+48; //产生48到57的随机数(0-9的键位值)

         //rdGet=Math.abs(rd.nextInt())%26+97; //产生97到122的随机数(a-z的键位值)

         char num1=(char)rdGet;
         String dd=Character.toString(num1);
         n+=dd;
        
         }while(n.length()<3);//假如长度小于3

        
    
        // System.out.println("请输入3位随机数："+n);

         String testStr = "2008XXX8";
            String delims = "X";
         int count = testStr.replace(delims, "").length();//判断第几个是X

         int count1 = testStr.length() - testStr.replace(delims, "").length(); //判断出现变量数

         int position = count;
            
                testStr = testStr.substring(0, position - 1) + n
                        + testStr.substring(7);
                System.out.println(testStr);
        
    }
    
            
        

            

    
}

    public static void main(String[] args) {

        Tes t = new Tes();
        //    t.Test();

        //        t.test1();

        //        t.Test2();

    //    t.test3();

    //    t.test4();

        t.test5();

    }

}