[java]7、测试substring

/**
* @Description 测试substring
* @date 2016年3月2日  下午8:02:22
*/
public class testSubstring {
public static void main(String[] args) {

System.out.println("1:"+aaa("800880000048531"));
System.out.println("2:"+aaa("700460000048532"));

String No="800880000048531";
System.out.println("a="+No.substring(0, 1));
System.out.println("b="+No.substring(3));

}

private static String aaa(String No) {

int Count = 3;//随机数
Count++;

String No2=No.substring(0, 1) + (Count > 9 ? Count : "0" + Count)
+ No.substring(3);
return No2;
}
}