String string 0 common methods of operation

String pre-complement 0

String string 0 or space in Java

Method One: Write your own method

/*

* Number of low digits left 0
*
* @param str
* @param strlength
*/
public static string Addzerofornum (string str, int strlength) {
int strLen = Str.length ();
if (StrLen < strlength) {
while (StrLen < strlength) {
StringBuffer sb = new StringBuffer ();
Sb.append ("0"). Append (str);//left complement 0
Sb.append (str). Append ("0");//Right complement 0
str = sb.tostring ();
StrLen = Str.length ();
}
}

return str;
}

Can fill "0" can also fill ""

Method 2: You need to determine how much to fill 0.

public class P {
public static void Main (string[] args) {
String pattern= "000";
Java.text.DecimalFormat df = new Java.text.DecimalFormat (pattern);
int i = 10,j=6;
System.out.println ("i=" +df.format (i) + "\nj=" +df.format (j));
}
}
---------------------Output-----------------------
i=010
j=006

Method 3: Using regular efficiency is very low, it is recommended to find other ways

/**
* Java Digital to string in front of auto-complement 0 implementation.
*
* @author Lao Zi Research Laboratory (laozizhu.com)
*
*/
. public class Teststringformat {
public static void Main (string[] args) {
int younumber = 1;
0 on behalf of the preceding supplement 0
4 for length 4
D for parameter is positive type
String str = String.Format ("%04d", Younumber);
System.out.println (str); 0001
}

----------
String a = "1a95e2c2a6";
String pattern= "0000000000000000";
System.out.println (pattern.substring (0, Pattern.length ()-a.length ()) +a);

String string 0 common methods of operation