Java implementation of unsigned number conversion, string completion, MD5, UUID, random number of examples _java

Copy Code code as follows:

Package com.hongyuan.test;

Import Java.security.MessageDigest;
Import java.security.NoSuchAlgorithmException;
Import Java.util.Random;
Import Java.util.UUID;

/*
* Miscellaneous (unsigned number conversion, string completion, Md5,uuid, random number)
*/
public class Sundrytest {

Convert to unsigned number
public static number Tounsignednumber (number num) {
if (num instanceof Byte) {
return (Byte) Num & 0xff;
}else if (num instanceof short) {
return (short) Num & 0xffff;
}else if (num instanceof Integer) {
return (Integer) Num & 0xffffffffL;
}else{
return-1;
}
}
Left padded
public static string Leftpad (String str,string pad,int len) {
String newstr= (str==null? ": STR);
while (Newstr.length () <len) {
NEWSTR=PAD+NEWSTR;
}
if (Newstr.length () >len) {
Newstr=newstr.substring (Newstr.length ()-len);
}
return newstr;
}
Right padded
public static string Rightpad (String str,string pad,int len) {
String newstr= (str==null? ": STR);
while (Newstr.length () <len) {
Newstr=newstr+pad;
}
if (Newstr.length () >len) {
Newstr=newstr.substring (0, Len);
}
return newstr;
}

Md5
public static string MD5 (String str) {
StringBuilder sb=new StringBuilder ();
try {
MessageDigest digest = messagedigest.getinstance ("MD5");
Byte[] Message=digest.digest (Str.getbytes ());
for (int i=0;i<message.length;i++) {
Sb.append (Leftpad//left-padded
Integer.tohexstring (///turn into 16 number
(Integer) Tounsignednumber (Message[i]),//convert to unsigned number
"0", 2). toUpperCase ()); Turn into uppercase
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException ("There is no MD5 service!") ");
}
return sb.tostring ();
}
Uuid
public static String uuid () {
Return Uuid.randomuuid (). toString (). ReplaceAll ("-", ""). toUpperCase ();
}

Random number (including Min, excluding Max)
public static int random (int min,int max) {
if (Min<=max) {
Random random=new Random ();
Return Random.nextint (max-min) +min;
}else{
throw new IllegalArgumentException ("Unable to handle an illegal digital range!") ");
}

}

public static void Main (string[] args) {
System.out.println ("MD5 (123456):" +md5 ("123456"));
System.out.println ("UUID:" +uuid ());
System.out.println ("Random Number:" +random (1,100));
}

}