/**
* 随機數、字母 工具類
* Created by admin on 2017/2/20.
*/
public class RandomUntil {
/**
* 生成一個0 到 count 之間的随機數
* @param endNum
* @return
*/
public static int getNum(int endNum){
if(endNum > 0){
Random random = new Random();
return random.nextInt(endNum);
}
return 0;
}
/**
* 生成一個startNum 到 endNum之間的随機數(不包含endNum的随機數)
* @param startNum
* @param endNum
* @return
*/
public static int getNum(int startNum,int endNum){
if(endNum > startNum){
Random random = new Random();
return random.nextInt(endNum - startNum) + startNum;
}
return 0;
}
/**
* 生成随機大寫字母
* @return
*/
public static String getLargeLetter(){
Random random = new Random();
return String.valueOf ((char) (random.nextInt(27) + 'A'));
}
/**
* 生成随機大寫字母字元串
* @return
*/
public static String getLargeLetter(int size){
StringBuffer buffer = new StringBuffer();
Random random = new Random();
for(int i=0; i<size;i++){
buffer.append((char) (random.nextInt(27) + 'A'));
}
return buffer.toString();
}
/**
* 生成随機小寫字母
* @return
*/
public static String getSmallLetter(){
Random random = new Random();
return String.valueOf ((char) (random.nextInt(27) + 'a'));
}
/**
* 生成随機小寫字母字元串
* @return
*/
public static String getSmallLetter(int size){
StringBuffer buffer = new StringBuffer();
Random random = new Random();
for(int i=0; i<size;i++){
buffer.append((char) (random.nextInt(27) + 'a'));
}
return buffer.toString();
}
/**
* 數字與小寫字母混編字元串
* @param size
* @return
*/
public static String getNumSmallLetter(int size){
StringBuffer buffer = new StringBuffer();
Random random = new Random();
for(int i=0; i<size;i++){
if(random.nextInt(2) % 2 == 0){//字母
buffer.append((char) (random.nextInt(27) + 'a'));
}else{//數字
buffer.append(random.nextInt(10));
}
}
return buffer.toString();
}
/**
* 數字與大寫字母混編字元串
* @param size
* @return
*/
public static String getNumLargeLetter(int size){
StringBuffer buffer = new StringBuffer();
Random random = new Random();
for(int i=0; i<size;i++){
if(random.nextInt(2) % 2 == 0){//字母
buffer.append((char) (random.nextInt(27) + 'A'));
}else{//數字
buffer.append(random.nextInt(10));
}
}
return buffer.toString();
}
/**
* 數字與大小寫字母混編字元串
* @param size
* @return
*/
public static String getNumLargeSmallLetter(int size){
StringBuffer buffer = new StringBuffer();
Random random = new Random();
for(int i=0; i<size;i++){
if(random.nextInt(2) % 2 == 0){//字母
if(random.nextInt(2) % 2 == 0){
buffer.append((char) (random.nextInt(27) + 'A'));
}else{
buffer.append((char) (random.nextInt(27) + 'a'));
}
}else{//數字
buffer.append(random.nextInt(10));
}
}
return buffer.toString();
}
}