Java生成随机字符串和随即生成10以内的字符串

private static int getRandom(int count) {

    　　return (int) Math.round(Math.random() * (count));

　　}

 

private static String string = "abcdefghijklmnopqrstuvwxyz";   

 

private static String getRandomString(int length){

    StringBuffer sb = new StringBuffer();

    int len = string.length();

    for (int i = 0; i < length; i++) {

        sb.append(string.charAt(getRandom(len-1)));

    }

    return sb.toString();

}




/**

*随即生成10以内的字符串 并排序 的核心代码

*/

public void testSort3(){ List<String> stringList = new ArrayList<String>(); 
String randomStr = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 
//输入10以内随机数 
Random random = new Random(); 
for(int i = 0; i < 10;i++){
StringBuilder builStr = new StringBuilder(); 
int sort = random.nextInt(10)+1;
//random生成的是类似[0,1),左包含又不包含的数，所以要+1
for(int j = 0;j < sort;j++){
char tempC = randomStr.charAt(random.nextInt(randomStr.length()));
builStr.insert(j, tempC);
}
String tempStr = builStr.toString(); 
stringList.add(tempStr);
}
System.out.println("-------排序前-------"); 
for(String string:stringList){ 
System.out.println("元素:"+string); 
} 
Collections.sort(stringList);
System.out.println("-------排序后-------"); 
for(String string:stringList){ 
System.out.println("元素:"+string); 
}
}