import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class CollectionTest {
	public void sortString2() {
		String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";//定义一个包含所有字母数字的字符串，总共61个字符
		List<String> strList = new ArrayList<String>();
		Random r = new Random();
		for (int i = 0; i < 10; i++) {
			StringBuilder s = new StringBuilder();
			int len = r.nextInt(10);//每条字符串的长度为10以内的整数
			for (int j = 0; j < len; j++) {
			//每条字符串的每个字符为随机生成
				int t = r.nextInt(62);//随机生成62以内的整数
				s.append(str.charAt(t));//找到str中t位置的字符

			}
			strList.add(s.toString());//将StringBuilder对象转换为String对象
		}
		//输出排序前结果
		for (String string : strList) {
			System.out.println(string);

		}
		Collections.sort(strList);
		System.out.println("排序后");
		for (String string : strList) {
			System.out.println(string);

		}

	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		CollectionTest ct = new CollectionTest();
		ct.sortString2();
	}

}

执行结果：

xt6Xm
FqVwPrIR
R
bZ1xnp
IDrWbLuO
H5VUKfwNl
veU
lPoNu
RE9Q7K
EX7u5rZu
排序后
EX7u5rZu
FqVwPrIR
H5VUKfwNl
IDrWbLuO
R
RE9Q7K
bZ1xnp
lPoNu
veU
xt6Xm