个回答

• 暗能量PK暗物质

  2020-08-23 15:31:16

  package collection;

  
  

  import java.util.Random;

  import java.util.Scanner;

  import java.util.ArrayList;

  import java.util.Collections;

  import java.util.List;

  
  

  public class randomString {

  
  

  
  

  private static final Exception OutException = new Exception("超出范围");

  
  

  
  

  
  

  public static void main(String[] args) {

  // TODO Auto-generated method stub

  try {

  Scanner input = new Scanner(System.in);

  System.out.println("请输入数组个数1~29的数字：");

  int num = input.nextInt();

  List <Integer> size = randSize(num);

  List <String> arry = randString(size);

  System.out.println("----------排序前------------");

  for (String i : arry) {

  System.out.println("第"+((int)arry.indexOf(i)+1)+"行："+i);

  }

  System.out.println("--------排序后---------");

  Collections.sort(arry);

  for (String i : arry) {

  System.out.println("第"+((int)arry.indexOf(i)+1)+"行："+i);

  }

  }catch(Exception e) {

  System.out.println(e);

  }

  }

  
  

  
  

  //生产随机长度

  public static List<Integer> randSize(int size) throws java.lang.Exception  {

  //创建数值类 泛型 Integer

  List <Integer> sizeOfStr = new ArrayList<Integer>();

  //创建 random 对象 randSize

  Random randsize = new Random();

  //10以内随机值赋值给sizeOfStr数组，个数为size

  int k;

  if (size >= 30 || size < 1) {

  throw OutException;

  }

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

  do {

  k = randsize.nextInt(30);

  }while(sizeOfStr.contains(k)||k==0);

  sizeOfStr.add(k);

  }

  System.out.println(sizeOfStr);

  return sizeOfStr;

  }

  //产生字符串

  public static List <String> randString(List randSize ) {

  List <String> randStr = new ArrayList <String>();

  Random randChar = new Random();

  for(int i = 0 ; i < randSize.size(); i++) {

  //每一组赋值

  StringBuilder randChr  = new StringBuilder();

  for(int j = 0 ; j < (int)randSize.get(i); j++ ) {

  randChr.append((char)(Math.abs(randChar.nextInt())%(127 -32 +1)+32));

  }

  randStr.add(randChr.toString());

  }

  return randStr;

  }

  
  

  }

  
  

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