import java.util.ArrayList;import java.util.Arrays;import java.util.Collection;import java.util.Collections;import java.util.List;import java.util.Random;public class CollectionsTest {? ??? ? public static Random ran = new Random();? ? public static List<Character> chars = new ArrayList<Character>();? ??? ? static{? ? for(int i=48;i<=57;i++){? ? chars.add((char)i);? ? }? ? for(int i=65;i<=90;i++){? ? chars.add((char)i);? ? }? ? for(int i=97;i<=122;i++){? ? chars.add((char)i);? ? }? ? System.out.println("隨機數字及字符串組成的數組：");? ? System.out.println(Arrays.toString(chars.toArray()));? ? System.out.println("========================");? ? }? ??? ? public static char getRandomchar(){? ? int index = ran.nextInt(chars.size());? ? return chars.get(index);? ? } public static String generateRandomStr(int length){ String str = ""; for(int i=0;i<length;i++){ str+=getRandomchar(); } return str; } public static List<String> generateRandomStrs(int num){ List<String> list = new ArrayList<String>(); int i=0; while(true){ String str = generateRandomStr(10); if(list.contains(str)){ continue; } list.add(str); i++; if(i == num){ break; } } return list; } public static void main(String[] args) { System.out.println("=============排序前================="); List<String> result = generateRandomStrs(10); for (String str : result) { System.out.println("輸出隨機數組："+str); } System.out.println("=============排序后================="); Collections.sort(result); for (String str : result) { System.out.println("輸出隨機數組："+str); } } }
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Leiky灬
TA貢獻10條經驗 獲得超0個贊
package?Test10_29;
import?java.util.ArrayList;
import?java.util.Arrays;
import?java.util.Collections;
import?java.util.List;
import?java.util.Random;
public?class?Test1?{
public?static?Random?ran?=?new?Random();
public?static?List<Character>?chars?=?new?ArrayList<Character>();
static?{
for?(int?i?=?48;?i?<=?57;?i++)?{
chars.add((char)?i);
}
for?(int?i?=?65;?i?<=?90;?i++)?{
chars.add((char)?i);
}
for?(int?i?=?97;?i?<=?122;?i++)?{
chars.add((char)?i);
}
System.out.println("隨機數字及字符串組成的數組：");
System.out.println(Arrays.toString(chars.toArray()));
System.out.println("========================");
}
public?static?char?getRandomchar()?{
int?index?=?ran.nextInt(chars.size());
return?chars.get(index);
}
public?static?String?generateRandomStr(int?length)?{
String?str?=?"";
for?(int?i?=?0;?i?<?length;?i++)?{
str?+=?getRandomchar();
}
return?str;
}
public?static?List<String>?generateRandomStrs(int?num)?{
List<String>?list?=?new?ArrayList<String>();
int?i?=?0;
while?(true)?{
//把生成str長度設置成隨機數
int?rand=(int)?(Math.random()*100);
String?str?=?generateRandomStr(rand);
if?(list.contains(str))?{
continue;
}
list.add(str);
i++;
if?(i?==?num)?{
break;
}
}
return?list;
}
public?static?void?main(String[]?args)?{
System.out.println("=============排序前=================");
List<String>?result?=?generateRandomStrs(10);
for?(String?str?:?result)?{
System.out.println("輸出隨機數組："?+?str);
}
System.out.println("=============排序后=================");
Collections.sort(result);
for?(String?str?:?result)?{
System.out.println("輸出隨機數組："?+?str);
}
}
}generateRandomStrs(int num)方法里面
把生成str長度設置成隨機數
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Avinan非常感謝！我試過了，OK噠！
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