我的作業(yè)，，
public void testSort3() {
List<String> stringList =new? ArrayList<String>();
String k;
for(int i = 0; i< 10; i++) {
do {
k = generateString(10);
}while(stringList.contains(k));
stringList.add(k);
}
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);
}
}
/**
* 返回隨機(jī)字符串方法
* @param args
*/
?public static String generateString(int length) //參數(shù)為返回隨機(jī)數(shù)的長(zhǎng)度?
{?
StringBuffer sb = new StringBuffer();?
Random random = new Random();?
Random random2 =new Random();
int j;
j= random2.nextInt(length);
for (int i = 0; i < j; i++)?
{?
j= random2.nextInt(length);
sb.append(allChar.charAt(random.nextInt(allChar.length())));?
}?
return sb.toString();?
}?
2019-02-23
package?com.imooc.collection;import?java.util.ArrayList;import?java.util.Collections;import?java.util.List;import?java.util.Random;public?class?CollectionsTest?{ public?List<Integer>?listInteger; public?CollectionsTest()?{ this.listInteger?=?new?ArrayList<Integer>(); } public?void?testSortInteger()?{ Random?random?=?new?Random(); Integer?k; for?(int?i?=?0;?i?<?10;?i++)?{ do?{ k?=?random.nextInt(100); }?while?(listInteger.contains(k)); listInteger.add(k); System.out.println("成功添加整數(shù)："?+?k); } System.out.println("------------排序前----------------------"); for?(Integer?integer?:?listInteger)?{ System.out.println("元素："?+?integer); } Collections.sort(listInteger); System.out.println("------------排序后----------------------"); for?(Integer?integer?:?listInteger)?{ System.out.println("元素："?+?integer); } //?listInteger.sort(c); } public?String??productString(int?strLength)?{ Random?random?=?new?Random(); Integer?k; String?stringSource?="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; String?temp?=?""; for(int?i?=?0;i?<?strLength;i++)?{ k?=?random.nextInt(62);????????????temp?+=?stringSource.charAt(k); } return?temp; } public?void?testSortString()?{ List<String>?listString?=?new?ArrayList<String>(); String?s?=?""; for(int?i?=?0;i?<?10;i++)?{ do?{ s?=?productString(10); listString.add(s); System.out.println("成功添加字符串："+s); }while(!(listString.contains(s))); } System.out.println("-------------排序前----------------"); for?(String?string?:?listString)?{ System.out.println("元素："+string); } Collections.sort(listString); System.out.println("-------------排序后----------------"); for?(String?string?:?listString)?{ System.out.println("元素："+string); } } public?static?void?main(String[]?args)?{ //?TODO?Auto-generated?method?stub CollectionsTest?st?=?new?CollectionsTest(); //st.testSortInteger(); st.testSortString(); }}