长度10以内的10个不同长度的字符串
杀手cool
2019-01-05 14:10
package src.com.cg;
import java.util.*;
public class ListSort {
public static void main(String[] args) {
//定义一个字符串包含 数字和字母
String str = "zxcvbnmlkjhgfdsaqwertyuiopQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
List<String> list = new ArrayList<>();
ListSort sort = new ListSort();
//添加元素
sort.add(str, list);
System.out.println(list.size());
for (String s : list) {
System.out.println("排序前的字符串是" + s);
}
Collections.sort(list, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
return o1.length() - o2.length();
}
});
for (String s : list) {
System.out.println("排序后的字符串是:" + s);
}
}
private void add(String str, List<String> list) {
Random random = new Random();
do {
StringBuilder sb = new StringBuilder();
// 随机生生成一个10以内的长度
int i = random.nextInt(11);
//用这个长度去循环遍历生成该长度的字符串
for (int i1 = 0; i1 < i; i1++) {
int i2 = random.nextInt(62);
sb.append(str.charAt(i2));
}
//过滤掉空字符串和重复的字符串
if (!sb.toString().isEmpty() && (!list.contains(sb.toString()))) {
//保证每个元素的长度都是不一样的
if (list.isEmpty()) {
list.add(sb.toString());
} else {
boolean flag = false;
for (int i4 = 0, length = list.size(); i4 < length; i4++) {
if ((list.get(i4).length() == sb.length())) {
flag = true;
}
}
if (!flag) {
list.add(sb.toString());
}
}
}
} while (list.size() != 10);
}
}2回答
-
- preatiry
- 2019-02-19 15:12:41
public void testSort4() {
List<String> stringList = new ArrayList<String>();
Random random = new Random();
char[] charList = {'a','b','c','d','e','f','d','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
String string = "";
for(int i = 0 ; i <10 ; ++i) {
int bit = random.nextInt(10) + 1;
do {
string = "";
for(int j = 0 ; j <bit ; ++j) {
string += charList[random.nextInt(26)];
}
}while(stringList.contains(string));
stringList.add(string);
}
System.out.println("--------------排序前---------------");
for (String str : stringList) {
System.out.println("字母:" + str);
}
Collections.sort(stringList);
System.out.println("--------------排序后---------------");
for (String str : stringList) {
System.out.println("字母:" + str);
}
}
-
- 慕粉3796571
- 2019-01-11 18:48:59
package com.imooc.collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
public class CollectionsTest {
/**
* 泛型为Integer的List排序
* @param args
*/
public void testSort1(){
List<Integer> list = new ArrayList<Integer>();
Random random = new Random();
int k;
for(int i=0;i<10;i++){
do{
k = random.nextInt(100);
}while(list.contains( k));
list.add(k);
System.out.println("随机数："+k);
}
//排序前遍历随机数
System.out.println("--------排序前遍历随机数------");
for (Integer integer : list) {
System.out.println("随机数："+integer);
}
//集合排序
Collections.sort(list);
//排序后遍历随机数
System.out.println("--------排序后遍历随机数------");
Iterator<Integer> iterator = list.iterator();
while(iterator.hasNext()){
System.out.println("随机数："+iterator.next());
}
}
/**
* 泛型为字符串的排序
* @param args
*/
public void testSort2(){
ArrayList<String> listStr = new ArrayList<String>();
listStr.add("jenny");
listStr.add("Mark");
listStr.add("tom");
System.out.println("--------排序前遍历字符串------");
for (String string : listStr) {
System.out.println("字符串："+string);
}
Collections.sort(listStr);
System.out.println("--------排序后遍历字符串------");
for (String string : listStr) {
System.out.println("字符串："+string);
}
}
/**
* 是个字符串，长度是1-10
* @param args
*/
public void testSort3(){
List<String> list = new ArrayList<String>();
Random random = new Random();
String use = "0123456789asdfghjklzxcvbnmqwertyuiopASDFGHJKLQWERTYUIOPXZCVBNM";
char[] charArray = use.toCharArray();
int b = charArray.length;
int k;
int index;
String bb="";
for(int i=0;i<10;i++){
do{
k = random.nextInt(10);
for(int j=0;j<=k;j++){
index = random.nextInt(charArray.length);
char c = charArray[index];
bb+=c;
}
}while(list.contains(bb));
list.add(bb);
System.out.println("随机字符串："+bb);
bb="";
}
System.out.println("----------排序前遍历字符串---------");
for (String str : list) {
System.out.println("随机字符串："+str);
}
System.out.println("----------排序后遍历字符串---------");
Collections.sort(list);
for (String str : list) {
System.out.println("随机字符串："+str);
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
CollectionsTest collectionsTest = new CollectionsTest();
//collectionsTest.testSort1();
//collectionsTest.testSort2();
collectionsTest.testSort3();
}
}
Java入门第三季
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