允許用戶使用字符串?dāng)?shù)組.他們可以向數(shù)組添加字符串,從數(shù)組中刪除字符串,搜索數(shù)組中的字符串,最終他們將能夠?qū)?shù)組進(jìn)行排序.分類是搞砸我的原因.我嘗試過幾種不同的方法.第一種方法是將數(shù)組轉(zhuǎn)換為ArrayList,并使用Collections對ArrayList進(jìn)行排序,ArrayList將轉(zhuǎn)換回靜態(tài)類數(shù)組.它不起作用.我嘗試的第二種方法是迭代數(shù)組并嘗試僅排序用戶添加的字符串而不是數(shù)組中的所有內(nèi)容(因?yàn)閿?shù)組中有一些空值).也許我應(yīng)該遍歷數(shù)組,然后將非null值存儲到一個新的數(shù)組中,然后我可以對它進(jìn)行排序？但是如果我想在排序新數(shù)組后添加更多字符串呢？這就是為什么我停止了第二個解決方案.第三次嘗試是在我的數(shù)組上使用Arrays.sort()但由于某種原因它不起作用.

這是一個例外：

Exception in thread "main" java.lang.NullPointerException

at java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:290)

at java.util.ComparableTimSort.sort(ComparableTimSort.java:157)

at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)

at java.util.Arrays.sort(Arrays.java:472)

at java.util.Collections.sort(Collections.java:155)

at testingSearch.sortArray(testingSearch.java:93)

at testingSearch.main(testingSearch.java:42)

這是我的代碼：

import java.util.Scanner;

import java.util.Arrays;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class testingSearch {

static String[] strArray;

static {

strArray = new String[5];

}

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

while(true){

System.out.println("1. Add string to the string array.");

System.out.println("2. Remove string from the string array.");

System.out.println("3. Display strings in string array.");

System.out.println("4. Search the string array for a string.");

System.out.println("5. Sort the strings in the string array.");

int userChoice = 0;

userChoice = input.nextInt();

switch(userChoice) {

case 1:

addString();

break;

case 2:

removeString();

break;

case 3:

displayStrings();

break;

case 4:

searchArray();

break;

case 5:

sortArray();

break;

}

}

}

public static void addString(){

Scanner input = new Scanner(System.in);

System.out.println("What string do you want to add?");

String userInput;

userInput = input.nextLine();

ArrayList stringList = new ArrayList (Arrays.asList(strArray));

stringList.add(userInput);

strArray = stringList.toArray(strArray);

}

public static void removeString(){

Scanner input = new Scanner(System.in);

System.out.println("What string do you want to remove?");

String userInput;

userInput = input.nextLine();

ArrayList stringList = new ArrayList (Arrays.asList(strArray));

stringList.remove(userInput);

strArray = stringList.toArray(strArray);

}

public static void displayStrings(){

for (String s: strArray){

if (!(s == null)){

System.out.println(s);

}

}

}

public static void searchArray(){

Scanner input = new Scanner(System.in);

System.out.println("What string do you want to search the array for?");

String userInput;

userInput = input.nextLine();

ArrayList stringList = new ArrayList(Arrays.asList(strArray));

if (stringList.contains(userInput)){

System.out.println("The string array contains that string!");

}

else {

System.out.println("The string array does not contain that string...");

}

}

public static void sortArray(){

/*ArrayList stringList = new ArrayList (Arrays.asList(strArray));

Collections.sort(stringList);

strArray = stringList.toArray(strArray);*/

/*for (String s: strArray) {

if (!(s == null)){

Arrays.sort(strArray);

}

}*/

List stringList = new ArrayList(Arrays.asList(strArray));

Collections.sort(stringList);

strArray = stringList.toArray(strArray);

//Arrays.sort(strArray);

}

}

總結(jié)

以上是生活随笔為你收集整理的java字符串数组排序_在Java中对字符串数组进行排序的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。