Java 在排序方法中忽略符号
所以我尝试对一个string arrayglobal变量进行排序,虽然我可以忽略大小写敏感度,但我需要帮助忽略第一个字母之前的符号,例如。 ~abc等Java 在排序方法中忽略符号,java,arrays,sorting,symbols,Java,Arrays,Sorting,Symbols,所以我尝试对一个string arrayglobal变量进行排序,虽然我可以忽略大小写敏感度,但我需要帮助忽略第一个字母之前的符号,例如。 ~abc等 public void sort() { int n = myArray.length; for (int i=0; i<n-1; i++){ for(int j=0; j<n-i-1; j++){ if((myArray[j+1]).compareToIgnoreCase
public void sort()
{
int n = myArray.length;
for (int i=0; i<n-1; i++){
for(int j=0; j<n-i-1; j++){
if((myArray[j+1]).compareToIgnoreCase(myArray[j])<0){
String temp = myArray[j];
myArray[j] = myArray[j+1];
myArray[j+1] = temp;
//toLower
}
}
}
}
您可以删除所有特殊字符并进行排序
// Drop all special characters
List<String> collect = Arrays.asList(myArray).stream().map(e -> e.replaceAll("[YourSpeciallCharacterss]", "")).collect(Collectors.toList());
//sort the list
collect.sort(String::compareTo);
您可以通过替换所有匹配的字符来删除控制字符: \p{Cntrl}-控制字符:[\x00-\x1F\x7F] 下面是一个如何做到这一点的示例:
public static void main(String[] args) throws IOException {
List<String> list = Arrays.asList("\u0001" + "B", "\u0002" + "AAA", "\u0003" + "AB");
System.out.println("With control characters: " + list.stream().sorted().collect(Collectors.toList()));
Pattern removeControl = Pattern.compile("\\p{Cntrl}");
List<String> sorted = list.stream().map(s -> removeControl.matcher(s)
.replaceAll("")).sorted().collect(Collectors.toList());
System.out.println("No control characters: " + sorted);
}
好的,我想出了这个代码。它可以编译,但在运行时陷入了无休止的循环;然而,当我不忽略符号时,排序和写入确实需要18秒,可能是因为有30000个单词。。否则,它就会陷入一个无休止的循环 IO类{
String[] myArray = new String[30000];
public void read()
{
try {
Scanner myLocal = new Scanner( new File("dictionary.txt"));
while (myLocal.hasNextLine()){
for (int i=0; i<myArray.length; i++){
String a = myLocal.nextLine();
myArray[i] = a;
}
}
}
catch(IOException e){
System.out.println(e);
}
}
public void sort()
{
int n = myArray.length;
String myIgnore = "[^a-zA-Z]+"; // alpha only
String word1 = "";
String word2 = "";
for (int i=0; i<n; i++){
for(int j=1; j<n-i; j++){
word1 = myArray[j-1].replaceAll(myIgnore,"");
word2 = myArray[j].replaceAll(myIgnore,"");
if (word1.compareTo(word2)>0){
String temp = word1;
word1=word2;
word2=temp;
}
}
}
}
public void write()
{
try{
PrintStream writer = new PrintStream(new File("myIgnoreNew.txt"));
for (int i=0; i<myArray.length; i++){
writer.println(myArray[i] + "\n");
}
writer.close();
}
catch(IOException e){
System.out.println(e);
}
}
}您可以编写一个简单的方法,通过仅提取字母来转换字符串,也可以使用regexi。如果您从英语字母表中排序字母,则可以使用非常简单的正则表达式。看看
String[] myArray = new String[30000];
public void read()
{
try {
Scanner myLocal = new Scanner( new File("dictionary.txt"));
while (myLocal.hasNextLine()){
for (int i=0; i<myArray.length; i++){
String a = myLocal.nextLine();
myArray[i] = a;
}
}
}
catch(IOException e){
System.out.println(e);
}
}
public void sort()
{
int n = myArray.length;
String myIgnore = "[^a-zA-Z]+"; // alpha only
String word1 = "";
String word2 = "";
for (int i=0; i<n; i++){
for(int j=1; j<n-i; j++){
word1 = myArray[j-1].replaceAll(myIgnore,"");
word2 = myArray[j].replaceAll(myIgnore,"");
if (word1.compareTo(word2)>0){
String temp = word1;
word1=word2;
word2=temp;
}
}
}
}
public void write()
{
try{
PrintStream writer = new PrintStream(new File("myIgnoreNew.txt"));
for (int i=0; i<myArray.length; i++){
writer.println(myArray[i] + "\n");
}
writer.close();
}
catch(IOException e){
System.out.println(e);
}
}