我正在尝试根据空格和一些特殊字符（如@，。，_，＆＃39;等等）拆分此字符串
public static void main(String[] args) {
String str = "He is a very very good boy, isn't he?";
// analyzing the string
String[] Val = str.split("[' '',@!_.]");// Split call
// prints the number of tokens
System.out.println("Count of tokens = " + Val.length);
for(String token :Val) {
System.out.println(token);
}
}
我正在退出
Count of tokens = 11
He
is
a
very
very
good
boy
isn
t
he?
我的问题是为什么它将空格作为角色
答案 0 :(得分：2)
我的问题是为什么它将空格作为角色
如果我把这个问题字面上，那么答案就是你在角色类中包含了一个空格，这就是为什么它在一个角色上分裂的原因空间。
但我认为你的意思是，为什么在＆＃34;男孩＆＃34;之后会有一个空白的条目。之前＆＃34; isn＆＃34;。原因是你已经告诉split分裂这些角色，所以它会这样做;因为其中两个看起来彼此相邻（逗号，然后是＃34;男孩＆＃34;之后的空格），你在得到的数组""中得到一个条目。
如果您希望它在这些字符的或更多上拆分，请在字符类之后添加+：
String[] Val = str.split("[' '',@!_.]+");// Split call
// here -----------------------------^
附注：您已在字符类中列出了' 三个单独的时间。只需一次就足够了：
String[] Val = str.split("[' ,@!_.]+");// Split call
// Just one ---------------^
答案 1 :(得分：1)
我尝试了这个例子，在使用正则表达式的时候，我找到了带有空格的相同输出。在这里，我将结果单词存储在列表中，试图消除 null 或空白
if(p != null && p.length() > 0) {
list.add(p);
}
将列表恢复为原始数组。
words = list.toArray(new String[list.size()]);
最终解决了问题陈述。这是完整的代码。尝试执行它并使用扫描仪给出与输入相同的行。
import java.io.*;
import java.util。*; public class StringTokens {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
List<String> list = new ArrayList<String>();
String s = scan.nextLine();
String delim ="[\\s+|.,?!']";
String[] words=s.split(delim);
scan.close();
for(String p : words) {
if(p != null && p.length() > 0) {
list.add(p);
}
}
words = list.toArray(new String[list.size()]);
int x =words.length;
System.out.println(x);
for(int i=0;i<words.length;i++)
{
System.out.println(words[i]);
}
}
}
答案 2 :(得分：0)
如果要分割非单词字符，则可以直接使用正则表达式
String[] Val = str.split("[' ,@!_.]+");
或者如果您想更明确地使用，那么您可以使用
/***************************************************
This is an example for the Adafruit CC3000 Wifi Breakout & Shield
Designed specifically to work with the Adafruit WiFi products:
----> https://www.adafruit.com/products/1469
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Kevin Townsend & Limor Fried for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
/*
This example does a full test of core connectivity:
* Initialization
* SSID Scan
* AP connection
* DHCP printout
* DNS lookup
* Ping
* Disconnect
It's a good idea to run this sketch when first setting up the
module.
*/
#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#include <string.h>
#include "utility/debug.h"
// These are the interrupt and control pins
#define ADAFRUIT_CC3000_IRQ 3 // MUST be an interrupt pin!
// These can be any two pins
#define ADAFRUIT_CC3000_VBAT 5
#define ADAFRUIT_CC3000_CS 10
// Use hardware SPI for the remaining pins
// On an UNO, SCK = 13, MISO = 12, and MOSI = 11
Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT,
SPI_CLOCK_DIVIDER); // you can change this clock speed but DI
#define WLAN_SSID "myNetwork" // cannot be longer than 32 characters!
#define WLAN_PASS "myPassword"
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY WLAN_SEC_WPA2
/**************************************************************************/
/*!
@brief Sets up the HW and the CC3000 module (called automatically
on startup)
*/
/**************************************************************************/
void setup(void)
{
Serial.begin(115200);
Serial.println(F("Hello, CC3000!\n"));
displayDriverMode();
Serial.print("Free RAM: "); Serial.println(getFreeRam(), DEC);
/* Initialise the module */
Serial.println(F("\nInitialising the CC3000 ..."));
if (!cc3000.begin())
{
Serial.println(F("Unable to initialise the CC3000! Check your wiring?"));
while(1);
}
/* Optional: Update the Mac Address to a known value */
/*
uint8_t macAddress[6] = { 0x08, 0x00, 0x28, 0x01, 0x79, 0xB7 };
if (!cc3000.setMacAddress(macAddress))
{
Serial.println(F("Failed trying to update the MAC address"));
while(1);
}
*/
uint16_t firmware = checkFirmwareVersion();
if (firmware < 0x113) {
Serial.println(F("Wrong firmware version!"));
for(;;);
}
displayMACAddress();
/* Optional: Get the SSID list (not available in 'tiny' mode) */
#ifndef CC3000_TINY_DRIVER
listSSIDResults();
#endif
/* Delete any old connection data on the module */
Serial.println(F("\nDeleting old connection profiles"));
if (!cc3000.deleteProfiles()) {
Serial.println(F("Failed!"));
while(1);
}
/* Optional: Set a static IP address instead of using DHCP.
Note that the setStaticIPAddress function will save its state
in the CC3000's internal non-volatile memory and the details
will be used the next time the CC3000 connects to a network.
This means you only need to call the function once and the
CC3000 will remember the connection details. To switch back
to using DHCP, call the setDHCP() function (again only needs
to be called once).
*/
/*
uint32_t ipAddress = cc3000.IP2U32(192, 168, 1, 19);
uint32_t netMask = cc3000.IP2U32(255, 255, 255, 0);
uint32_t defaultGateway = cc3000.IP2U32(192, 168, 1, 1);
uint32_t dns = cc3000.IP2U32(8, 8, 4, 4);
if (!cc3000.setStaticIPAddress(ipAddress, netMask, defaultGateway, dns)) {
Serial.println(F("Failed to set static IP!"));
while(1);
}
*/
/* Optional: Revert back from static IP addres to use DHCP.
See note for setStaticIPAddress above, this only needs to be
called once and will be remembered afterwards by the CC3000.
*/
/*
if (!cc3000.setDHCP()) {
Serial.println(F("Failed to set DHCP!"));
while(1);
}
*/
/* Attempt to connect to an access point */
char *ssid = WLAN_SSID; /* Max 32 chars */
Serial.print(F("\nAttempting to connect to ")); Serial.println(ssid);
/* NOTE: Secure connections are not available in 'Tiny' mode!
By default connectToAP will retry indefinitely, however you can pass an
optional maximum number of retries (greater than zero) as the fourth parameter.
ALSO NOTE: By default connectToAP will retry forever until it can connect to
the access point. This means if the access point doesn't exist the call
will _never_ return! You can however put in an optional maximum retry count
by passing a 4th parameter to the connectToAP function below. This should
be a number of retries to make before giving up, for example 5 would retry
5 times and then fail if a connection couldn't be made.
*/
if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
Serial.println(F("Failed!"));
while(1);
}
Serial.println(F("Connected!"));
/* Wait for DHCP to complete */
Serial.println(F("Request DHCP"));
while (!cc3000.checkDHCP())
{
delay(100); // ToDo: Insert a DHCP timeout!
}
/* Display the IP address DNS, Gateway, etc. */
while (! displayConnectionDetails()) {
delay(1000);
}
#ifndef CC3000_TINY_DRIVER
/* Try looking up www.adafruit.com */
uint32_t ip = 0;
Serial.print(F("www.adafruit.com -> "));
while (ip == 0) {
if (! cc3000.getHostByName("www.adafruit.com", &ip)) {
Serial.println(F("Couldn't resolve!"));
}
delay(500);
}
cc3000.printIPdotsRev(ip);
/* Do a quick ping test on adafruit.com */
Serial.print(F("\n\rPinging ")); cc3000.printIPdotsRev(ip); Serial.print("...");
uint8_t replies = cc3000.ping(ip, 5);
Serial.print(replies); Serial.println(F(" replies"));
if (replies)
Serial.println(F("Ping successful!"));
#endif
/* You need to make sure to clean up after yourself or the CC3000 can freak out */
/* the next time you try to connect ... */
Serial.println(F("\n\nClosing the connection"));
cc3000.disconnect();
}
void loop(void)
{
delay(1000);
}
/**************************************************************************/
/*!
@brief Displays the driver mode (tiny of normal), and the buffer
size if tiny mode is not being used
@note The buffer size and driver mode are defined in cc3000_common.h
*/
/**************************************************************************/
void displayDriverMode(void)
{
#ifdef CC3000_TINY_DRIVER
Serial.println(F("CC3000 is configure in 'Tiny' mode"));
#else
Serial.print(F("RX Buffer : "));
Serial.print(CC3000_RX_BUFFER_SIZE);
Serial.println(F(" bytes"));
Serial.print(F("TX Buffer : "));
Serial.print(CC3000_TX_BUFFER_SIZE);
Serial.println(F(" bytes"));
#endif
}
/**************************************************************************/
/*!
@brief Tries to read the CC3000's internal firmware patch ID
*/
/**************************************************************************/
uint16_t checkFirmwareVersion(void)
{
uint8_t major, minor;
uint16_t version;
#ifndef CC3000_TINY_DRIVER
if(!cc3000.getFirmwareVersion(&major, &minor))
{
Serial.println(F("Unable to retrieve the firmware version!\r\n"));
version = 0;
}
else
{
Serial.print(F("Firmware V. : "));
Serial.print(major); Serial.print(F(".")); Serial.println(minor);
version = major; version <<= 8; version |= minor;
}
#endif
return version;
}
/**************************************************************************/
/*!
@brief Tries to read the 6-byte MAC address of the CC3000 module
*/
/**************************************************************************/
void displayMACAddress(void)
{
uint8_t macAddress[6];
if(!cc3000.getMacAddress(macAddress))
{
Serial.println(F("Unable to retrieve MAC Address!\r\n"));
}
else
{
Serial.print(F("MAC Address : "));
cc3000.printHex((byte*)&macAddress, 6);
}
}
/**************************************************************************/
/*!
@brief Tries to read the IP address and other connection details
*/
/**************************************************************************/
bool displayConnectionDetails(void)
{
uint32_t ipAddress, netmask, gateway, dhcpserv, dnsserv;
if(!cc3000.getIPAddress(&ipAddress, &netmask, &gateway, &dhcpserv, &dnsserv))
{
Serial.println(F("Unable to retrieve the IP Address!\r\n"));
return false;
}
else
{
Serial.print(F("\nIP Addr: ")); cc3000.printIPdotsRev(ipAddress);
Serial.print(F("\nNetmask: ")); cc3000.printIPdotsRev(netmask);
Serial.print(F("\nGateway: ")); cc3000.printIPdotsRev(gateway);
Serial.print(F("\nDHCPsrv: ")); cc3000.printIPdotsRev(dhcpserv);
Serial.print(F("\nDNSserv: ")); cc3000.printIPdotsRev(dnsserv);
Serial.println();
return true;
}
}
/**************************************************************************/
/*!
@brief Begins an SSID scan and prints out all the visible networks
*/
/**************************************************************************/
void listSSIDResults(void)
{
uint32_t index;
uint8_t valid, rssi, sec;
char ssidname[33];
if (!cc3000.startSSIDscan(&index)) {
Serial.println(F("SSID scan failed!"));
return;
}
Serial.print(F("Networks found: ")); Serial.println(index);
Serial.println(F("================================================"));
while (index) {
index--;
valid = cc3000.getNextSSID(&rssi, &sec, ssidname);
Serial.print(F("SSID Name : ")); Serial.print(ssidname);
Serial.println();
Serial.print(F("RSSI : "));
Serial.println(rssi);
Serial.print(F("Security Mode: "));
Serial.println(sec);
Serial.println();
}
Serial.println(F("================================================"));
cc3000.stopSSIDscan();
}
答案 3 :(得分：0)
如果您想简化程序，可以使用
String st = "He is a very very good boy, isn't he?";
String[] tokens = st.split["\\W+"];
如果您打印令牌，那么您将得到正确的答案。 ：）
答案 4 :(得分：0)
对我来说，我尝试了以下示例：
public class Solution {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String s = scan.nextLine();
String [] arrOfStr= s.trim().split("\\s+|,|!|\\.|\\?|_|'|@");
scan.close();
int cmpt =0;
for (String a : arrOfStr)
if(a.isEmpty())
cmpt++;
System.out.println(arrOfStr.length-cmpt);
for (String a : arrOfStr)
if(!a.isEmpty())
System.out.println(a);
}
}