小编lok*_*ath的帖子

我想使用方法来计算句子中的单词数量.我写了这段代码,我不太清楚为什么它不起作用.无论我写什么,我只收到一个字数.如果你能告诉我如何解决我写的东西,而不是给我一个完全不同的想法,那将是伟大的:

import java.util.Scanner;

public class P5_7 
{
    public static int countWords(String str)
    {
        int count = 1;
        for (int i=0;i<=str.length()-1;i++)
        {
            if (str.charAt(i) == ' ' && str.charAt(i+1)!=' ')
            {
                count++;
            }
        }
        return count;
    }
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a sentence: ");
        String sentence = in.next();
        System.out.print("Your sentence has " + countWords(sentence) + " words.");
    }
}

为什么这个程序的输出false？我期待truen对象初始化与我检查的相同的字符串.

public class Test {
    public static void main(String[] args) {
        Name n = new Name("jyoti", "meher");
        Set<Name> s = new HashSet();
        s.add(n);
        System.out.println(s.contains(new Name("jyoti", "meher")));
    }
}

class Name {
    String name, title;

    public Name(String name, String title) {
        this.name = name;
        this.title = title;
    }

    public boolean equals(Object o) {
        if (!(o instanceof Name)) {

            return false;
        }
        Name n = (Name) o;
        return n.name.equals(name) && n.title.equals(title);
    }
}

下面是我的Web应用程序的web.xml文件.我需要一个支持我的Web应用程序如何启动将逐步流程.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="
        http://java.sun.com/xml/ns/j2ee
        http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">

<display-name>Tudu Lists</display-name>

<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>WEB-INF/log4j.xml</param-value>
</context-param>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:META-INF/spring/application-context.xml</param-value>
</context-param>

<!-- Define the basename for a resource bundle for I18N -->
<context-param>
    <param-name>
        javax.servlet.jsp.jstl.fmt.localizationContext
    </param-name>
    <param-value>messages</param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>

<listener>
    <listener-class>net.sf.navigator.menu.MenuContextListener</listener-class>
</listener>

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/tudu/*</url-pattern>
</servlet-mapping>

<servlet>
    <servlet-name>dwr</servlet-name>
    <servlet-class>org.directwebremoting.spring.DwrSpringServlet</servlet-class>
    <init-param>
        <param-name>debug</param-name>
        <param-value>true</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dwr</servlet-name>
    <url-pattern>/ajax/*</url-pattern>
</servlet-mapping>

<servlet>
    <servlet-name>rss</servlet-name>
    <servlet-class>tudu.web.servlet.RssFeedServlet</servlet-class>
    <load-on-startup>3</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>rss</servlet-name>
    <url-pattern>/servlet/rss</url-pattern> …

ClassNotFoundException和NoClassDefFoundError有什么区别？

任何人都可以通过一些例子来解释..