王小涛_同學的专栏

王小涛_同學

java.lang.NoClassDefFoundError: Lorg/springframework/beans/factory/access/BeanFactoryReference; at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields...

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275) at org.apache.c...

java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: Root WebApplicationContext: startup date [Tue May 15 13:49:58 CS...

package cn.itcast;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.I...

@Test public void fun2() throws MessagingException, IOException{ /** * 1.得到session * */ Properties props = new Properties(); //设置服务器地址 props.setPr...

“` package cn.itcast;import java.util.Properties;import javax.mail.Authenticator; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; im...

Exception in thread "main" javax.mail.AuthenticationFailedException: failed to connectat javax.mail.Service.connect(Service.java:322)at javax.mail.Service.connect(Service.java:172)at javax.mail.Ser...

package cn.itcast;import java.io.IOException;import java.io.UnsupportedEncodingException;import org.junit.Test;import sun.misc.BASE64Decoder;/* * @author soto * BASE64编码 解码 * */public cla...

package com.soto.collection2;import java.util.ArrayList;import java.util.List;public class Test01 { public static void main(String[] args) throws Exception { //一个对象对应了一行记录 Employee e= new...

package com.soto.collection2;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class Employee { //Javabean（只有属性和ste ,...

java中有二种移位运算符>>   右移运算符    num >> 1       //num除以2

一、Collection类对象在调用remove, contains等方法时需要比较对象是否相等，这会涉及到对象类型的equals,方法和hashCode方法；对于乍定义的类型，需要重写equals和hashCode方法（同时）以实现自定义的对象相等规则。注意：Java中规定，两个内容相同的对象应具有相同的hashCode//二、引用网络代码及解释如下：链接：https://www.n

package com.soto.collection;/** * 自己实现一个ArrayList,帮助我们更好地理解ArrayList的底层结构; * @author 王 * */public class SxtArrayList { private Object[] elementData; private int size; public int size(){ r...

package com.soto.collection;/** * add 和 get方法 * * @author 王 * */public class SxtLinkedList /*implements List*/ { //双向链表， private Node first; //（第一个结点）链，获得第一个，就能继续往下找了 private Node last...

SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/jdbcUtilsExample]] at o...