sweetgirl669的博客

public class trycath {public static String output="";public static void foo(int i){try{if(i==1){throw new Exception();}output+="1";}catch (Exception e) {output+="2";return;}fin

1.static修饰全局变量package First_test;//注意用static修饰的变量是全局变量，不能修饰局部变量（即不能在方法体中修饰变量） public class testStatic {        static int i = 0;      // static修饰的i是全局变量        public int aMethod() {        ...

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class...

问题一：java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezon...

DBCP线程池的练习因为中间有其他包，所以分开截图的。package Test_DBCP;import java.io.IOException;import java.io.InputStream;import java.sql.Connection;import java.sql.SQLException;import java.util.Properties...

  本节内容是转载https://blog.youkuaiyun.com/yuxin6866/article/details/52771739的，并对部分进行了修改。public class sort { public static void main(String[] args) { sort s = new sort(); int arr[] = { 6,1,2,7,9,3,4,5,10...

转自Jackvin   https://www.cnblogs.com/fjsnail/p/3491033.html 这时：commonsmultipartresolver 的源码，可以研究一下 http://www.verysource.com/code/2337329_1/commonsmultipartresolver.java.html前台： 1 2 ...

1，在pom中导入依赖<!--分页依赖--> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId&...

一、前言      为毛要用nginx服务器代理，不直接用tomcat 7.0，还做多了一次接请求？      这个是我想问的，公司的新项目是要用Nginx+tomcat7+jdk开发的，用户命名可以直接访问tomcat，为啥还要用Nginx？这货是个啥玩意？二、为什么使用Nginx？     在传统的Web项目中，并发量小，用户使用的少。所以在低并发的情况下，用户可以直接访问t...

package Test;import java.util.ArrayList;import java.util.HashSet;import java.util.Iterator;import java.util.List;import java.util.Set; public class Bean1{public static void main(Stri

package Test;import java.io.*;public class TestFileOutputStream {public static void main(String args[]) {int data[] = { 0, 1, 2, 3, 4, 5 };int a = 0; FileOutputStream out = null;try {o

package Test;//例 判断和为10的两个数 3 7 是否为素数；import java.util.Scanner;public class sushutest2{    public static void main(String[] args){        Scanner sc= new Scanner(System.in);        int n

package Test;public class shuzu {public static void main(String[] args) {    String  s=null;        s.concat("abc");    }}结果：Exception in thread "main" java.lang.NullPointe

package Test;public class NULL {public static void say(){System.out.println("1");} public static int getvalue(int i){int result=0;switch(i){case 1:result=result+i;case 2:

package Test;//用 实现Runnable接口，重写run方法 来实现class MyThread implements Runnable{private int num=100;public void run() {while(true){synchronized (this) {if(num>0){System.out.println(T

package Test;/* * 一整数数组，将奇数放在前面，偶数放在后面。两种方法（1）用快排思想。（2）用集合 * */import java.util.ArrayList;import java.util.List;public class jiouShunxu {public static void main(String[] args) {//

package Test;//判断101-200之间的素数public class isPrime {public static void main(String[] args) {boolean b = false;for (int i = 101; i for (int j = 2; j if (i % j == 0) {b = false;brea

package Test;/* * 输入一个字符串，删除个数最少的字符 * 如输入abbcc 输出bbcc */import java.util.HashSet;import java.util.*;import java.util.Set;public class abbcc {public static void main(String[] args

public class Test{public static void main(String[] args) {           String str="abcdefg";             int len=str.length();           char ch[]=str.toCharArray();           beforChar(4,ch