1.Policy pattern: The policy container does not know the details of the internal policy, because the container does not implement the same interface as the internal policy, that is, the container and the internal policy is simply a combination relationship, the container only extracts the behavior of the internal policy, and carries out a unified implementation.
2.Example
public interface Client {
public abstract void test() ;
}
public class Big implements Client{
@Override
public void test() {
System.out.println("3Fold ");}}Public class Min implements Client{@OverridePu...
1、 The function of requirement is not realized.
2、 Realized the function that the demand has no requirement.
3、 There are clearly specified mistakes that should not be made in the software.
（Extension: what are the two basic elements of software?
1） Function should be able to achieve
2） To have strong exception handling capability (robustness)
4、 Although demand is not mentioned explicitly, the function that should be realized has not been realized.
（Note: Requirements may have omissions, we can not test the wor...
1.Mediator pattern / / do not need to coordinate the relationship between themselves.
2.Example
public interface Mediator {
void register(String dname,Department d);
void command(String dname);
}
public class President implements Mediator {
private Map<String,Department> map = new HashMap<String , Department>();
@Override
public void command(String dname) {
map.get(dname).selfAction();
}
@Override
public void register(String dname, Department d) {
map.put(dname, d);
}
}
public interface Department {
void selfAction();
voi...
UbuntuIn the system, Python version 2.7.x is installed by default, and python command is executed directly. Pthon version 2.7.x will be opened; Python version 3 needs to be installed by itself, and after successful installation, Python 3 will open pyt.Hon 3.x version.
pythonIt is installed in the /usr/bin directory; the python library is installed in /usr/local/lib/python XX. XX is the version number.
This article introduces the installation of Python source code in Ubuntu system:
Official website download source: WGet https://www.python.org/ftp/python/3.5...
1 #include<iostream>
2 #include<cstdio>
3 using namespace std;
4 const int maxn=1e5+7;
5 const int maxm=5e5+7;
6 const int inf=0x7f7f7f7f;
7 int n,m,num;
8 int head[maxn],val[maxn],f[maxn],mi[maxn];
9 int read(){
10 int f=1;int x=0;char s=getchar();
11 while(s<'0'||s>'9') {if(s=='-') f=-1;s=getchar();}
12 while(s>='0'&&s<='9'){x=x*10+s-'0';s=getchar();}
13 x*=f;
14 return x;
15 }
16 struct Edge{
17 int next,to;
18 }edge[maxm];
19 void add(int from,int to){
20 edge[++num].next=head[from];
21 edge[num].to=to;
22 head[...
For example, to ABC
To print ABC, ACB, BAC, BCA, cab, CBA.
void AA(char* pStr,char* pBegin)
{
if(*pBegin == '\0')
cout << pStr << endl;
else
{
for(char* ptemp = pBegin;*ptemp != '\0';ptemp++)
{
if(ptemp != pBegin)
{
char a = *ptemp;
*ptemp = *pBegin;
*pBegin = a;
}
AA(pStr,pBegin+1);
if(ptemp != pBegin)
{
char a = *ptemp;
*ptemp = *pBegin;
*pBegin = a;
}
...
1 New WPF application WPFMVVMExample
The program structure is shown in the following figure.
2 ModelRealization
Under the Model folder, create a new Business Class StudentModel (Class File StudentModel. cs), and the detailed code for the class is shown below.
using System.ComponentModel;
namespace WPFMVVMExample.Model
{
public class StudentModel : INotifyPropertyChanged
{
/// <summary>
/// School number/// </summary>
private int studentId;
public int StudentId
{
get
{
return studen...
Correct method
windows->perferences
Delete all the options. These are the Tomcats you deleted after you added them. One doesn’t leave. Restarting eclipse after deleting solves the problem
Problem solving can be added.
Failure method
There is no such directory in my eclipse4.3 directory..metadata/.plugins/org.eclipse.core.runtime/.settings】
1. Close Eclipse
2. Open the location of WorkSpace.
{workspace-directory}/.metadata/.plugins/org.eclipse.core.runtime/.settings
Delete the following files
org.eclipse.jst.server.tomcat.core.prefs
org.eclipse.wst.server.core.prefs
3....
