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JAVA Quick Reference
Example
import java.awt.Graphics;
public class HelloWorldApplet extends java.applet.Applet {
public void paint(Graphics graphicsIn)
{
graphicsIn.drawString("HelloWorldApplet.java",25,25);
}
}
For
For (int=1, i<=10; i++)
Console.WriteLine(“The number is {0}”,i );
While Loop
While (x<100)
X++;
If…Then
If (nCount < nMax)
{
nTotal += nCount;
nCount++;
}
Else
{
nTotal += nCount;
nCount-;
}
Array
Int[] nums = new int[2];
nums[0] = 100;
nums[1] = 200;
char[ ] vowels = new char[ ] {'a','e','i','o','u'};
Console.WriteLine(vowels [1]);
int[,] array = {{1,2},{3,4}};
Struct
struct Point {
public int x, y;
}
Point p1 = new Point( );
Point p2;
p2.x = p2.y = 0;
Point[] points = new Point[3];
Function Method
public void Remove(int index)
{
if (index > Count - 1 || index < 0)
{
System.Windows.Forms.MessageBox.Show("Index not valid!");
}
else
{
List.RemoveAt(index);
}
}
Class
Public class Widget
{
public string Name;
public Widget()
{
}
}
Database
Import java.sql.*;
Connection conn=Drivermanager.getconnection(Local,User,pwd)
System.out.println(“creating Statement”);
Statement stmt =conn.createStatement();
ResultSet rs = stmt.executeQuery(“SECLECTED* from userdb where name=”ian””);
String name = rs.getString(1); // Filed 1 is login name
//Password is filed 2 - do not display
String fullName = rs.getString(3);
System.out.println(“User”+name+”is named”+fullName);
Socket
Public class Listen{
Public static final short PORT = 9999
Public static void main (String[] argv) throws IOException {
ServerSorket sock; Socket clientSock;
Try { Sock = new ServerSocket(PORT) ;
While ((clientSock=sock.accept()) != null) {
process(clientSock) } }
catch (IOException e) {System.err.println(e)}}
System.out.println(“Accept from client”+s.getInetAddress());
//the conversation would be here
s.close(); }}
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