Developers Blog

Jul 27, 2009

Velocity example with FOR LOOP and Date format

/*Velocity example with Lists, date formate with htmls*/
import java.io.StringWriter;
import java.io.Writer;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.DateTool;

public class VelocityExp {

public static void main(String[] args) throws Exception {
Velocity.init();
Template t = Velocity.getTemplate("./src/test/VelocityExp.html");

VelocityContext ctx = new VelocityContext();
Set names =new HashSet();
Demov d1 = new Demov();
d1.setName("one");
d1.setAge("24");
d1.setKe(new demo2("one"));
Demov d2 = new Demov();
d2.setName("two");
d2.setAge("23");
d2.setKe(new demo2("two"));
Demov d3 = new Demov();
d3.setName("true");
d3.setAge("22");
d3.setKe(new demo2("three"));
Demov d4 = new Demov();
d4.setName("ofour");
d4.setAge("21");
d4.setKe(new demo2("four"));

names.add(d1);
names.add(d2);
names.add(d3);
names.add(d4);
ctx.put("products",names);
ctx.put("date", new DateTool());
ctx.put("dbdate",new Date());
ctx.put("rowCount",new Integer(1));
Writer writer = new StringWriter();
t.merge(ctx, writer);
System.out.println(writer);
}
}

Html file content:
<html>
<head>
<title>velocity test</title>
</head>
<body>
<table>
#foreach($product in $products)
#if ($rowCount % 2 == 0)
#set ($bgcolor = "#0000FF")
Applying BLUE color here
#else
Applying RED color here
#set ($bgcolor = "#FF0000")
#end
<tr>
<td bgcolor="$bgcolor">$product.name</td>
<td bgcolor="$bgcolor">$product.age</td>
<td bgcolor="$bgcolor">$product.ke.k</td>
</tr>
#set ($rowCount = $rowCount + 1)
#end
</table>
Displaying how to use date format here:
$dbdate
$date.get('medium')
$date.format('medium',$dbdate)
</body>
</html>

Jul 25, 2009

Java class with regExp

package com;

public class Name {
public static void main(String[] args) {
System.out.println(Name.class.getName().replaceAll(".", "/") + ".class");
}
}
Output:
////////.class

actually everyone thinks the output will be com/Name.class
In the case of replace '.' will treat as regExp, in regExp '.' means any type of character, here replacing with '/' , and it becomes output like "////////.class "

so, for expected answer, change the code as follows,

Name.class.getName().replaceAll("\\.", "/") + ".class");

then the output will, what you exprected,
Output:
com/Name.class

Jul 21, 2009

Small Answer for Small java pzzule!

/* What declaration turns this loop into infinitive loop.*/

public class GhostOfLooper {

public static void main(String[] args) {

// Place your declaration for i here

while (i != 0)

i >>>= 1;

}

Solution:

// Place your declaration for i here

byte i = -1;

Solution for java puzzles(3)

/*What declaration turns this loop into infinitive loop.*/

public class Looper {
public static void main(String[] args) {
// Place your declaration for i here

while (i == i + 1) {
}
}
}

Solution:
// Place your declaration for i here
double i = 1.0/0.0

Solution for java puzzles(2)!

/*Provide declarations for the variables x and i such that*/

public class Tweedledum {
public static void main(String[] args) {
// Put your declarations for x and i here
x += i; // Must be LEGAL
x = x + i; // Must be ILLEGAL
}
}
solution:
// Put your declarations for x and i here
int x=0;
byte i;