non-static variable this cannot be referenced from a static context

[kookey]

Today i always get this error:
non-static variable xxx cannot be referenced from a static context
^
e.g.
import java.net.URL;
class Test{
public static void main(String[] args){
URL url = this.getClass().getResource("1.xml");
System.out.println(url);
}
}
error: non-static variable this cannot be referenced from a static
context ^

But,when
import java.net.URL;
class Test{
public Test(){
URL url = this.getClass().getResource("1.xml");
System.out.println(url);
}
public static void main(String[] args){
Test test = new Test();
}
}
The result is right.
I want why.

 

[Joan]

Today i always get this error:
non-static variable xxx cannot be referenced from a static
context
^
e.g.
import java.net.URL;
class Test{
public static void main(String[] args){
URL url = this.getClass().getResource("1.xml");
System.out.println(url);
}
}
error: non-static variable this cannot be referenced from a
static
context ^

But,when
import java.net.URL;
class Test{
public Test(){
URL url = this.getClass().getResource("1.xml");
System.out.println(url);
}
public static void main(String[] args){
Test test = new Test();
}
}
The result is right.
I want why.

kookey<

main() is static, Test() is not static.

 

[kookey]

why "a non-static variable cannot be referenced from a static context"
?
please say clearly , the 2nd floor - Joan.

 

[Andrew Thompson]

please say clearly ,..

Detailed answers are best found on a different group..
<http://www.physci.org/codes/javafaq.jsp#cljh>