insatiate a class based on a string

[frank]

Was wondering if there was a better way to insatiate a class based on
some string variable read from a properties file then an if-then-else?

String s = "class1";

if (s.equals("class1"))
{
myClass c1 = new class1();
}
else if (s.equals("class2"))
{
myClass c2 = new class2();
}
.....

Thanks,

Frank

 

[Ingo R. Homann]

Hi frank,

Was wondering if there was a better way to insatiate a class based on
some string variable read from a properties file then an if-then-else?

String s = "class1";

if (s.equals("class1"))
{
myClass c1 = new class1();
}
else if (s.equals("class2"))
{
myClass c2 = new class2();
}
....

Thanks,

Frank

Class.forName(s).newInstance();

Hth,
Ingo

 

[Daniel Dyer]

Was wondering if there was a better way to insatiate a class based on
some string variable read from a properties file then an if-then-else?

String s = "class1";

if (s.equals("class1"))
{
myClass c1 = new class1();
}
else if (s.equals("class2"))
{
myClass c2 = new class2();
}
....

Use reflection. Take a look at the methods in the Class class
(http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html),
particularly the forName and newInstance methods. You may also need the
getConstructor method and the java.lang.reflect.Constructor class if your
constructors have parameters.

Dan.

 

[frank]

Thanks!!!

Use reflection. Take a look at the methods in the Class class
(http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html),
particularly the forName and newInstance methods. You may also need
the getConstructor method and the java.lang.reflect.Constructor class
if your constructors have parameters.

Dan.

 

[Roedy Green]

String s = "class1";

if (s.equals("class1"))
{
myClass c1 = new class1();
}
else if (s.equals("class2"))
{
myClass c2 = new class2();
}
....

see http://mindprod.com/jgloss/classforname.html


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