How do I make an instance of another class??

How do I make an instance of a class, (eg. the name of the class is oldJava.class and have a constructor that takes 3 parameters)in a new class. and send paramaters to the oldJava.class constructor. I also want to recive the result from oldJava.class in my new class.
??I would be really glad if I could get some code example.....
//HA

oldJava o = new oldJava(..., ..., ...); // your arguments here
o.method1(); // you can call methods on this object now
// If the method returns anything back, you can keep a reference to it
int result = o.sum(2, 5);

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