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javagenericsstringbuffer

Using StringBuffer and Generics

I was trying to use StringBuffer and Generics, but the code won't compile:

[Gen.java]

class Gen<T> 
{
T ob;
//Constructor
Gen (T o)
{
 ob = o;
}

void showtype()
{
    System.out.println("Type of T is:"+ob.getClass().getName());
}

T getOb()
{
    return ob;
}

}

[GenDemo.java]

public class GenDemo
{
public static void main(String[] args)
{

    Gen<StringBuffer> objStr;
    objStr = new Gen<StringBuffer> ("Hello"); //doesn't compile here.
    objStr.showtype();
    StringBuffer str = objStr.getOb();
}
}

I am a beginner. So, I apologize if this question is too basic for you. Can someone please help me? The code compiles well if I replace "StringBuffer" with "String"

Thanks

Solution

  • You're trying to initialise a Gen<StringBuffer> with a String. Change the initialisation to objStr = new Gen<StringBuffer>(new StringBuffer("Hello")) and everything should be fine.