《Cracking the Coding Interview》——第14章：Java——题目4

// 14.4 tell me about the differences between C++ template and java generics.
// Answer:
//    1. C++ template can be used on built-in type and user-defined types, java generics can only be used on classes. Integer for int, Double for double.
//    2. java generics can put some restrictions on the <T>, such as <T extends superclass>, whereas this is not practical in C++.
//    3. You may use downcast instead of generics, but generics enhance the resuability of code, so is template in C++.
import java.util.Vector;

public class TestJava<T> {
public T data;

public TestJava(T data) {
// TODO Auto-generated constructor stub
this.data = data;
}

String getType() {
return this.data.getClass().getName();
}

public static void main(String[] args) {
Vector<Integer> v = new Vector<Integer>();
v.add(2);
v.add(1);

TestJava<Vector<Integer>> testJava = new TestJava<Vector<Integer>>(v);
System.out.println(testJava.getType());
System.out.println(v);
}
}