// Example 123 from page 93

//

class Hold<T> {

private T contents;

@SuppressWarnings("unchecked")

public void set(Object x) {

contents = (T)x; // Unchecked cast

}

public T get() {

return contents;

}

}

class Example123 {

public static void main(String[] args) {

Hold<Integer> h = new Hold<Integer>();

h.set("foo"); // Succeeds at run-time

System.out.println("Succesfully executed h.set(\"foo\")");

h.get(); // Succeeds at run-time

System.out.println("Succesfully executed h.get()");

// String s = h.get(); // Illegal, rejected by compiler

Integer i = h.get(); // Legal, but fails at run-time

System.out.println("Succesfully executed Integer i = h.get()");

}

}