Friday Java Quiz: Know Your java.lang.Object Class
Warm Up Q: Without the help of your IDE or looking at the Javadoc, list all methods of the java.lang.Object class.
Q: Will the following program compile? Run? Print anything? If so, what?
public class Foo implements Cloneable {
private int i;
public Foo(int i) {
this.i = i;
}
public int getI() {
return i;
}
public static void main(String[] args) throws Throwable {
Foo foo1 = new Foo(1024);
Foo foo2 = (Foo) foo1.clone();
System.out.println(foo2.getI());
}
}
Follow Up Q 1: How would things change if the following method is added:
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
Follow Up Q 2: How about this?
public Object clone() throws CloneNotSupportedException {
Foo clone = (Foo) super.clone();
clone.i = this.i;
}
Again, no actually running the compiler, etc., etc., ...