Java--泛型

class TNode<T> //<>写在类名后
{
private T value;
private ArrayList<TNode<T>> children = new ArrayList<>();

TNode(T v) { this.value = v; }
public T getValue() { return this.value; }
public void add(T v) {
TNode<T> child = new TNode<>(v);
this.children.add(child);
}
public TNode<T> getChild(int i) {
if ((i < 0) || (i > this.children.size())) return null;
return (TNode<T>)this.children.get(i);
}

public void traverse() {
System.out.println(this.value);
for (TNode child : this.children)
child.traverse();
}
}