I'm currently studying collections and while I was changing a code from generics to without generics and I came into the looping of a none generic collection, how can I loop the collection without generics in the code below? Is there any way that I can know what is the type of an object in a collection without generics?
import java.util.Iterator;
import java.util.TreeSet;
public class Forest4 {
private String name;
private String county;
private TreeSet trees;
public Forest4(String n, String c) {
name = n;
county = c;
trees = new TreeSet();
}
public String getname() {
return name;
}
public String getcounty() {
return county;
}
public TreeSet gettrees() {
return trees;
}
public void setname(String x) {
name = x;
}
public void setcounty(String x) {
county = x;
}
public void settrees(TreeSet b) {
trees = b;
}
public void AddTree(Tree T) {
trees.add(T);
}
public void FindTree(Tree T) {
if (trees.contains(T)) {
T.print();
} else {
System.out.println(" An" + T.getname() + "tree is not found in the forest");
}
}
public void RemoveFruitfulTrees_foreach() {
for (Tree y : trees) {
if (y.getfruitful() == true) {
trees.remove(y);
}
}
}
/*
* public void RemoveFruitfulTrees_forloop(){ for(int i=0;i<trees.size();i++){
*
* Tree y=trees.get(i); if(y.getfruitful()==true){ trees.remove(y); } }
*
* }
*/
public void RemoveFruitfulTrees_iterator() {
Iterator<Tree> b;
b = trees.iterator();
while (b.hasNext() == true) {
Tree c = b.next();
if (c.getfruitful() == true) {
trees.remove(c);
}
}
}
}
The error was "Type mismatch: cannot convert from element type Object to Tree" in this snippet
public void RemoveFruitfulTrees_foreach() {
for (Tree y : trees) {
if (y.getfruitful() == true) {
trees.remove(y);
}
Thanks in advance!
