Hello How do I convert in a ArrayList<> something to String I will show you my code I am really bad a at explaining stuff sorry:
ArrayList<HerniObjekt> batoh = new ArrayList<>();
public void pridej(HerniObjekt objekt)
{
batoh.add(objekt);
}
public void vypis()
{
JOptionPane.showMessageDialog(null, "Mas v Inevtari "+batoh.);
}
And I would like to convert the HerniObject to String how do I do that? thanks for your help.
You need to build a string by iterating through the array and adding each element to a StringBuilder
e.g. without specifying a separator....
StringBuilder sb = new StringBuilder();
for (HerniObjekt h : batoh) {
sb.append(h);
}
Alternatively, Guava has a Joiner class.
Joiner joiner = Joiner.on("; ").skipNulls();
. . .
return joiner.join("Harry", null, "Ron", "Hermione");
In either case you should override toString() in your HerniObjekt class
In your class HerniObjekt, you can override the method public String toString(){} so it returns what you want to output in String
override toString() method in HerniObject ,then foreach add to arraylist.
For a list you could use HTML markup too.
StringBuilder sb = new StringBuilder();
sb.append("<html><p>Mas v Inevtari</p><ul>");
for (HerniObjekt herni : batoh) {
sb.append("<li>").append(herni).append("</li>");
}
sb.append("</ul>");
JOptionPane.showMessageDialog(null, sb.toString());
The above append(herni) will use toString().
get the HerniObjekt list object and assign it to HerniObjekt object in for-each loop
i.e.
StringBuilder strBuilder = new StringBuilder();
for(HerniObjekt herni : batoh){
strBuilder.append(herni);
}
Append the HerniObjekt object value to a StringBuilder object shown above.
class HerniObjekt{
int id;
@Override // Override this method with meaningful
public String toString() {
return "Id=" + this.id ;
}
}
ArrayList<HerniObjekt> batoh = new ArrayList<>();
StringBuilder strBuilder = new StringBuilder();
for (HerniObjekt object: batoh ) {
strBuilder.append(object.toString());
}
System.out.println(strBuilder.toString());
or
System.out.println(batoh.toString());
HerniObektlook like? Which String you would like to get from each object? And finally, what have you tried?package javagame; import java.awt.Graphics; public abstract class HerniObjekt { int y; int x; int smerx; int smery; int rychlost; public abstract void krok(); public abstract void vykresli(Graphics g); }and I tried HenriObject.toString