Java How to load string value
Hello I have an application that loads into values. Values: x, y, and string value. I want to know how to load in a string because I only know how to do it with an integer. Take a look at this code:
public static void loadStars() {
try {
BufferedReader bf = new BufferedReader(new FileReader ("files/cards.txt"));
for (int i = 0; i < 10; i++) {
String line;
while ((line = bf.readLine()) != null) {
String[] args = line.split(" ");
int x = Integer.parseInt(args[0]);
int y = Integer.parseInt(args[1]);
String name = Integer.parseInt(args[2]);
play.s.add(new Star(x,y,name));
}
}
bf.close();
} catch (Exception e) {
e.printStackTrace();
}
}
I have
play.s.add(new star(x,y,name));
I know how to load into x
and y
, but I don't know how to load it into name
. Please help me.
Edit ----
The download file is formatted as follows:
x y name
Example:
10 10 jack
100 500 conor
each star is represented by 1 line.
public class Star extends BasicStar {
private Image img;
public Star(int x, int y,String starname) {
this.x = x;
this.y = y;
this.starname = starname;
r = new Rectangle(x, y, 3, 3);
}
public void tick() {
if (r.contains(Comp.mx, Comp.my) && Comp.ml) {
remove = true;
}
}
public void render(Graphics g) {
if (!displaySolar) {
ImageIcon i2 = new ImageIcon("res/planets/star.png");
img = i2.getImage();
g.drawImage(img, x, y, null);
}
}
}
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Try it.
public static void loadStars() {
try {
BufferedReader bf = new BufferedReader(new FileReader ("files/cards.txt"));
for (int i = 0; i < 10; i++) {
String line;
while ((line = bf.readLine()) != null) {
String[] args = line.split(" ");
int x = Integer.parseInt(args[0]);
int y = Integer.parseInt(args[1]);
String name = args[2]; // args array contain string, no need of conversion.
play.s.add(new Star(x,y,name));
}
}
bf.close();
} catch (Exception e) {
e.printStackTrace();
}
}
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you enhance your code with StringTokenizer. Try it.
public static void loadStars()
throws IOException {
String line;
BufferedReader bf = new BufferedReader(new FileReader ("files/cards.txt"));
try
{
while((line = bf.readLine()) != null)
{
if (line == null || line.trim().isEmpty())
throw new IllegalArgumentException(
"Line null!");
StringTokenizer tokenizer = new StringTokenizer(line, " ");
if (tokenizer.countTokens() < 3)
throw new IllegalArgumentException(
"Token number not valid (<= 3)");
int x, y;
String xx = tokenizer.nextToken(" ").trim();
String yy = tokenizer.nextToken(" ").trim();
String name = tokenizer.nextToken(" ").trim();
try
{
x = Integer.parseInt(xx);
}catch(ParseException e){throw new IllegalArgumentException(
"Number format not valid!");}
try
{
y = Integer.parseInt(yy);
}catch(ParseException e){throw new IllegalArgumentException(
"Number format not valid!");}
play.s.add(new Star(x,y,name));
}
} catch (NoSuchElementException | NumberFormatException | ParseException e) {
throw new IllegalArgumentException(e);
}
}
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Array args [] is already String, so you just need to change
String name = Integer.parseInt(args[2]);
// If you are using this values anywhere else you'd do this so de GC can collects the arg[] array
String name = new String(args[2]);
Remember that if there are spaces in the string arguments, each word will be a new argument. If you have a call:
java -jar MyProgram 1 2 This is a sentence.
Your arg [] will be:
{"1", "2", "This", "is", "a", "sentence."}
If you need a sentence to be one String, you must use apostrophes:
java -jar MyProgram 1 2 "This is a sentence."
Your arg [] will be:
{"1", "2", "This is a sentence."}
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