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I have just declared a two-dimensional array in my program:
String[][] choices = new String[4][];
choices[0] = new String[10];
choices[1] = new String[20];
choices[2] = new String[20];
choices[3] = new String[20];
However, IntelliJ Idea, the IDE I am currently using, threw out a bunch of errors starting from the second line. What is wrong with my code? I have checked other questions regarding two-dimensional arrays and found the exact same syntax being used.
EDIT: Based on my code above, I want the arrays to be of different length. Is that possible to make?
Your code snippet works fine, and you can have inner String arrays of different length, e.g.:
String[][] choices = new String[2][];
choices[0] = new String[1];
choices[1] = new String[2];
choices[0][0] = "Foo";
choices[1][0] = "Bar";
choices[1][1] = "Baz";
System.out.println(choices[0][0] + " " + choices[1][0] + " " + choices[1][1]);
Ideone demonstration.
In short, your problem is elsewhere. Read the errors since that's what they're for. They're often descriptive enough.
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I've got this string:
"type":"image","originX":"center","originY":"center","left":135,"top":259,"width":270,"height":519,"fill":"rgb(0,0,0)","overlayFill":null,"stroke":null,"strokeWidth":1,"strokeDashArray":null,"strokeLineCap":"butt","strokeLineJoin":"miter","strokeMiterLimit":10,"scaleX":1,"scaleY":1,"angle":0,"flipX":false,"flipY":false,"opacity":1,"shadow":null,"visible":true,"clipTo":null,"src":"file:///C:/Users/Alvin%20Combrink/Dropbox/Entrepren%C3%B6rskap/Design/Hemsidan/Backgrunder/Labyrint.jpg","filters":[]},
each part is seperated by a comma, i want to be able to extract a few of the numbers into doubles. The ones i want are left, top, scaleX, scaleY and angle. How shall i approch this?
thanks
If you don't want to rely on using JSON parsers (you should, though, if you are using JSON a lot), you could use the split-method on the entire string and split according to , (comma), find the chunks of data that you want, split those according to : and read the data directly from the 2nd slot in the resulting array.
You may need to substring the last " to be able to parse the numbers directly, though.
But like I said, you really do want to use a JSON parser of some kind if you are using JSON more than a few times in your program.
Code example:
String abc = "ABC:123,DEF:456,GHI:789";
String[] chucks = abc.split(",");
String[] oneToThree = chunks[0].split(":");
String nums = oneToThree[1];
System.out.println(nums);
//This will print 123
I know that someone already replied, but I've been doing this, hope that help too:
public class HelloWorld{
public static void main(String []args){
String text ="\"type\":\"image\",\"originX\":\"center\",\"originY\":\"center\",\"left\":135,\"top\":259,\"width\":270,\"height\":519,\"fill\":\"rgb(0,0,0)\",\"overlayFill\":null,\"stroke\":null,\"strokeWidth\":1,\"strokeDashArray\":null,\"strokeLineCap\":\"butt\",\"strokeLineJoin\":\"miter\",\"strokeMiterLimit\":10,\"scaleX\":1,\"scaleY\":1,\"angle\":0,\"flipX\":false,\"flipY\":false,\"opacity\":1,\"shadow\":null,\"visible\":true,\"clipTo\":null,\"src\":\"file:///C:/Users/Alvin%20Combrink/Dropbox/Entrepren%C3%B6rskap/Design/Hemsidan/Backgrunder/Labyrint.jpg\"";
//Just left and scaleX for example
String left = readValue(text, "left");
String scaleX = readValue(text, "scaleX");
System.out.println("left:" + left);
System.out.println("scaleX:" + scaleX);
}
public static String readValue(String text, String key)
{
//search for the init of the value
int start = text.indexOf("\"" + key + "\"");
//search for the end of the value
int end = text.indexOf(",", start + key.length() + 3);
//return the value. these + 3 , is for quotes and ":"
return text.substring(start + key.length() + 3,end);
}
}
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please help me find the code for getting the next character in the string
for example:
input string = "abcd"
output string = "bcde"
I can able to iterate only one character at the time.
thanks in advance
Get the ASCII of the last character in the String and increase the ASCII value by 1.
try this,
String sample = "abcd";
int value = (int) sample.charAt(sample.length() - 1); // here you get the ASCII value
System.out.println("" +((value < ((int)'z')) ? sample.substring(1) + (char) (value + 1) : sample));
Simply add one to the char values:
char[] chars = "abcd".toCharArray();
for (int i = 0; i < chars.length; i++) {
chars[i] += 1;
}
String nextChars = new String(chars);
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I have a function that has an output as a 4 character String like "1000". I need to convert this into a vector of dimension (4,1) in order to be able to make computation with matrices.
Any idea or help? Thank you very much in advance.
String s = "1000";
Vector myVec = new Vector();
//Convert the string to a char array and then just add each char to the vector
char[] sChars = s.toCharArray();
for(int i = 0; i < s.length(); ++i) {
myVec.add(sChars[i]);
}
Try:
Vector<Character> v = new Vector<Character>(Arrays.asList(yourString.toCharArray()))
As stated by fge, a List would be at least as useful as a Vector:
List<Character> l = Arrays.asList(yourString.toCharArray())
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I have some string type data in my database table like as D-101 and D-102.
I want to get automatically next data in front end (a JSF web application) to send to database which is D-103.
For this I want to get only int data from string.
How can I do this?
final Pattern lastIntPattern = Pattern.compile("[^0-9]+([0-9]+)$");
String input = D101;
Matcher matcher = lastIntPattern.matcher(input);
if (matcher.find()) {
String someNumberStr = matcher.group(1);
int lastNumberInt = Integer.parseInt(someNumberStr);
System.out.println("Test int output - " + lastNumberInt);
inputList.add(lastNumberInt);
}
then compare max value
int currentBranchCode = 0;
for (Integer CCS : companyArrayList) {
if (currentBranchCode <= CCS) {
currentBranchCode = CCS;
}
}
and then
currentBranchCode =currentBranchCode +1;
String codegenerate="D"+currentBranchCode;
you must try it.
In your managed bean you can use split() function.
String s = "D-101";
String[] arr = s.split("[^\\d]+");
System.out.println(arr[1]); //prints 101
OR
In the xhtml page you can write an EL like this. Note that myBean is the name of your bean and getColumnValue() method returns a value of a column(i.e. "D-101").
#{myBean.columnValue.split('[^\\d]+')[1]}
This can be done in just a couple of lines:
int i = Intger.parseInt(input.replaceAll(".*(?<!\\d)(\\d+)", "$1");
String next = input.replaceAll("(.*)(?<!\\d)\\d+", "$1"+ ++i);