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int [ ] a;
What is happening in this line can anybody describe. It has spaces between [].
You are defining a reference to an array which is presently null, and therefore of undefined size.
This is correct syntax. The spaces in between square brackets are not relevant.
Here is some proper further usage:
int [] a = new int[10];
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I want to convert GBP 29.15* to just 29.15.
Can anyone please help?
I have already tried parsing to integer/float, substring etc. but getting an error.
Try this:
float f = Float.valueOf("GBP 29.15*".replaceAll("[^\\d.]+|\\.(?!\\d)", ""));
It removes all non-number characters and then finds the float value.
See also: How to get float value from string
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I have tried all sorts of keyword related but I keep getting it wrong.
The only word in Java that precisely meets your vague description is null. If so, it isn't a keyword, it's a literal.
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If I have an initialized array in Java and I want to do a method to one element in that array I would do
array[n].method();
but how do I do the same thing with an arraylist?
arraylist[n].method() gives me an error.
With Java use get method with ArrayList:
arraylist.get(n).method();
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I am trying to print this integer 12345679 like 1,234,68. I was trying to do like this.
System.out.println(count+" "+"$"+fm.format(NumberFormat.getNumberInstance(Locale.US).format(avg)));
How can I do this in java??
NumberFormat currencyInstance = NumberFormat.getCurrencyInstance(Locale.US);
currencyInstance.setMaximumFractionDigits(0);
System.out.println(currencyInstance.format(12345679));
Output: $12,345,679
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I've got many resources with names based on a pattern:
R.drawable.small_house_red
R.drawable.small_house_blue
R.drawable.big_house_black
R.drawable.small_tree_red
I've got 3 strings: size, type, color. I can put all required resources to map, and get them by concated string but is it possible to get them without manually entering all combinations to the map?
You can use this
int id = context.getResources().getIdentifier("imageNameAsString", "drawable", context.getPackageName());