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In writeObject of FileOutputStream we declare one String Array that time error are occurs.
My Code is
writeObject(String[] str {"1"});
To begin with, 1 is not a String .
Also, your syntax is not correct to pass the array , try this way :
yourObjectOutputStream.writeObject(new String[] {"1"});
Or if you prefer
String[] str = new String[] {"1"};
yourObjectOutputStream.writeObject(str);
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in end of code is this error what problem? tried many fixes but no ones help
https://i.stack.imgur.com/jwosT.png
return (List<String>) ImmutableList.of();
The problem with this is that the type of ImmutableList.of() is determined before the cast is applied.
The type of ImmutableList.of() in that context is ImmutableList<Object>. An ImmutableList<Object> isn't an ImmutableList<String>.
I'm surprised you need any type hinting here:
return ImmutableList.of();
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How can I generate string const in z3 through java-api? For integer, there are ctx.mkInt(int a) generate an IntExpr with value a and ctx.mkIntConst("a") generate an IntExpr with name "a". However, for string, I can only find ctx.mkString("a"), which is just a SeqExpr with value "a" similar as ctx.mkInt. So what I want is something like ctx.mkStringConst("a") but there is no such function.
I find in python api, what I want is is simply str = String("a")
Try the following.
String variable_name="foo";
Expr variable = context.mkConst(context.mkSymbol(variable_name), context.mkStringSort());
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I have this problem which I looked for into the net and I could be helped... I also looked other Questions and they didnt work i dont know why... So I need your help....
So this is a field in which I create the HashMap:
private HashMap <String,HashSet<String>> userBuisness = new HashMap <String,HashSet<String>>();
And this is my try to add an element (i take a line from a file, i split it and then i add these elements into my HashMap):
String output = inputReader.nextLine();
String fields[] = output.split("\t");
userBuisness.put(fields[0],fields[1]);
As #AndyTurner said in a comment:
fields[1] is a String, not a HashSet<String>. You can build the latter using new HashSet<>(Arrays.asList(fields[1])).
But there are other issues with this snippet too. It would be better to rewrite like this, pay close attention to every little detail that I changed:
private Map<String, Set<String>> userBusiness = new HashMap<>();
...
String[] fields = output.split("\t");
userBusiness.put(fields[0], new HashSet<>(Collections.singletonList(fields[1])));
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Can anyone explain to me how to reverse a number start with zero in java. I trying to reverse a number 025 but output is only 52. But output should be 520
explanation much appreciated.
You are mixing types. "025" is not a number, it's a String. In a number you simply cannot distinguish between 25, 025, 0025, 00025, ... Implement your assignment as a String operation.
public String reverseString(String s) {
// put your code here
}
You may find very useful the Oracle tutorial on Strings here: https://docs.oracle.com/javase/tutorial/java/data/strings.html
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I am getting this error while compiling my code. Please help me with this-
code is
mapConnectionProperties = new HashMap<String, Integer>();
mapConnectionProperties.put(mobileSeriesMappingDTO
.getExternalIP(), mobileSeriesMappingDTO.getExternalPort());
mobileSeriesMappingDTO.getExternalPort() is seemingly a String. Convert it to an Integer.
Integer.parseInt(mobileSeriesMappingDTO.getExternalPort())
Your mobileSeriesMappingDTO.getExternalPort() gives a String,
Transform it to an Integer with :
Integer.parseInt(mobileSeriesMappingDTO.getExternalPort())