java

[Solved] Filtering City by state in java – Using Array

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Sorry everyone for my uncompleted question. My point is, when I select some value in my menu, this have to change another menu with the values in referente: Front Implementation: <h:panelGroup layout=”block” class=”col-md-3″ id=”panel-state”> <label>#{msg[‘state’]}</label> <h:selectOneMenu id=”mdl-state” value=”#{saisReportQueryBean.reportQuery.state}” binding=”#{uf}” class=”form-control input_no_round_corner”> <f:selectItem itemValue=”#{null}” itemLabel=”#{msg[‘select_state’]}” noSelectionOption=”true” /> <f:selectItems value=”#{saisReportQueryBean.keyState}” var=”estado” itemValue=”#{estado}” itemLabel=”#{estado}” /> <f:ajax listener=”#{saisReportQueryBean.UpdateCityByState(uf.value)}” render=”:panel-city” … Read more

[Solved] Why Bitset allows values distinct from 1 and 0?

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BitSet logically represents a “vector of bits that grows as needed” (javadoc). When you create it via new BitSet(), you have all bits set to 0 (false). 0 5 10 | | | 000000000000… (virtually infinite sequence) Using set(x) you set to 1 (true) the bit at position x (where the first position is 0); … Read more

[Solved] Why does SimpleDateFormat() return wrong month?

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As noted by other people, there are two problems in your current code: Months are zero based. So, month 7 is August, not July =\ Year doesn’t start by default at 1900 but at 1970, but if you set the year by yourself you’ll get as year the same number you’re setting, in this case, … Read more

[Solved] What’s wrong to have empty lines in Java class? [closed]

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Not at all. Empty lines do not matter at runtime, as the java compiler turns your source code into bytecode in the very first place. The only “consequence” of using empty lines will be the line number information that the compiler can include in the bytecode files. More empty lines, resulting in higher numbers. But … Read more

[Solved] Programmatically get the time at clock-change [closed]

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To find out DST transitions, you could access Olson timezone database e.g., to find out the time of the next DST transition, in Python: #!/usr/bin/env python from bisect import bisect from datetime import datetime import pytz # $ pip install pytz def next_dst(tz): dst_transitions = getattr(tz, ‘_utc_transition_times’, []) index = bisect(dst_transitions, datetime.utcnow()) if 0 <= … Read more

[Solved] Java, Exception kinda [closed]

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To create an Exception in Java, you could do something like this: class GameException extends Exception { GameException() { super(); } GameException(String msg) { super(msg); } GameException(String msg, Throwable cause) { super(msg, cause); } GameException(Throwable cause) { super(cause); } } To use this Exception, you can do the following: if(!checkNumbers(num1, num2)) throw new GameException(); Where … Read more

[Solved] trying to fix this method in my class to, I think maybe try-catch, but the goal is to make the user only be able to enter 1-9

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There are a few mistakes in your logic. Let’s try this: public int move() { // make it so they can only choose 1-9 System.out.print(“Where do you want to move? “); Scanner in = new Scanner(System.in); int move = in.nextInt(); while (move < 1 || move > 9) { System.out.println(“that move is invalid must be … Read more

[Solved] Java program to build and run a maven project [closed]

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You can follow below approach to start: Create a batch/shell file to build your project using mvn/ant/gradle command. You would need Maven/Ant/Gradle installed in your system and environment variable needs to be setup properly. Run This batch/shell file using java by taking advantage of Runtime Class. Runtime.getRuntime().exec(“cmd /c start build.bat”); To schedule your java program, … Read more

[Solved] How to calculate shortest distance from path?

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Mathematically : As explained in wikipedia the shortest distance between a line and a dot, can be calculated as follows: If the line passes through two points P1=(x1,y1) and P2=(x2,y2) then the distance of (x0,y0) from the line is: Java implimentaion class Point { double x,y; Point(double pX, double pY){ this.x= pX; this.y= pY; } … Read more