You never call your method “forloop()”, that’s the reason why there’s nothing printed. NewbieJavaDeveloper’s answer is a good one. But if you want to pactice “method and return”, here is another answer: import java.util.Scanner;//import scanner so user can input class arrays { public static void main(String[] param) { String[] animals = arrays(); forloop(animals); System.exit(0); } … Read more
Try this code final EditText emailEditTxt= (EditText)findViewById(R.id.text); String emailStr = emailEditTxt.getText().toString().trim(); if(emailStr!=null) if(emailStr.length()>=1){ String emailPattern = “[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+”; if (emailStr .matches(emailPattern)) { Toast.makeText(getApplicationContext(),”valid email address”,Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getApplicationContext(),”Invalid email address”, Toast.LENGTH_SHORT).show(); } } solved Email validation only when field is not blank in Android
You can’t insert @SuppresWarnings on a return statement. In java 8 you can annotate only classes, methods/constructors, fields, parameters and (new in java 8) local variables. So in your case java can’t parse what you have written. Move the @SuppressWarnings at the method level. 1 solved Weird result from “@SuppressWarnings”
I figured out how to achieve the same thing by myself, even though I enjoyed the “Just learn Go” answers I got. It’s solved by creating a wrapper function userLoggedInWebEntry that takes in a WebEntryUserLoggedIn function signature, but returns a WebEntry function signature. It achieves the same thing as the Java inheritance code above, by … Read more
That means that you try to access A[20] even though it doesn’t exist When i equals 19, the following line becomes a problem: A[i] = A[i + 1] + K; Use 19 insead of 20 in your loop and it should be fine. You need to decide what to do with A[19] though, as it’s … Read more
Take a look at the imports in mainController.java: They don’t contain an import for javafx.scene.text.TextFlow and textflow.TextFlow is used instead. You need to add an import to javafx.scene.text.TextFlow. In addition consider renaming your TextFlow class. Using the same type names as types in the API you use can easily lead to confusion. When mainController‘s constructor … Read more
Upcasting is always a codesmell and should be avoided. Usually it is needed because the code design violated the Tell, don’t ask! principle. Just guessing: In your case the “procution code” always passes instaces of class A so that it works. But your test obviously sets up a class B object (at some point you … Read more
First, the label for radios is not shown, because you don’t create it and add it to panel. Create it and add it to panel before radioB1. Also, you should add some invisible (empy) label before radioB2 (or use some other filler component to fill the cell – perhaps this could help: http://docs.oracle.com/javase/tutorial/uiswing/layout/box.html#filler). Also, you … Read more
You shouldn’t set android:divider=”” or android:dividerHeight=”” in your listview. I recommend you use recyclerview instead of listview. 1 solved cardview with listview, ugly line between items
Like you said, class is a blueprint; objects are made using those blueprints. Its like you have a blueprint of a car – you have one blueprint, but many cars based on that blueprint. solved Java, why are objects known as instances of a class?
Filters help you to intercept the incoming request and response. Request filters can: perform security checks, reformat request headers or bodies, audit or log requests, Response filters can: compress the response stream, append or alter the response stream, create a different response altogether. solved What are the real time usage of Filter concept in Java … Read more
I want to use regular expression in contains method. How can I use it you can not use regex in contains method solved Can I use regular expression in contains method [duplicate]
Problem is in the actionPerformed() method. The class variable patient is null. You can do a null check like this… public void actionPerformed(ActionEvent e) { if(e.getSource() == reportButton && patient != null) { System.out.println(“I’m Clicked!”); patient.setAge(ageField, log); } } Or you can initalize the variable… public void actionPerformed(ActionEvent e) { if (patient == null) { … Read more
You are returning an array. The salary is in the the first position of you array. If you want to see the salary you would need to use return salary[0]; in your method. or System.out.println(calculateSalary(salary,riseRate)[0]); in the main. What you’re trying to print right now is the actual array, not a value. I am not … Read more
I assume that the isHttps variable check is there for a reason(?) and therefore the second cast should actually be HttpURLConnection, meaning there is a typo in the question? If so the most methods used in the question are available in the parent class URLConnection without a cast, but not all. Fortunately HttpsURLConnection is a … Read more