java.lang.class

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . I'm facing problem when I run the app on my mobile and when I run the error with stack trace or with debug option there is no error so I don't know what to do Here's the error message Error:Execution failed for task ':app:transformClassesWithInstantRunForDebug'. java.lang

问题 This question already has answers here : How to do an Integer.parseInt() for a decimal number? (9 answers) Closed last year . System.out.println("Enter a number: "); String in1 = input.nextLine(); Integer input1 = Integer.valueOf(in1); Float input2 = Float.parseFloat(in1); Double input3 = Double.valueOf(in1).doubleValue(); System.out.println(); System.out.println("Enter another number: "); String in2 = input.nextLine(); Integer input21 = Integer.valueOf(in2); Float input22 = Float.parseFloat

问题 I have started reading Joshua Bloch's "Effective Java" (second edition). While reading item 2 ( Consider a builder when faced with many constructor parameters ), there is a particular statement that the author makes w.r.t the Class.newInstance() method. Specifically, the author says that The traditional Abstract Factory implementation in Java has been the "Class" object, with the "newInstance" method playing the part of the "build" method. This part has me confused a little bit - my

问题 * I am trying to add items to the list view dynamically. But, I am getting a run time exception.Please help. Is there a problem with the global variable "values"? I tried to debug by printing the logs and I am able to see the values stored in the variable * public class FriendsActivity extends ListFragment implements TabListener { private Fragment mFragment; private String[] values; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActivity()

问题 * I am trying to add items to the list view dynamically. But, I am getting a run time exception.Please help. Is there a problem with the global variable "values"? I tried to debug by printing the logs and I am able to see the values stored in the variable * public class FriendsActivity extends ListFragment implements TabListener { private Fragment mFragment; private String[] values; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActivity()

问题 Hey guys I'm trying to create a loop until a correct character choice is entered by the user. When I enter a wrong choice I get the error java.lang.NullPointerException. It might be with the way I'm inputing but I don't want to change that if I don't have to. choice is a private member of the class. char wf() { Scanner input = new Scanner(System.in); System.out.println("What is your choice? (x/o)"); choice = input.findInLine(".").charAt(0); while (choice != 'x' && choice != 'o') { System.out

问题 I am trying to run a standalone java program using log4j, but receiving below while debugging (with no log4j related logs on console): log= {Logger@1343} "java.lang.Class:ERROR in 18b4aac2" Can someone please suggest what is wrong here? The code is as below: import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.core.Logger; import java.io.IOException; import java.sql.SQLException; public class log4jExample { static org.apache.logging.log4j.Logger log = LogManager

问题 Is java.lang.Class the same as the actual .class file? i.e. is the content equivalent? I want to send the .class over socket, and was wondering if instead of trying to find and load the actual .class file, if I could just transmit the java.lang.Class instead? Elaboration (read if you want more info) Suppose I have a Java class called SomeObj. When this file is compiled, a file called SomeObj.class will be generated. We also know that if I have SomeObj as a type, we could get its java.lang

问题 I need help with android project inside NetBeans. I Just opened project which is created in NetBeans and I have some issues with "cannot access java.lang Fatal Error: Unable to find package java.lang in classpath or bootclasspath" This is sample of one my file which have issues: package Helpers; import PreglednikLogika.Clanak; import android.content.Context; The first line package Helpers; is underlined and produce "cannot access java.lang Fatal Error: Unable to find package java.lang in

问题 This is a Constructor that I have for a test average class. My assignment asks me to bring in an array-list of test score and as input validation, it wants me to use a try catch statement to catch any input under 0 and over 100. The constructor below is bringing in an array-list from my main with out any error. However, it is not catching a negative input. I been looking at this code for over two hours and I can't figure it out. I thought a fresh pair of eyes could probably see why it is not