Super newbie question here.
I'm taking a course on Udemy and trying to run some of the scripts from the lessons I've taken. As far as I can see, I've entered the script exactly as it's in the lesson video.
Regardless, for some reason, the script just barrels through all of the lines containing Scanner, takes no user input, and somehow runs to the script's end.
I'm using IntelliJ IDEA for all of this. When I run the script, a console window does not even appear for user input.
Below is an example script:
import java.util.Scanner;
public class J4AB_S6_L4 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("The VIP Lounge");
System.out.print("Age:");
int age = scanner.nextInt();
if (age >= 18) {
System.out.println("Do you have a VIP pass? yes/no:");
String vipPassReply = scanner.next();
if (vipPassReply.equals("yes")) {
System.out.println("Thanks, go in.");
}
else {
System.out.println("Sorry you must have a VIP Pass.");
}
}
}
And another script, using Switch.
import java.util.Scanner;
public class J4AB_S6_L7 {
// This is an intro to switch statement syntax.
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int num = scanner.nextInt();
switch (num) {
case 1:
System.out.println("You entered one.");
break;
case 2:
System.out.println("You entered two.");
break;
default:
System.out.println("Dude, why'd you enter that?");
break;
}
}
Why is the script just running through without any user input? Is this a matter of the script itself or IntelliJ IDEA?
Related
I have a test case that performs the following:
#Test
public void testNumber() {
SoftAssert softAssert = new SoftAssert();
List<Integer> nums = Arrays.asList(1,2,3,4,5,6,7,8,9,10);
for (Integer num : nums){
softAssert.assertTrue(num%2==0, String.format("\n Old num : %d", num);
}
softAssert.assertAll();
}
The above test will fail for numbers 1,3,5,7,9
Five statements will be printed in the test report.
If I run the test for a larger data set, I find it difficult to get the count of test data that failed the test case.
Is there any easier way to get the number of test data that failed for a test case using softAssert itself ?
Easy way to find count of test data that failed the test case in SoftAssert itself is not possible.
Alternatively you can think of extending Assertion class. Below is the sample that gives count of test data that failed the test case and prints each failure in new line.
package yourpackage;
import java.util.Map;
import org.testng.asserts.Assertion;
import org.testng.asserts.IAssert;
import org.testng.collections.Maps;
public class AssertionExtn extends Assertion {
private final Map<AssertionError, IAssert> m_errors;
public AssertionExtn(){
this.m_errors = Maps.newLinkedHashMap();
}
protected void doAssert(IAssert a) {
onBeforeAssert(a);
try {
a.doAssert();
onAssertSuccess(a);
} catch (AssertionError ex) {
onAssertFailure(a, ex);
this.m_errors.put(ex, a);
} finally {
onAfterAssert(a);
}
}
public void assertAll() {
if (!(this.m_errors.isEmpty())) {
StringBuilder sb = new StringBuilder("Total assertion failed: "+m_errors.size());
sb.append("\n\t");
sb.append("The following asserts failed:");
boolean first = true;
for (Map.Entry ae : this.m_errors.entrySet()) {
if (first)
first = false;
else {
sb.append(",");
}
sb.append("\n\t");
sb.append(((AssertionError)ae.getKey()).getMessage());
}
throw new AssertionError(sb.toString());
}
}
}
You can use this as:
#Test
public void test()
{
AssertionExtn asert=new AssertionExtn();
asert.assertEquals(false, true,"failed");
asert.assertEquals(false, false,"passed");
asert.assertEquals(0, 1,"brokedown");
asert.assertAll();
}
When I debug an app, in the debug tool window there is a Watches window. I have read this manual over and over, but cannot find any practicle usage of Watches.
Somehow, I think this is a cool and useful tool and I lack from not using it.
Can someone explain when should I use it and give a few samples? Ideally, the description will be bound to a concrete (imaginary) situation so that I better apply it in my work.
This section allows you to define expressions which you'd like to see how they evolve/change with every step of your debug process, without manually inspecting all the available objects and their properties. Let's take the following simple sample which intentionally throws a NullPointerException (NPE):
public class WatchSample {
static class Student {
public static final int CREDITS_REQUIRED_FOR_GRADUATION = 10;
private String name;
private Integer credits;
public Student(String name, Integer credits) {
this.name = name;
this.credits = credits;
}
String getName() {
return name;
}
public boolean hasGraduated() {
return credits >= CREDITS_REQUIRED_FOR_GRADUATION;
}
public Integer getCredits() {
return credits;
}
}
public static void main(String[] args) throws Exception {
List<Student> students = simulateReadingFromDB();
for (Student student : students) {
if (student.hasGraduated()) {
System.out.println("Student [" + student.getName() + "] has graduated with [" + student.getCredits() + "] credits");
}
}
}
private static List<Student> simulateReadingFromDB() {
List<Student> students = new ArrayList<>(3);
students.add(new Student("S1", 15));
students.add(new Student("S2", null)); // <- simulate some mistake
students.add(new Student("S3", 10));
return students;
}
}
At some point in time you may wonder how come you get a NPE and what needs fixing. So just set a breakpoint, add a few watches and carefully step through the lines. Eventually you'll end up with the troublemaker in sight:
Of course this is a basic example and should be taken as such. Within a regular app you'll probably have more complex scenarios and expressions you'd like to inspect, and this will make more sense, for example: if (((position > 0 && position < MAX) || (position < 0 && position > MIN) && (players(currentPlayer).isNotDead() && move.isAllowed()) && time.notUp())..... In this case you can evaluate the sub-expressions to see which one returns false
**Note**: You could also make the breakpoint conditional so that the program will pause only when that specific event occurs:
I'm still very new to Java, so I have a feeling that I'm doing more than I need to here and would appreciate any advise as to whether there is a more proficient way to go about this. Here is what I'm trying to do:
Output the last value in the Arraylist.
Intentionally insert an out of bounds index value with system.out (index (4) in this case)
Bypass the incorrect value and provide the last valid Arraylist value (I hope this makes sense).
My program is running fine (I'm adding more later, so userInput will eventually be used), but I'd like to do this without using a try/catch/finally block (i.e. check the index length) if possible. Thank you all in advance!
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
public class Ex02 {
public static void main(String[] args) throws IOException {
BufferedReader userInput = new BufferedReader(new InputStreamReader(
System.in));
try {
ArrayList<String> myArr = new ArrayList<String>();
myArr.add("Zero");
myArr.add("One");
myArr.add("Two");
myArr.add("Three");
System.out.println(myArr.get(4));
System.out.print("This program is not currently setup to accept user input. The last printed string in this array is: ");
} catch (Exception e) {
System.out.print("This program is not currently setup to accept user input. The requested array index which has been programmed is out of range. \nThe last valid string in this array is: ");
} finally {
ArrayList<String> myArr = new ArrayList<String>();
myArr.add("Zero");
myArr.add("One");
myArr.add("Two");
myArr.add("Three");
System.out.print(myArr.get(myArr.size() - 1));
}
}
}
Check for array index to avoid outofbounds exception:
In a given ArrayList, you can always get the length of it. By doing a simple comparison, you can check the condition you want. I haven't gone through your code, below is what i was talking-
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("stringA");
list.add("stringB");
list.add("stringC");
int index = 20;
if (isIndexOutOfBounds(list, index)) {
System.out.println("Index is out of bounds. Last valid index is "+getLastValidIndex(list));
}
}
private static boolean isIndexOutOfBounds(final List<String> list, int index) {
return index < 0 || index >= list.size();
}
private static int getLastValidIndex(final List<String> list) {
return list.size() - 1;
}
I am a Java Beginner and have a little question.
I have got 2 Classes:
the first one is a java formular, the important code is:
#Override
public void keyPressed(KeyEvent event) {
int key = event.getKeyCode();
if(key == 17) {
System.out.println("STRG");
if(roboter.running == true) {
roboter.running = false;
}
}
}
the second one is a class (called robot) which main part is the for loop:
public class Roboter {
public boolean running = false;
public void myFunction() {
for(...;...;...) {
for(...;...;...) {
if(!running)
break;
// DO SOMETHING IMPORTANT
}
}
}
Well, this doesn't work. I think it is because I can't change the value of running while my for loop. I have no idea how to slove this problem. Maybe there is an other solution? My aim is to stop the robots myFunction if an user press a key.I hope you can help me
I am sorry for my english, if you don't undestand me I will try to rewrite the question.
The class that handles the keyboard input should run in a separate Thread.
I need to write the testcase Pass/Fail status in an Excel report. How do I catch the result in a simple way? In Ant XML/HTML reports status (Success/Failed) is displayed so I believe there must be some way to catch this..may be in the #After Class.
Can anyone help me out with this?
I am using Selenium Webdriver with JUnit4 and using Apache POI(oh its screwing my mind too!) for excel handling. Let me know in case you need more info.
Thanks :)
P.S: As I am asking a lot of questions it would be great if someone can change or suggest me changes to make these questions and threads helpful for others.
I got your problem and this is what I have do in all my test cases now -
In your test case if you want to check if 2 Strings are equal -
You might be using this code -
Assert.assertTrue(value1.equals(value2));
And if these values are not equal an AssertionError is generated.
Instead you can change your code like this -
String testCaseStatus = "";
if(value1.equals(value2)){
testCaseStatus = "success";
}
else{
testCaseStatus = "fail";
}
Now you store this result in your excel sheet by passing the testCaseStatus to your code which adds a line to your excel which you have implemented using Apache POI. You can also handle the conditions of "error" if you implement a try catch block.
For example you can catch some exception and add the status as error to your excel sheet.
Edited part of answer -
I just figured out on how to use the TestResult class -
This is some sample code I'm posting -
This is the test case class called ExampleTest -
public class ExampleTest implements junit.framework.Test {
#Before
public void setUp() throws Exception {
}
#After
public void tearDown() throws Exception {
}
#Test
public void test(TestResult result) {
try{
Assert.assertEquals("hari", "");
}catch(AssertionFailedError e){
result.addFailure(this, e);
}catch(AssertionError e){
result.addError(this, e);
}
}
#Override
public int countTestCases() {
// TODO Auto-generated method stub
return 0;
}
#Override
public void run(TestResult result) {
test(result);
}
}
I call the above test case from this code -
public class Test {
public static void main(String[] args) {
TestResult result = new TestResult();
TestSuite suite = new TestSuite();
suite.addTest(new ExampleTest());
suite.run(result);
System.out.println(result.errorCount());
}
}
You can call many test cases by just adding them to this suite and then get the entire result using the TestResult class failures() and errors() methods.
You can read more on this from here.