When I leave a comment (vote with comment ) under someone post , it will increase 2 points for vote up and 0 point for vote down. After I leave the comment and click the vote up button, the user earn 2 points. But after I vote down again, the comment get removed but the user still earning 2 points. The two points should be deducted too, no ?
First of all, I would like to say that the interface is nice, amazing, and user friendly!! Thanks Dani and those who work hard on this !!!
But one thing I would like to comment is about the vote and comment. It seems like only users with high reputation allow to use this feature because I get this message when I click the vote up button
Oops! You do not have the permissions required to access this page. Would you like to go back?
Since this feature is not available to all users, why not just make it visible for those users only ?
class Solution {
public int solution(int[] A) {
int n = 0;
while (contains(A, ++n)) ;
return n;
}
public static boolean contains(int[] arr, int item) {
for (int n : arr) {
if (item == n) {
return true;
}
}
return false;
}
public static void main(String[] args) {
Solution s = new Solution();
int[] intArray = new int[]{5, 3, 2, 10};
int ans = s.solution(intArray);
System.out.println(ans);
}
}
that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does not occur in A.
For example, given A = [1, 3, 6, 4, 1, 2], the function should return 5.
Given A = [1, 2, 3], the function should return 4.
Given A = [−1, −3], the function should return 1.
Write an efficient algorithm for the following assumptions:
N is an integer within the range [1..100,000]; each element of array A is an integer within the range [−1,000,000..1,000,000].
This is what I have tried
class Solution {
public int solution(int[] A) {
int minValue = A[0];
do {
for (int i = 0; i < A.length; i++) {
if (A[i] < minValue) {
minValue = A[i];
}
}
} while (contains(A, ++minValue) == true);
return minValue;
}
public static boolean contains(int[] arr, int item) {
for (int n : arr) {
if (item == n) {
return true;
}
}
return false;
}
public static void main(String[] args) {
Solution s = new Solution();
int[] intArray = new int[]{1, 3, 6, 4, 1, 2};
int ans = s.solution(intArray);
System.out.println(ans);
}
}
I get infinity loop, no result displayed. Can someone please point me out what is wrong here ?
Hey guys, I have a little bit confused on below code and output
Main
public class Main {
public static void main(String[] args) {
ClassA classA = new ClassA();
System.out.println("====== Before =====");
classA.checking();
System.out.println("===== After =====");
classA.checking();
}
}
Class A
public class ClassA {
boolean b = true;
public String checking() {
System.out.println("B value is " + b);
if (b = true) {
System.out.println("B is true");
b = false;
} else {
System.out.println("B is false");
}
return null;
}
}
Output
====== Before =====
B value is true
B is true
===== After =====
B value is false
B is true
Why the last line of value B in After will change from false to true ?
To solve this, I need to move the data that need to be inserted to Processor.
public class Processor implements ItemProcessor<A, A> {
@Override
public A process(A i) throws Exception {
System.out.println("Processing..." + i);
i.setId("123");
i.setStatus("Active");
return i;
}
}
I trying to write a spring batch using SpringBoot. At first the program will read data from database, then write it to .csv file format.
This is the code I have tried
Reader
@Bean
public ItemReader<A> Reader() throws Exception {
List list = new ArrayList<>();
JdbcCursorItemReader<A> reader = new JdbcCursorItemReader<A>();
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
String sql = "SELECT ID AS id FROM TABLE_A ";
list = jdbcTemplate.query(sql, new Mapper()); // store all retrieved data to list
reader.setSql(sql);
reader.setDataSource(dataSource);
reader.setRowMapper(new Mapper());
if (list != null) {
for (A c : (List<A>) list) {
c.setId("123"); // overwrite the id
c.setState("Active");
}
}
return reader;
}
Mapper
public class Mapper implements RowMapper<A> {
@Override
public A mapRow(ResultSet rs, int rowNum) throws SQLException {
A c = new A();
c.setId(rs.getString("id"));
}
When I check the generated file, I can see the value id from database, but not 123. Value for the State is also empty . How can I overwrite the mapping value ?
I feel hard to understand how the LayoutManager work even the GUI is quite simple. I trying to make the button place below the Tel No JTextField, but it placed beside Address JTextField , not below TelNo JTextField.
package gui;
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;
import javax.swing.SwingUtilities;
public class OrderPage extends JPanel {
public static void main(String[] args) {
OrderPage order = new OrderPage();
order.createAndShowGUI();
JFrame frame = new JFrame();
frame = new JFrame();
frame.setTitle("Details");
frame.getContentPane().add(order);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public void createAndShowGUI() {
String[] labels = { "Name: ", "Address: ", "Tel No: " };
int numPairs = labels.length;
// Create and populate the panel.
JPanel p = new JPanel(new SpringLayout());
JPanel p1 = new JPanel(new BorderLayout());
JButton button = new JButton("Confirm");
p1.add(button, BorderLayout.SOUTH);
for (int i = 0; i < numPairs; i++) {
JLabel l = new JLabel(labels[i], JLabel.TRAILING);
p.add(l);
JTextField textField = new JTextField(25);
l.setLabelFor(textField);
p.add(textField);
}
add(p);
add(p1);
// Lay out the panel.
SpringUtilities.makeCompactGrid(p, numPairs, 2, // rows, cols
6, 6, // initX, initY
6, 6); // xPad, yPad
}
}
Write a program that read an integer and display its smallest prime factors in ascending order. For example, if the input is 60, the output should be 2,3,5... I came out with below code, but I get 2 2 3 5.How to have only one 2 ?
package chapter4;
import java.util.Scanner;
public class Exercise4_16 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter an integer: ");
Exercise4_16 exe = new Exercise4_16();
int value = input.nextInt();
exe.primeFactors(value);
}
public void primeFactors(int value) {
while (value % 2 == 0) {
System.out.print(2 + " ");
value = value / 2;
}
for (int i = 3; i <= Math.sqrt(value); i = i + 2) {
while (value % i == 0) {
System.out.print(i + " ");
value /= i;
}
}
if (value >= 2) {
System.out.print(value);
}
}
}
