I am new in java.. I am having a problem when doing merge sort. This is my coding...
Java Code:
import java.util.*;
public class Person
{
public static void main(String[] args)
{
String[] list = {"
[Code] ....
the error is incompatible type at 'sorted = merge(left,right);'
How do i make this merge sort take on random numbers in an array instead of hard coding the numbers
Integer [] a = {8, 2, 6, 7, 5, 4, 3, 1};
mergeSort(a);
System.out.println(Arrays.toString(a));
}
public static void mergeSort (Comparable [] a){
[code]....
I have been working on getting the merge sort working, I have a complteted code but am not getting the right results... Here is my code and the results are "876323149" ...
public class MergeSort
{
private static int[] local; // for use in copying
private static int[] a;
public static void main(String[] args) {
int[] test = {2,3,1,4,7,8,6,3,9};
[Code] ....
Merge sort implementation on the given array i listed in the code below. I know Arrays.sort() or Collections.sort() could do the trick but i want to achieve it through merge sort.
import java.util.*;
public class Merge{
public static void main(String[] args){
String[] myStringArray=new String[]{"z","a","z","b","c","e","z","f"
,"g","a","w","d","m" ,"x","a","R"
,"q","r","y","w","j","a","v","z","b"};
}
}
I've playing around with linked lists and methods for sorting. So far I've tested the iterative sort, insertion sort, quick sort and they all worked perfectly. Now, I am trying to implement merge sort that would take a linked list of jobs and sort them according to their priority. I found a few solutions on the web, of which I am trying to implemented this one: LeetCode.
My system is a simple one, I do have a linked list of print jobs, each of which has the priority. The following code should sort my print queue and return the link node of the first sorted element. Here's the code.
//defining a job that has priority
public class Job {
private int priority;
[Code]....
The problem I've been trying to solve is that I am getting the stack overflow at line
ListNode<T> h1 = mergeSort(left);
meaning that I am getting into a loop somewhere down through the process of breaking the linked list into half, half or halfs and so on.
I'm having a problem printing out the descending order of my array. The array order goes like (Title,Studio,Year). I try to create to ints with the compareTo method but when the program is run the I get array out of bounds. Could the answer possibly be that in order not not have the out of bounds error, to create a for loop inside of the while?
public class Movie2
{
// instance variables
private int year;
private String Title;
private String Studio;
[code]...
Suppose i have written a method like this
public void myWork(){
mergeSortMyData(); O(nlgn)
....
someProcessing(); O(n^2)
someprocessing2(); O(n^2)
}
then what will be time complexity of my code...according to me it will be O(nlgn + n^2) ...is it correct ?
I have this assignment to write a Merge Sort algorithm using recursion. To start I have a very tough time picturing what is happening when it comes to recursion, but I do understand how merge sorting works. At the moment I feel as though a very good portion of my code is correct, but I am having trouble with the recursion in the main method [ mergeSort(Queue<T> queue) ].
I have another 4 or so hours to pass in my assignment finished or not, and at this point I can honestly say I have no clue how to make my code work. I tried working through the problem on paper with a simple queue of size 3, but even that is a struggle. On paper my code works perfectly fine, so there is definitely something I am missing.
Below is what I have along with my JUnit test.
Java Code:
private Queue<T> output = new Queue<T>();
private Queue<T> output1 = new Queue<T>();
private Queue<T> output2 = new Queue<T>();
public Queue<T> mergeSort(Queue<T> queue) {
// TODO 1
if(queue.size() <= 1) {
return queue;
[Code] .....
import java.util.Scanner;
class potatoes {
public static void main(String[] args){
Scanner user = new Scanner(System.in);
String fname;
fname = user.nextLine;
String newfname = fname.substring(0, 3);
System.out.println(newfname);
}
}
This bit of code isnt working, it has something to do with incompatible types for fname
package input;
import javax.swing.JOptionPane;
public class Input {
public static void main(String[] args) {
int user;
user = JOptionPane.showMessageDialog(null, "Enter Your Age""); ERROR IS HERE
if(user <= 18) {
JOptionPane.showMessageDialog(null, "User is legit");
} else {
JOptionPane.showMessageDialog(null, "User is not legit");
}
}
}
I'm getting this error message :
incompatible types: void cannot be converted to int
unclosed string literal
I am trying to write a program to calculate the monthly amount paid for a mortgage and the total amount but i keep getting this errors Attachment 5998
This is my program:
import static java.lang.Math.pow;
import java.io.*;
import java.util.*;
class MyInput
{ static private StringTokenizer stok;
static private BufferedReader br
= new BufferedReader(new InputStreamReader (System.in));
public static int readInt()
[code]....
int a, b, sum;
System.out.print("the sum is");
Scanner in = new Scanner(System.in);
a = in.nextInt();
b = in.nextInt();
Sum = a + b;
System.out.println("the sum us" + sum);
in "sum = a+b" its says "incompatible types: int cannot be converted to boolean" I dont understand why
What the program must do is to parse the string-declared two-dimensional array for the program to compute the student's scores in their quizzes, but I'm having difficulty in anything with Parsing so I don't know what will be the appropriate codes.
Error: incompatible types: String[][] cannot be converted to int[][]
import java.io.*;
public class Quiz3{
public static void main(String[]args)throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String [][]StudQuiz = new String [5][4];
[Code] ....
How am I able to compute the average of the score if the data that is needed to be computed is in the string-declared array?
import java.lang.Math;
import static java.lang.Math.random;
import java.util.Scanner;
public class LineofCoordinates
{
public static void main( String[] args, String x, String random, String exit, String y, String y2, String x2)
[Code] ....
I have coded three classes ,1 class containing the Main method. I have declared three private data fields in Staff class and two data fields in Address class. The problem is that I am assigning String type data field from the Staff and Address Class through the public set methods to String type array in a public void method in the Main class.
public static void main(String[] args){
// TODO code application logic here
System.out.println("-------------------------------------------------");
System.out.println("Press 1 - 6 To Perform Any One Following Action ");
System.out.println("1. Insert New Contact ");
System.out.println("2. Delete Contact By Name ");
System.out.println("3. Replace Info From Contact ");
System.out.println("4. Search Contact By Name ");
System.out.println("5. Show All Contacts ");
System.out.println("6. Exit Program ");
[Code] ....
I am using netbeans and have an error that reads "incompatible types: String cannot be converted to List<String>"
List<List<String>> fileDArr;
fileDArr = new ArrayList<>();
Scanner tempStringScanner;
try {
for (int i = 0; i < FileDirectory.length; i++) {
[code] .....
I don't understand why I am receiving the error. I thought that .next() returned a String?
Have 2 files File1.csv and file2.csv containing some values. Have to read both files and write unique values in to another file.
In the new the there must be unique rows and not duplicate rows (2 files contain some rows same). What is the best approach for doing this?
So I have two related tables - Country (Master) Projects (Detail). Country has a OneToMany relationship with Projects. I put a link on my AllProjects.xhtml page. When tyhe link is clicked it uses a data model class to to display the current (clicked) project record (projectRecord object). After editing all the details, the UPDATE button calls a merge method in the DAO class. On the first attempt to update, nothing happens and the record is returned as it is with no errors. If I try updating again, I get:
Error Code: 1062
Call: INSERT INTO projects_beta2b_projects_beta2b (projects_PROJECTID) VALUES (?)
bind => [1 parameter bound]
Query: DataModifyQuery(name="projects" sql="INSERT INTO projects_beta2b_projects_beta2b (projects_PROJECTID) VALUES (?)")
[Code] .....
My classes are:
projects.java
@Entity
@Table(name = "projects_beta2b")
public class Projects implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int projectid;
private String projectName;
private String client;
[Code] ...
Is the 'new' keyword in the entity class causing the Inser statement in the DAO because the JPA thinks I want to create a new object therefore invokes INSERT instead of UPDATE?
I searched a lot and got some answers for this Q. but many of them referred to links which give 404 error. I want to make table like this:
Can I make this in Java?
I have a database table containing two columns A and B. They both contain integers. I'd like to know if it's possible, when displaying them in a JTable, to be combined in one column X. I still need, however, to be able to distinguish them from each other when selecting a row from the JTable. E.g. to store each of the values in a a separate variable. Maybe I can combine them when reading from the ResultSet and use some sort of delimiter ? But how?
View Replies View RelatedBelow code I am using to typecast int to char.
char escapeValue = (char)0;
char cha = (char) 10;
escapeValue = (char)(escapeValue * cha); // Here am getting the above error.
I have 38 similar issues in my workspace.
I have a small problem to solve by which I would like to merge 2 sorted maps into 1.
Map A
-------
Keys, Values
1, A
2, B
3, C
4, D
5, E
Map B
-------
Keys, Values
1, 10
2, 20
3, 30
4, 40
5, 50
Final Map should look like:
Keys, Values
A, 10
B, 20
C, 30
D, 40
E, 50
The final map would have all the values from Map A as a key and the values from Map B as values in the Final Map. Is there a way to do this using Java?
I've 2 tables in my MySql DB,Employees and Assets & I want to pick 2 columns Employees and one column from Assets,then how would I display them into a JTable??
View Replies View RelatedIf you have final int i = 1;
short s = 1;
switch(s) {
case i: System.out.println(i);
}
it runs fine. Note that the switch expression is of type short (2 bytes) and the case constant is of type int (4 bytes).My question is: Is the type irrelevant as long as the value is within the boundaries of the type of the switch expression?I have the feeling that this is true since:
byte b = 127;
final int i = 127;
switch(b) {
case i: System.out.println(i);
}
This runs fine again, but if I change the literal assigned to i to 128, which is out of range for type byte, then the compiler complains.Is it true that in the first example the short variable and in the second example the byte variable (the switch expressions) are first implicitly converted to an int and then compared with the case constants?
class Passenger{
String name;
int age;
char gender;
int weight;
public Passenger(){
[Code] ....
This is showing error.....error it gives isthat it cannot change from string type to passenger type......... How to do it??????
Got a problem with generics, which I'm still pretty new at. Here's a program that compiles fine:
import java.util.ArrayList;
import javax.swing.JComponent;
public class Experiments {
public static void main(String[] args) {
ListHolder holder = new ListHolder();
[Code] ....
It's useless, but it compiles. If I change Line 14, however, to add a generic type parameter to the ListHolder class, Line 10 no longer compiles:
import java.util.ArrayList;
import javax.swing.JComponent;
public class Experiments {
public static void main(String[] args) {
ListHolder holder = new ListHolder();
[Code] ....
I get this error:
Uncompilable source code - incompatible types: java.lang.Object cannot be converted to javax.swing.JComponent
at experiments.Experiments.main(Experiments.java:10)
Apparently, the introduction of the type parameter leaves the compiler thinking that aList is of type Object. I can cast it, like this:
JComponent c = ((ArrayList<JComponent>)holder.aList).iterator().next();
That makes the compiler happy, but why is it necessary? How does adding the (unused) type parameter to the ListHolder class end up making the compiler think the aList member of an instance of ListHolder is of type Object?