empID cannot be resolved or is not a field

Programming Questions

clankill3r

empID cannot be resolved or is not a field

in Programming Questions • 2 years ago

How, every tutorial i try ends up in not working, i thought processing was basicly java.

I get empID cannot be resolved or is not a field

The error brings me to a empty line instand of a line where you can read empID.

And i never mistyped empID...

import java.util.*;
class TestEmployeeSort{
public static void main(String[] args) {
List coll = Util.getEmployees();
Collections.sort(coll); // sort method
printList(coll);
}
private static void printList(List<Employee> list) {
println("EmpId\tName\tAge");
for (Employee e: list) {
println(e.getEmpId() + "\t" + e.getName() + "\t" + e.getAge());
}
}
}
public class Util {
List<Employee> getEmployees() {
List<Employee> col = new ArrayList<Employee>();
col.add(new Employee(5, "Frank", 28));
col.add(new Employee(1, "Jorge", 19));
col.add(new Employee(6, "Bill", 34));
col.add(new Employee(3, "Michel", 10));
col.add(new Employee(7, "Simpson", 8));
col.add(new Employee(4, "Clerk",16 ));
col.add(new Employee(8, "Lee", 40));
col.add(new Employee(2, "Mark", 30));
return col;
}
}
void setup() {
}
void draw() {
}
class Employee implements Comparable<Employee> {
int empId;
String name;
int age;
Employee(int empId, String name, int age) {
this.empId = empId;
this.name = name;
this.age = age;
// set values on attributes
}
// getters & setters
public int compareTo(Employee o){
return this.empID - o.empID;
}
}

Replies(3)

clankill3r

Re: empID cannot be resolved or is not a field

2 years ago

another one (tutorial).

I got it running without a error but nothing gets printed to the console:

http://www.java2s.com/Code/Java/Apache-Common/ComparatorExampleForUserDefinedClass.htm

the other was from here:

http://lkamal.blogspot.com/2008/07/java-sorting-comparator-vs-comparable.html

and getting 5 to work of this one would also be nice:

http://onjava.com/pub/a/onjava/2003/03/12/java_comp.html

i go bang my head against a wall

//import org.apache.commons.collections.comparators.ComparatorChain;
import java.util.Arrays;
import java.util.Comparator;
public class ComparatorExampleForUserDefinedClass {
public static void main(String args[]) {
prepareData();
ComparatorChain chain = new ComparatorChain();
chain.addComparator(new NameComparator());
chain.addComparator(new NumberComparator());
printArray(dataArray);
Arrays.sort(dataArray, chain);
printArray(dataArray);
}
private static void prepareData() {
dataArray[0] = "S4";
dataArray[1] = "Sa";
dataArray[2] = "K";
dataArray[3] = "K4";
dataArray[4] = "W";
dataArray[5] = "Sha";
dataArray[6] = "War";
}
private static void printArray(String[] array) {
println("---- Elements in Array ---- ");
for(int i = 0; i < array.length; i++) {
print(array[i] + ", ");
}
println("");
}
private static String[] dataArray = new String[7];
}
void setup(){
}
class NameComparator implements Comparator {
public int compare(Object o1, Object o2) {
if(o1 instanceof String && o2 instanceof String) {
String s1 = (String)o1;
String s2 = (String)o2;
s1 = s1.substring(0, s1.indexOf("-"));
s2 = s2.substring(0, s2.indexOf("-"));
return s1.compareTo(s2);
}
return 0;
}
}
class NumberComparator implements Comparator {
public int compare(Object o1, Object o2) {
if(o1 instanceof String && o2 instanceof String) {
String s1 = (String)o1;
String s2 = (String)o2;
Integer i1 = new Integer(s1.substring(s1.indexOf("-"), s1.length()));
Integer i2 = new Integer(s2.substring(s2.indexOf("-"), s2.length()));
return i1.compareTo(i2);
}
return 0;
}
}

PhiLho

Re: empID cannot be resolved or is not a field

2 years ago

OK, I keep the thread because you show links to tutorials, but you were answered in the original thread http://forum.processing.org/topic/sort-1-sort-2

To answer your questions:

" And i never mistyped empID..."

class Employee implements Comparable<Employee> {
int empId;

Remember that Java is case sensitive!

" I got it running without a error but nothing gets printed to the console:"
Indeed, you do nothing in setup(). You must instantiate classes and use them.

clankill3r

Re: empID cannot be resolved or is not a field

2 years ago

I need more sleep, sorry, i should have seen that error.
I go work on the sort and sort2 today.

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