Ошибка string cannot be converted to string - Ремонт и установка крупной бытовой техники

I bet you generated the getters and setters and the constructor for the initial set of fields which are these.

// private String suit;
// private String name;
// private int value;

But after changing them to

private String[] suit = { "spades", "hearts", "clubs", "diamonds" };
private String[] name = { "Ace", "Jack", "Queen", "King" };
private int[] value = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };

you forgot to modify them accordingly. You need to change your getters and setters and constructors to something like this. The same goes with the toString() method.

public class Card {

    private String[] suit = { "spades", "hearts", "clubs", "diamonds" };
    private String[] name = { "Ace", "Jack", "Queen", "King" };
    private int[] value = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };

    public Card(String[] suit, String[] name, int[] value) {
        super();
        this.suit = suit;
        this.name = name;
        this.value = value;
    }

    public String[] getSuit() {
        return suit;
    }

    public void setSuit(String[] suit) {
        this.suit = suit;
    }

    public String[] getName() {
        return name;
    }

    public void setName(String[] name) {
        this.name = name;
    }

    public int[] getValue() {
        return value;
    }

    public void setValue(int[] value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "Card [suit=" + Arrays.toString(suit) + ", name="
            + Arrays.toString(name) + ", value=" + Arrays.toString(value)
            + "]";
    }
}

Always remember to generate fresh getters, setters, constructor, toString() methods, if you happen to change the fields in the class.

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when i compile my program i receive this error:
String cannot be converted to String[]

my program is in 2 classes:

main:

import java.util.*;
import java.math.*;

public class esa{
    public static void main(String[]args){
        int [] numeri= new int[4];
        String [] text =new String[4];
        for(int i=0;i<4;i++){
        text[i] = args[i];
        System.out.println(text[i]);
        }
        text=est.conv(text);
    }
}


import java.util.*;
import java.math.*;


public class est{
public static String conv(String [] valori){

    }
}

asked Sep 18, 2014 at 13:54

text=est.conv(text);

est Class has a method conv which takes String[] and returns String.You cannot assign a String to String[]

answered Sep 18, 2014 at 13:58

Kumar AbhinavKumar Abhinav

6,5552 gold badges23 silver badges35 bronze badges

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error: incompatible types: String[] cannot be converted to String

I tried taking input of a 6 by 6 matrix in java using the string split function when the string is input in the following way, and to print the matrix.

1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6

The output that I get is

Main.java:24: error: incompatible types: String[] cannot be converted to String
                                c[j] = b[i].split(" ");

my code:

import java.util.*;
import java.io.*;

class Solution {
    public static void main(String args[]) {
        Scanner s = new Scanner(System.in);
        int a[][] = new int[6][6];
        String b[] = new String[6];

        for (int i = 0; i < 6; i++) {
            b[i] = s.nextLine();
        }

        // initializing the 2d array a[][]
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < 6; j++) {
                String c[] = new String[6];
                c[j] = b[i].split(" ");
                a[i][j] = Integer.parseInt(c[j]);
            }
        }

        // printing the input array
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < 6; j++) {
                System.out.print("ta[i][j]t");
            }
        }
    }
}

pls, suggest how I can overcome this error

Answer

When we call split function of String return the String[]. So c[j] (which is of type String) can’t be equal to String[].

Below code should be replaced as:

// initializing the 2d array a[][]
for (int i = 0; i < 6; i++) {
    String[] c = b[i].split(" ");
    for (int j = 0; j < 6; j++) {
        a[i][j] = Integer.parseInt(c[j]);
    }
}

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Remove From My Forums

Question

When this block of code was converted to C# from C++ it gives the error Cannot implicitly convert type ‘string[*,*]’ to ‘string[]’.The code:

public class _filter_data

{

public string title = new string(new char[256]);

public string category = new string(new char[256]);

public string copyright = new string(new char[256]);

public string author = new string(new char[256]);

public int[] map_enable = new int[4];

public string[] map_label = new string[4, 256]; // error occurs on these lines

public int[] control_enable = new int[8];

public string[] control_label = new string[8, 256]; // error occurs on these lines

public int[] control_value = new int[8];

public string[] source = new string[4, 8192]; // error occurs on these lines

}

The original C++ code:

typedef struct _filter_data

{

char title[256];

char category[256];

char copyright[256];

char author[256];

int map_enable[4];

char map_label[4][256];

int control_enable[8];

char control_label[8][256];

int control_value[8];

char source[4][8192];

}

Is there a problem with the conversion?

Alternatively would there be a way to expose the struct from a managed assembly, if so what would be the managed equvilent of the C++ code.

Any help would be a

ppreciated.

Edited by

Monday, June 16, 2008 3:11 AM
error

Answers

Try
public string [,] source = new ….
- Marked as answer by
  jack 321
  Thursday, June 19, 2008 5:36 AM
public class filter_data

{

public string title = new string(new char[256]);

public string category = new string(new char[256]);

public string copyright = new string(new char[256]);

public string author = new string(new char[256]);

public int[] map_enable = new int[4];

public string[,] map_label = new string[4, 256]; // no error now

public int[] control_enable = new int[8];

public string[,] control_label = new string[8, 256]; // no error now

public int[] control_value = new int[8];

public string[,] source = new string[4, 8192]; // no error now

}
- Marked as answer by
  jack 321
  Thursday, June 19, 2008 5:36 AM

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Hi. Thanks for looking at this.
I am getting this error when trying to define and call this method.

C:UsersBillDesktoptest>javac JavaWekaJ48TestTrainPredReadWriteSQL.java
JavaWekaJ48TestTrainPredReadWriteSQL.java:135: error: method writeToDB in class JavaWekaJ48T
estTrainPredReadWriteSQL cannot be applied to given types;
JavaWekaJ48TestTrainPredReadWriteSQL.writeToDB(«C:/Program Files/Weka-3-7/data/weath
er.nominal.csv»);
^
required: String[]
found: String
reason: actual argument String cannot be converted to String[] by method invocation conversion
1 error
sion

1. It says I need String[] not String. Can you suggest what is wrong?
2. Also, I defined this new method, writeToDB, using public and static. Is this OK?
3. Then I called the method within the class definition using the code
JavaWekaJ48TestTrainPredReadWriteSQL.writeToDB
Is that the correct way to invoke this method?

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import weka.core.Instance;
import weka.core.Instances;
import weka.core.converters.ArffLoader;
import weka.classifiers.bayes.NaiveBayesUpdateable;
 //next three are for writing to the database. Probably you don't need the others since you have '*'
 import weka.core.*;
  import weka.core.converters.*;
  import java.io.*;

import java.io.File;


import weka.classifiers.Evaluation;
import weka.classifiers.trees.J48;
import java.io.BufferedReader;
import java.io.FileReader;
import weka.core.converters.ConverterUtils.DataSource;
import weka.core.Instances;
import weka.experiment.InstanceQuery;

/**
* This example trains NaiveBayes incrementally on data obtained
* from the ArffLoader.
*
* @author FracPete (fracpete at waikato dot ac dot nz)
*/
public class JavaWekaJ48TestTrainPredReadWriteSQL { 


 /**
  * Expects an ARFF file as first argument (class attribute is assumed
  * to be the last attribute).
  *weather.nominalTest.arff
  * @param args        the commandline arguments
  * @throws Exception  if something goes wrong
  */
  
  public static void writeToDB(String[] args){
	
       /*BufferedReader readerTest = new BufferedReader(
         new FileReader("C:/Program Files/Weka-3-7/data/weather.nominalTest.arff"));
        Instances dataTest = new Instances(readerTest);
        readerTest.close();
		
			DataSource sourceTest = new DataSource("C:/Program Files/Weka-3-7/data/weather.nominal.csv");
 Instances dataTest = sourceTest.getDataSet();	

 
	     //Instances data = new Instances(new BufferedReader(new FileReader(args[0])));
		 */
		 DataSource source = new DataSource(args[0]);
 Instances data = source.getDataSet();	
 
      data.setClassIndex(data.numAttributes() - 1);
 
      DatabaseSaver save = new DatabaseSaver();
      save.setUrl("jdbc:mysql://mysql03.ixwebingrnet");
      save.setUser("C261605");
      save.setPassword("Wri");
      save.setInstances(data);
      save.setRelationForTableName(false);
      save.setTableName("weather");
      save.connectToDatabase();
      save.writeBatch();
	
	
	}
 public static void main(String[] args) throws Exception {



     /*   BufferedReader readerTrain = new BufferedReader(
         new FileReader("C:/Program Files/Weka-3-7/data/weather.nominal.arff"));
        Instances dataTrain = new Instances(readerTrain);
        readerTrain.close();
	
//If csv do it this way:	
		DataSource sourceTrain = new DataSource("C:/Program Files/Weka-3-7/data/weather.nominal.csv");
 Instances dataTrain = sourceTrain.getDataSet();
 
 */
 
  InstanceQuery queryTR = new InstanceQuery();
 queryTR.setUsername("C261605");
 queryTR.setPassword("Re");
 queryTR.setQuery("select * from weatherSample");
 // You can declare that your data set is sparse
 // query.setSparseData(true);
 Instances dataTrain = queryTR.retrieveInstances();
		
        /*BufferedReader readerTest = new BufferedReader(
         new FileReader("C:/Program Files/Weka-3-7/data/weather.nominalTest.arff"));
        Instances dataTest = new Instances(readerTest);
        readerTest.close();
		
			DataSource sourceTest = new DataSource("C:/Program Files/Weka-3-7/data/weather.nominal.csv");
 Instances dataTest = sourceTest.getDataSet();	
*/

  InstanceQuery queryTS = new InstanceQuery();
 queryTS.setUsername("C261605");
 queryTS.setPassword("Re");
 queryTS.setQuery("select * from weatherSample");
 // You can declare that your data set is sparse
 // query.setSparseData(true);
 Instances dataTest = queryTS.retrieveInstances();

 if (dataTrain.classIndex() == -1)
dataTrain.setClassIndex(dataTrain.numAttributes() - 1);
if (dataTest.classIndex() == -1)
dataTest.setClassIndex(dataTest.numAttributes() - 1);


        J48 cls = new J48();
        cls.buildClassifier(dataTrain);




Evaluation eval = new Evaluation(dataTest);
eval.evaluateModel(cls, dataTest);
System.out.println(eval.toSummaryString("nResultsn======n", false));
        



 for (int i = 0; i < dataTest.numInstances(); i++) {
   double pred = cls.classifyInstance(dataTest.instance(i));
   System.out.print("ID: " + dataTest.instance(i).value(0));
   System.out.print(", actual: " + dataTest.classAttribute().value((int) dataTest.instance(i).classValue()));
   System.out.println(", predicted: " + dataTest.classAttribute().value((int) pred));
        } 


	JavaWekaJ48TestTrainPredReadWriteSQL.writeToDB("C:/Program Files/Weka-3-7/data/weather.nominal.csv");
 }
}

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