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Thread: filling an array with strings

  1. #1
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    Default filling an array with strings

    Hi,

    I am trying to fill an array with strings but the code does not work:

    	static int numStudents = 20;
        Student[] students = new Student[numStudents];
        String theFiller = "0";
     
    	Arrays.fill(students, theFiller);

    I am getting:

    Exception in thread "main" java.lang.ArrayStoreException: java.lang.String
    at java.util.Arrays.fill(Arrays.java:2710)
    at java.util.Arrays.fill(Arrays.java:2685)
    at StudentDatabase.addStudent(StudentDatabase.java:90 )
    at StudentDatabase.main(StudentDatabase.java:51)

    when I try to use for loop:

    		for (int i=0; i<length; i++)
    		{
    			students[i] = "0";
     
    		}
    I am getting "incompatible types"

    I have set/get methods set for class Student, can you help me prefill this array please?


  2. #2
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    Default Re: filling an array with strings

    Can we see the Student class?

    The first part of the code seems to be correct. Make sure you import java.util.Arrays;

    Why are you doing students[i] = "0"; in the for loop?

    Arrays.fill(students, theFiller); is filling the Array with the theFiller value.

    If you want to print out the contents of the Array, try:

    		for (int i = 0; i < students.length; i++) {
    			System.out.println(students[i]);
    		}

    I have moved this thread to - Collections and Generics - Java Programming Forums
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  3. #3
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    Default Re: filling an array with strings

    Student class


    import java.io.*;
    import java.util.*;
     
    public class Student
    {
      private String firstName;
      private String lastName;
      private String enrollmentDate; // better would be to use util.Date not String ??
      private Scanner scan;
     
      // default constructor - initializes default attr values
    	public Student()
       	{
       	}
     
        public Student(String newFirstName, String newLastName, String newEnrollmentDate)
        {
          this.firstName = newFirstName;
          this.lastName = newLastName;
          this.enrollmentDate = newEnrollmentDate;
        }
     
    //setters
    	public void setFirstName (String newFirstName)
    	{
    		firstName = newFirstName;
    	}
     
    	public void setLastName (String newLastName)
    	{
    		lastName = newLastName;
    	}
     
    	public void setEnrollmentDate (String newEnrollmentDate)
    	{
    		enrollmentDate = newEnrollmentDate;
    	}
     
    //getters
        public String getFirstName()
        {
          return firstName;
        }
     
        public String getLastName()
        {
          return lastName;
        }
     
        public String getEnrollmentDate()
        {
          return enrollmentDate;
        }
     
    }

    my code is not working with:

    Arrays.fill(students, theFiller);

    the error what I have is:

    Exception in thread "main" java.lang.ArrayStoreException: java.lang.String
    at java.util.Arrays.fill(Arrays.java:2710)
    at java.util.Arrays.fill(Arrays.java:2685)
    at StudentDatabase.addStudent(StudentDatabase.java:88 )
    at StudentDatabase.main(StudentDatabase.java:48)

  4. #4
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    Default Re: filling an array with strings

    ArrayStoreException - Is generated if the specified value is not of a runtime type that can be stored in the specified array.

    The specified array needs to be a String. If you updated it to:

    String[] students = new String[numStudents];

    The Array.fill() would work. You need to think about your logic and what you are trying to do..
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