Since Input of ENTITY and of it's attribute is ok
I am trying to op the value of the entity and it's attribute details
so my modified code abt ENTITY is:
package datamodel;
import java.io.*;
import java.util.*;
public class ENTITY{
String entity_name;
int no_of_attribute;
int no_of_entity;
attribute attr1;
public ENTITY(String ename,int nofattr,int nofentity)throws IOException
{
entity_name=ename;
no_of_attribute=nofattr;
no_of_entity=nofentity;
}
attribute[] attr=new attribute[no_of_attribute];
public void setAttributeValues()throws IOException,java.lang.ArrayIndexOutOfBoundsException
{
System.out.println("We are prompting for entering data....");
for(int i=0;i<no_of_attribute;i++)
{
attr[i]=new attribute();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the name of the attribute=");
attr[i].name=br.readLine();
System.out.print("Enter the key of the attribute=");
attr[i].key=br.readLine();
System.out.print("Enter the datatype of the attribute=");
attr[i].datatype= br.readLine();
System.out.print("Enter the not_null property (y/n) of the attribute=");
if(br.readLine().equals("Y") || br.readLine().equals("y"))
{
attr[i].not_nul=true;
}
else
{
attr[i].not_nul=false;
}
System.out.print("Enter the default value of the attribute=");
attr[i].default_value=br.readLine();
System.out.print("Enter the check for the attribute=");
attr[i].check=br.readLine();
System.out.print("Enter the uniqueness(y/n) of the attribute=");
if(br.readLine().equals("Y") || br.readLine().equals("Y"))
{
attr[i].unique=true;
}
else
{
attr[i].unique=false;
}
System.out.print("Enter the comment of the attribute=");
attr[i].comment=br.readLine();
System.out.print("Enter the multivalue(y/n) of the attribute=");
if(br.readLine().equals("Y") || br.readLine().equals("Y"))
{
attr[i].multivalue=true;
}
else
{
attr[i].multivalue=false;
}
}
}
public void getAttributeValues(){
for(int i=0;i<no_of_entity;i++){
System.out.println("Name Of Entity="+this.entity_name);
for(int j=0;j<no_of_attribute;j++){
System.out.println("The name of the attribute="+this.attr[i].name);
System.out.println("The key of the attribute="+this.attr[i].key);
System.out.println("The datatype of the attribute="+this.attr[i].datatype);
System.out.println("The not_null property (y/n) of the attribute="+this.attr[i].not_nul);
System.out.println("The default value of the attribute="+this.attr[i].default_value);
System.out.println("The check for the attribute="+this.attr[i].check);
System.out.println("The uniqueness(y/n) of the attribute="+this.attr[i].unique);
System.out.println("The comment of the attribute="+this.attr[i].comment);
System.out.println("The multivalue(y/n) of the attribute="+this.attr[i].multivalue);
}
}
}
}
where bold is function which op the value stored into the entity
to call the function I have written another change in the erd.java (where the main class remains)code:
package datamodel;
import java.io.*;
import java.util.*;
public class erd {
public static void main(String args[])throws IOException{
String ename;
int nofentity;
int nofattr;
System.out.print("Enter no. of entities=");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
nofentity=Integer.parseInt(br.readLine());
ENTITY[] e=new ENTITY[nofentity];
for(int i=0;i<nofentity;i++)
{
System.out.print("Enter name of entity=");
ename=br.readLine();
System.out.print("Enter no. of attributes=");
nofattr=Integer.parseInt(br.readLine());
e[i]=new ENTITY(ename,nofattr,nofentity);
e[i].setAttributeValues();
[B]e[i].getAttributeValues();[/B]
}
}
}
My problem is when I put the line: attribute[] attr=new attribute[no_of_attribute]; inside of the function public void setAttributeValues() in the class ENTITY a lot of compilation error is detected because getArrtibuteValues() does not get the array (because the array is local member of the fn setAttributeValues()) but after omitting the the function setAttributeValues() all input are inputted smoothly. When I put the line attribute[] attr=new attribute[no_of_attribute]; outside any function(as shown in this code) then ArrayIndexOutOfBoundException shown in line: attr[i].name=br.readLine(); when I input the values of the arribute of the entity. throwing of the exception doesnot result any fruitful
plz suggest me something what modification I should do in our code of ENTITY class to avoid such exception
