Class A.
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Explanation:
Below is the java code for the ladtract class :-
public class ladtract
{
private double length; //length of tractor
private double width; //width of tractor
public double calculateArea(){
return length*width; //calculate and return the area of the tractor
}
public boolean equals(Object o) {
if (o == this) { //check if it's the same object
return true;
}
if(o.length==this.length && o.width==this.width){ //check if the length and width are same for both objects
return true;
}
return false;
}
public String toString(){
return "Area="+calculateArea(); //return the area of the tractor as a string
}
}
Answer:
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A relationship, in the context of databases, is a situation that exists between two relational database tables when one table has a foreign key that references the primary key of the other table. Relationships allow relational databases to split and store data in different tables, while linking disparate data items.
For example, in a bank database a CUSTOMER_MASTER table stores customer data with a primary key column named CUSTOMER_ID; it also stores customer data in an ACCOUNTS_MASTER table, which holds information about various bank accounts and associated customers. To link these two tables and determine customer and bank account information, a corresponding CUSTOMER_ID column must be inserted in the ACCOUNTS_MASTER table, referencing existing customer IDs from the CUSTOMER_MASTER table. In this case, the ACCOUNTS_MASTER table’s CUSTOMER_ID column is a foreign key that references a column with the same name in the CUSTOMER_MASTER table. This is an example of a relationship between the two tables.
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