Question

Suppose there exists a generic Java class named Pair with type parameter T that stores two objects with get and set methods for each. Write the statements necessary to create an object of type Pair with String as its type parameter, and use the set methods to set the two strings, then the get methods to retrieve them for printing.

Answer 1

Code Explanation:

• Defining a class Pair with type parameters "T1 and T2".
• Using a class parameter that defines variables that are "first and second".
• Inside the class, a parameterized constructor is declared that accepts class parameters "first and second".
• Inside the constructor, the "this" keyword holds its value.
• In the next step, the get and set method is declared that accepts value and sets and returns its value.

Code:

public class Pair<T1, T2> //defining a class Pair with type parameters T1 and T2  

{

   private T1 first; //using a class parameter to define the first member of pair

   private T2 second; // using a class parameter to define the second member of pair

   Pair(T1 first, T2 second) //defining parameterized constructor that accepts parameters  

   {

       this.first = first;//using this keyword to accepts first parameters value

       this.second = second;//using this keyword to accepts second parameters value

   }

   public void setFirst(T1 first)//defining setFirst method that sets the first parameter value  

   {

       this.first = first;//using this keyword to accepts first parameter value

   }

   public void setSecond(T2 second)//defining setSecond method that sets second parameter value

   {

       this.second = second;//using this keyword to accepts second parameter value

   }

   public T1 getFirst() //defining getFirst method that return first value

   {

       return first;//return class parameter value

   }

   public T2 getSecond() //defining getSecond method that return second value

   {

       return second;//return class parameter value

   }

}

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