{"id":1229,"date":"2021-10-23T18:01:26","date_gmt":"2021-10-23T18:01:26","guid":{"rendered":"https:\/\/rahulshettyacademy.com\/blog\/?p=1229"},"modified":"2021-11-30T18:44:08","modified_gmt":"2021-11-30T18:44:08","slug":"sdet-interview-questions-part-3","status":"publish","type":"post","link":"https:\/\/rahulshettyacademy.com\/blog\/index.php\/2021\/10\/23\/sdet-interview-questions-part-3\/","title":{"rendered":"Sr.QA and SDET Interview Questions in Java – Part 3"},"content":{"rendered":"

1. How can we achieve Pass by value and pass by reference in Java?<\/a><\/h3>\n

If we consider primitive types in a method, it is always pass by value.<\/p>\n

For non-primitive types, it is always references (Object, Class)<\/p>\n

Consider Non-Primitive<\/strong> Types we can explain how value changes.<\/p>\n

Pass by Value like behavior can be achieved by assigning reference<\/p>\n

Example Code Snippet : Pass by value like behavior<\/strong><\/p>\n

\/\/ Works like pass by value<\/span><\/p>\n

class Test<\/span><\/p>\n

{<\/span><\/p>\n

    int x;<\/span><\/p>\n

    Test(int i) { x = i; }<\/span><\/p>\n

    Test()      { x = 0; }<\/span><\/p>\n

}<\/span><\/p>\n

public class Main<\/span><\/p>\n

{<\/span><\/p>\n

    public static void main(String[] args)<\/span><\/p>\n

    {<\/span><\/p>\n

          \/\/ t is a reference<\/span><\/p>\n

          Test t = new Test(5);<\/span><\/p>\n

          \/\/ Reference is passed and a copy of reference<\/span><\/p>\n

          \/\/ is created in change()<\/span><\/p>\n

          change(t);<\/span><\/p>\n

          System.out.println(t.x);<\/span><\/p>\n

    }<\/span><\/p>\n

    public static void change(Test t)<\/span><\/p>\n

    {<\/span><\/p>\n

          t = new Test(); \/\/ Changes doesn’t reflect, since assigning reference<\/span><\/p>\n

          t.x = 10;<\/span><\/p>\n

    }<\/span><\/p>\n

}<\/span><\/p>\n

\/\/Output:5<\/span><\/strong><\/p>\n

Example Code Snippet : Pass by Reference behavior can be achieved if we don\u2019t assign the reference<\/strong><\/p>\n

\/\/ Behaves like pass by reference<\/span><\/p>\n

class Test<\/span><\/p>\n

{<\/span><\/p>\n

    int x;<\/span><\/p>\n

    Test(int i) { x = i; }<\/span><\/p>\n

    Test()      { x = 0; }<\/span><\/p>\n

}<\/span><\/p>\n

public class Main<\/span><\/p>\n

{<\/span><\/p>\n

    public static void main(String[] args)<\/span><\/p>\n

    {<\/span><\/p>\n

          \/\/ t is a reference<\/span><\/p>\n

          Test t = new Test(5);<\/span><\/p>\n

          \/\/ Reference is passed and a copy of reference<\/span><\/p>\n

          \/\/ is created in change()<\/span><\/p>\n

          change(t);<\/span><\/p>\n

          System.out.println(t.x);<\/span><\/p>\n

    }<\/span><\/p>\n

    public static void change(Test t)<\/span><\/p>\n

    {<\/span><\/p>\n

          t.x = 10; \/\/Changes reflects since we are not assigning t (refer first example)<\/span><\/p>\n

    }<\/span><\/p>\n

}<\/span><\/p>\n

\/\/Output: 10<\/span><\/strong><\/p>\n

2. Explain Different types of interfaces in the Collection framework<\/a><\/h3>\n

Note:<\/strong> The answer to this question is lengthy, Interviewer might ask few collections or all. To make it easier for you, we have given a short answer here with bullet points.<\/em><\/p>\n

\"\"<\/em><\/p>\n

(You do not have to draw this diagram in the interview, this is for your easy understanding)<\/em><\/p>\n

The Collection in Java<\/strong> is a framework that provides an architecture to store and manipulate a group of objects. Java collection makes easier perform operation like searching, sorting and manipulate data.<\/p>\n