Java interview programming questions on this keyword part 2

java programming interview questions

Java interview programming questions on this keyword part 2

Kris Kimcil 10.28 Komentar

• Hi friends this is the part 2 of this keyword programming interview questions
• Check this for part 1 Java programming examples programs on this keyword part 1

Java Quiz on this keyword part #2

• Java interview program on this keyword: can we call method using this keyword?

  
Program  #5:

1. Show() method called
2. 1
3. 2

Program #6: Can we call non static method from constructor using this?

1. B class Constructor
2. method

Program #7: Can we assign something to this ?

1. package thiskeywordinterviewprograms.java;
2. public class ThisDemo {
3.  
4.     int a;
5.     int b;
6.     
7.  ThisDemo(int x, int y){
8.  
9.        this= new ThisDemo();
10.         System.out.println("Two argument constructor called.");
11.         this.x=x;
12.         this.y=y;
13.         
14. }
15.  
16. public static void main(String[] args) {
17.         
18.     ThisDemo obj = new ThisDemo(10, 20);
19.         
20.      System.out.println(obj.a);
21.      System.out.println(obj.b);
22. 
    
23. }
24.  
25. }

1. Compile Time Error at line number 9: left hand side of assignment must be a variable
2. We can not modify or assign something to this it leads to compile time error

Program #8 : Can we use this as return statement in a method?

1. public class B{
2. 
   
3.    int a;
4.     
5.  public int getA() {
6.         return a;
7.  }
8.  
9. public void setA(int a) {
10.         this.a = a;
11. }
12.  
13. B show(){
14.     return this;
15. }
16.  
17. public static void main(String[] args) {
18.        
19.  B obj = new B();
20.  
21.   obj.setA(10);
22.  
23.  System.out.println(obj.getA());
24.  B obj2= obj.show();
25.  System.out.println(obj2.getA());
26.  
27. }
28. 
    
29. }

1. 10
2. 10

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Java Interview programming questions on this keyword

java programming interview questions

Java Interview programming questions on this keyword

Kris Kimcil 09.18 Komentar

• Lets discuss some interesting programs on this keyword.
• Now its time to practice some programs on this keyword. 
• Try to guess the output of the following java programming questions on this keyword.
• If you want explanations for all the programs please go through this keyword interview questions on java

Java Quiz on this keyword part #1

Program #1: Java interview programming question on this keyword.

1. package thiskeywordinterviewprograms.java;
2. public class ThisDemo {
3.  
4.     int a;
5.     int b;
6.     
7. ThisDemo(int a, int b){
8.  
9.     a=a;
10.     b=b;
11.         
12. }
13.  
14. public static void main(String[] args) {
15.         
16.     ThisDemo obj = new ThisDemo(10, 20);
17.         
18.      System.out.println(obj.a);
19.      System.out.println(obj.b);
20. 
    
21. }
22.  
23. }

1. 0
2. 0

Program #2: Java interview programming question on this keyword.

1. package thiskeywordinterviewprograms.java;
2. public class ThisDemo {
3.  
4.     int a;
5.     int b;
6.     
7. ThisDemo(int a, int b){
8.  
9.     this.a=a;
10.     this.b=b;
11.         
12. }
13.  
14. public static void main(String[] args) {
15.         
16.     ThisDemo obj = new ThisDemo(10, 20);
17.         
18.      System.out.println(obj.a);
19.      System.out.println(obj.b);
20. 
    
21. }
22.  
23. }

1. 10
2. 20

Program #3: Java Interview programming example on this keyword.

• What will be the output of the below program

1. package thiskeywordinterviewprograms.java;
2. public class ThisDemo {
3.  
4.     int a;
5.     int b;
6.     
7. ThisDemo(int a, int b){
8.  
9.     this.a=a;
10.     this.b=b;
11.         
12. }
13.  
14. public static void main(String[] args) {
15.         
16.     ThisDemo obj = new ThisDemo();
17.         
18.      System.out.println(obj.a);
19.      System.out.println(obj.b);
20. 
    
21. }
22.  
23. }

Program #4: Java interview programming question on this keyword.

1. Zero argument constructor called.
2. Two argument constructor called.
3. x=1
4. y=2

Interview Programming questions on this keyword part 2

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Java Program to find shortest palindrome in string

Basic Java Example programs java interview programs

Java Program to find shortest palindrome in string

Kris Kimcil 10.36 Komentar

• We have a Letter or a word then we need add some letters to it and need to find out shortest palindrome 
• For example we take "S":  S will be the shortest palindrome string.
• If we take "xyz":  zyxyz will be the shortest palindrome string
• So we need to add some characters to the given string or character and find out what will be the shortest palindrome string by using simple java program.

Java example Program to find out shortest palindrome of given string

1. package shortestpalindromeexample.java;
2. import java.util.Scanner;
3.  
4. public class ShortestPalindromeDemo {
5.  
6. public static String shortestPalindrome(String str) {
7.      
8. int x=0;  
9. int y=str.length()-1;
10.      
11.   while(y>=0){
12.      if(str.charAt(x)==str.charAt(y)){
13.           x++;
14.          }
15.             y--;
16.   }
17.  
18. if(x==str.length())
19. return str;
20.  
21. String suffix = str.substring(x);
22. String prefix = new StringBuilder(suffix).reverse().toString();
23. String mid = shortestPalindrome(str.substring(0, x));
24.  
25. return prefix+mid+suffix;
26. }
27.  
28. public static void main(String[] args) {
29.  
30. Scanner in = new Scanner(System.in);
31.  
32. System.out.println("Enter a String to find out shortest palindrome");
33.  
34. String str=in.nextLine();
36.  
37. System.out.println("Shortest palindrome of "+str+" is "+shortestPalindrome(str));
38.  
39. }
40.  
41. }
    

Output:

1. Enter a String to find out shortest palindrome
2. java
3. Shortest palindrome of java is avajava

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