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Q971. Write a Program to print 3 largest words in a String

Ans. public class BuggyBread {
public static void main(String args[]) {
Map<String,Integer> wordLength = new HashMap();

String str = "We are what we repeatedly do; excellence, then, is not an act but a habit";

str = str.replaceAll(",","");
str = str.replaceAll(";","");
str = str.toLowerCase();

for(String word: str.split(" ")){
wordLength.put(word, word.length());
}

List<Map.Entry<String, Integer>> list = new LinkedList<Map.Entry<String, Integer>>( wordLength.entrySet() );

Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
{
public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
{
return (o1.getValue()).compareTo( o2.getValue() ) * -1;
}
} );

int countWords = 1;

for(Map.Entry<String, Integer> entry:list){
if(countWords <= 3){
System.out.println(entry.getKey());
}

countWords++;

}
}
}

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Q972. Write a Program to Sort entries of a map by its value

Ans. public class BuggyBread {
   public static void main(String args[]) {
      Map<String,Integer> wordLength = new HashMap();

      String str = "We are what we repeatedly do; excellence, then, is not an act but a habit";

      for(String word: str.split(" ")){
            wordLength.put(word, word.length());
      }

      List<Map.Entry<String, Integer>> list = new LinkedList<Map.Entry<String, Integer>>( wordLength.entrySet() );

      Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
{
public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
{
return (o1.getValue()).compareTo( o2.getValue() ) * -1;
}
} );

      System.out.println(list);

   }
}

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Q973. Write a Program to remove all spaces in a String

Ans. public class BuggyBread {
   public static void main(String args[]) {

      String str = "We are what we repeatedly do; excellence, then, is not an act but a habit";

      System.out.println(str.replaceAll(" ", ""));
   }
}

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Q974. Write a Program to remove multiple spaces

For example

We are what we repeatedly do; excellence, then, is not an act but a habit

should result in

We are what we repeatedly do; excellence, then, is not an act but a habit

Ans. public class BuggyBread {
   public static void main(String args[]) {
      String str = "We are what we repeatedly do; excellence, then, is not an act but a habit";

      String[] splittedString = str.split(" ");

      for(String word: splittedString){
         word = word.trim();
         if(!word.equals("")){
            System.out.print(word.trim());
            System.out.print(" ");
         }
      }


   }
}

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Q975. What are the ways to Reuse Code in Java ?

Ans. 1. Object Level Reuse - private methods
2. Class Level Reuse - static methods
3. package level Reuse - default methods
4. Application Level Reuse - Classes
5. Multiple Applications Level Reuse - Libraries , Frameworks

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Q976. What are the different primitive data types in Java ?

Ans. boolean
byte
char
double
float
int
long
short
void

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Q977. What are the different operators in Java ?

Ans. && - AND
|| - OR
! - LOGICAL NOT

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Q978. Write a Program to check if a number is perfect or not

Ans. public class BuggyBread {
   public static void main(String args[]) {
       int number = 7;
       boolean perfectNumber = true;
       for(int x=2;x<number;x++){
          if(number % x == 0){
             perfectNumber = false;
          }
       }

       if(perfectNumber){
          System.out.println("Perfect Number");
       } else {
          System.out.println("Not a Perfect Number");
       }
   }
}

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Q979. Write a Program to print all perfect numbers from 1 to 100

Ans. public class BuggyBread {
   public static void main(String args[]) {
      for(int number=1;number < 100;number++){
          boolean perfectNumber = true;
          for(int x=2;x<number;x++){
             if(number % x == 0){
                perfectNumber = false;
             }
          }

          if(perfectNumber){
             System.out.println(number);
          }
       }
   }
}

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Q980. What is a method reference in Java ?

Ans. Introduced with java 8 , Method References help us to point to methods by their name.

A method references is described using :: symbol

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Q981. Write a Program to print index of first capital character in a string.

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly do excellence, then, is not an Act but a habit";
       int count = 1;
       for(Character c: str.toCharArray()){
          if(Character.isUpperCase(c)){
             break;
          } else {
             count++;
          }
       }

       System.out.println(count);
   }
}

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Q982. Write a Program to count number of capital characters in a String

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "We are what we repeatedly do excellence, then, is not an Act but a habit";
       int count = 0;
       for(Character c: str.toCharArray()){
          if(Character.isUpperCase(c)){
             count++;
          }
       }

       System.out.println(count);
   }
}

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Q983. Write a Program to count number of lower case characters in a String

Ans. public class BuggyBread1 {
   public static void main(String args[]) {
       String str = "We are what we repeatedly do excellence, then, is not an Act but a habit";
       int count = 0;
       for(Character c: str.toCharArray()){
          if(Character.isLowerCase(c)){
             count++;
          }
       }

       System.out.println(count);
   }
}

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Q984. Write a Program to print first word with a capital character in a String

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly do excellence, then, is not an act but a haBit";
       String wordWithCaptalChar = "";

       for(String word:str.split(" ")){
          if(!word.equals(word.toLowerCase())){
             wordWithCaptalChar = word;
          }
       }

       System.out.println(wordWithCaptalChar);
   }
}

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Q985. Write a Program to print the word in a String starting with a capital character

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       String wordWithFirstCaptalChar = "";

       for(String word:str.split(" ")){
          if(Character.isUpperCase(word.charAt(0))){
             wordWithFirstCaptalChar = word;
          }
       }

       System.out.println(wordWithFirstCaptalChar);
   }
}

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Q986. Write a Program to count number of words in a String

Ans. public class BuggyBread1 {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";

       System.out.println(str.split(" ").length);
   }
}

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Q987. Write a Program to print duplicate words in a String

Ans. public class BuggyBread {
public static void main(String args[]) {
String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
Set<String> words = new HashSet();
for(String word:str.split(" ")){
if(words.contains(word)){
System.out.println(word);
} else {
words.add(word);
}
}
}
}

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Q988. Write a Program to print words of a String starting with character w

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       for(String word:str.split(" ")){
          if(word.startsWith("w")){
             System.out.println(word);
          }
       }
   }
}

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Q989. Write a Program to print words of a String containing the specified String.

For example - Print all words having characters ha

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       for(String word:str.split(" ")){
          if(word.contains("ha")){
             System.out.println(word);
          }
       }
   }
}

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Q990. Write a Program to print words in a string having length greater than 2 and third characters being p

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       for(String word:str.split(" ")){
          if(word.length() > 2 && word.charAt(2) == 'p'){
             System.out.println(word);
          }
       }
   }
}

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Q991. Write a Program to print words of a String having length greater than 2 and ending with it

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       for(String word:str.split(" ")){
          if(word.length() > 2 && word.endsWith("it")){
             System.out.println(word);
          }
       }
   }
}

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Q992. Write code to find second largest number in an array of integers.

Ans. int arr[]={1,3,5,6,4,8,9,2,10};
Arrays.sort();
System.out.println(arr[arr.length-1]);

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Q993. Write a Program to find common words in 2 separate strings

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str1 = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       String str2 = "we are what we repeatedly Do is";
       String[] str1Words = str1.split(" ");
       String[] str2Words = str2.split(" ");

       Set str1WordsSet = new HashSet();

       for(String word:str1Words){
          str1WordsSet.add(word);
       }

       for(String word:str2Words){
          if(str1WordsSet.contains(word)){
             System.out.println(word);
          }
       }

   }
}

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Q994. Write a program to print count / no of common words in 2 separate strings

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str1 = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
       String str2 = "we are what we repeatedly Do is";
       String[] str1Words = str1.split(" ");
       String[] str2Words = str2.split(" ");

       Set str1WordsSet = new HashSet();

       for(String word:str1Words){
          str1WordsSet.add(word);
       }

       int commonWordsCount = 0;

       for(String word:str2Words){
          if(str1WordsSet.contains(word)){
             commonWordsCount++;
          }
       }

       System.out.println(commonWordsCount);
   }
}

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Q995. Write a Program to remove duplicate words from the String

Ans.
public class BuggyBread {
public static void main(String args[]) {
String str = "we are what we repeatedly Do excellence, then, is not an act but a haBit";
Set<String> wordSet = new LinkedHashSet(); // Using Linked Hash Set as we would like to retrieve words in the insertion order

for(String word: str.split(" ")){
wordSet.add(word);
}

for(String word: wordSet){
System.out.print(word);
System.out.print(" ");
}
}
}

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Q996. Write a Program to display the words of a String in alpahbetical or Dictionary Order

Ans. public class BuggyBread {
   public static void main(String args[]) {
       String str = "we are what we repeatedly do excellence then is not an act but a haBit";
       Set<String> wordSet = new TreeSet(); // Using Linked Hash Set as we would like to retrieve words in the insertion order

       for(String word: str.split(" ")){
          wordSet.add(word);
       }

       for(String word: wordSet){
          System.out.print(word);
          System.out.print(" ");
       }
   }
}

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Q997. Write a program to print sum of numbers between the start and end number

For example - Passing start number as 2 and end number as 10, it should print 2+3+4+5+6+7+8+9+10 = 54

Ans.
public class BuggyBread {
   public static void main(String args[]) {
       System.out.println(sum(2,10));
   }

   private static int sum(int start,int end){
      if(start > end){
         return 0;
      } else {
         return start + sum(start+1,end);
      }
   }
}

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Q998. Write a program using Recursion to print multiplication of numbers between the start and end number

For example - Passing start number as 2 and end number as 10, it should print 2*3*4*5*6*7*8*9*10 = 3628800

Ans.
public class BuggyBread {
   public static void main(String args[]) {
       System.out.println(multiply(2,5));
   }

   private static int multiply(int start,int end){
      if(start > end){
         return 1;
      } else {
         return start * multiply(start+1,end);
      }
   }
}

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Q999. Write a Program to display numbers between 2 numbers using recursion

Ans. public class BuggyBread {
   public static void main(String args[]) {
       displayNumbersBetween(2,10);
   }

   private static void displayNumbersBetween(int start,int end){
      if(start > end){
         return ;
      } else {
         System.out.println(start);
         displayNumbersBetween(start+1,end);
      }
   }
}

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Q1000. Write a Program to print asterix like following using Recursion

**
***
****
*****
******
*******
********
*********
**********

Program should set the start and end index and then display this accordingly. For example the above pattern is for displayNumbersBetween(2,10) and following is for displayNumbersBetween(5,7)

*****
******
*******

Ans. public class BuggyBread {
   public static void main(String args[]) {
       displayNumbersBetween(5,7);
   }

   private static void displayNumbersBetween(int start,int end){
      if(start > end){
         return ;
      } else {
         for(int x=1;x<=start;x++){
            System.out.print("*");
         }
         System.out.println("");
         displayNumbersBetween(start+1,end);
      }
   }
}

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