How to Add elements to hash map and Display?

Posted by: Instanceofjava Posted date: 6:54 PM / comment : 0


  1. package com.instaceofjava; 
  2.  
  3. import java.util.HashMap;
  4. import java.util.Iterator;
  5. import java.util.Map;
  6. import java.util.Map.Entry;
  7.  
  8. public class Mapiterator {
  9.  
  10. public static void main(String[] args) {
  11.  
  12. HashMap map=new HashMap();
  13.  
  14. map.put(1, "indhu");
  15. map.put("d", "sindhu");
  16. map.put("3", "swathi");
  17.  
  18. if(!map.isEmpty()){
  19.  
  20. Iterator it=map.entrySet().iterator();
  21.  
  22. while(it.hasNext()){
  23.  
  24. Map.Entry obj=(Entry) it.next();
  25. System.out.println(obj.getValue());
  26.  
  27. }
  28.  
  29. }
  30.  
  31. }
  32.  
  33. }


Output:

  1. swathi 
  2. indhu
  3. sindhu

Count the number of occurrences of a character in a String?

Posted by: Instanceofjava Posted date: 6:52 PM / comment : 0

  1. package com.instaceofjava; 
  2.  
  3. public class StringCount {
  4.  
  5. public static void main(String[] args)
  6. {
  7.  
  8. String str = "abcdcabcdacbdadbca";
  9.  
  10.     String findStr = "b";
  11.     int lastIndex = 0;
  12.     int count = 0;
  13.  
  14.     while (lastIndex != -1) {
  15.  
  16.     lastIndex = str.indexOf(findStr, lastIndex);
  17.  
  18.     if (lastIndex != -1) {
  19.     count++;
  20.     lastIndex += findStr.length();
  21.  
  22.     }
  23.     }
  24.     System.out.println(count);
  25. }
  26.  
  27. }


Output:
  1. 4

Sorting string without using string Methods?

Posted by: Instanceofjava Posted date: 6:46 PM / comment : 0


  1. package com.Instanceofjava; 
  2. public class SortString {
  3.  
  4. public static void main(String[] args) {
  5.  
  6. String original = "edcba";
  7. int j=0;
  8. char temp=0;
  9.  
  10.   char[] chars = original.toCharArray();
  11.  
  12.   for (int i = 0; i <chars.length; i++) {
  13.  
  14.       for ( j = 0; j < chars.length; j++) {
  15.  
  16.        if(chars[j]>chars[i]){
  17.             temp=chars[i];
  18.            chars[i]=chars[j];
  19.            chars[j]=temp;
  20.        }
  21.  
  22.    }  
  23.  
  24. }
  25.  
  26. for(int k=0;k<chars.length;k++){
  27. System.out.println(chars[k]);
  28. }
  29.  
  30. }
  31.  
  32. }





Output:
  1. abcde


Sort the string using String Methods?

Posted by: Instanceofjava Posted date: 6:44 PM / comment : 0

  1. package com.instanceofjava; 
  2.  
  3. public class SortString {
  4.  
  5. public static void main(String[] args) { 
  6.  
  7.   String original = "edcba";
  8.  
  9.   char[] chars = original.toCharArray();
  10.  
  11.   Arrays.sort(chars);
  12.  
  13.   String sorted = new String(chars);
  14.   System.out.println(sorted);
  15. } 

  17. }





OutPut:
  1. abcde



Fibonacci series using recursion in java

Posted by: Instanceofjava Posted date: 6:40 PM / comment : 0

  1. package com.instaceofjavaforus;
      public class FibanacciRecursive {
    public void fibanci(int n1,int n2){
    int sum=0;
    if(n1==0){
    System.out.println(n1+"\n"+n2);
    }
    sum=n1+n2;
    if(sum<=100){
    System.out.println(sum);
    n1=n2;
    n2=sum;

    fibanci(n1,n2);

    }
    }

    public static void main(String[] args) {

          FibanacciRecursive fb=new FibanacciRecursive();
          fb.fibanci(0,1);
    }

    }
    Output:
    0
    1
    1
    2
    3
    5
    8
    13
    21
    34
    55
    89

Fibonacci series without using recursion in java

Posted by: Instanceofjava Posted date: 6:34 PM / comment : 0

  1. package com.instaceofjava;

    public class Fibanaciwithoutrecursive {

    public static void main(String[] args) {

    int n1=0;

    int n2=1;

    System.out.println(n1);

    System.out.println(n2);

    for(int i=0;i<=100;i++){

    int sum=n1+n2;

    if(sum<=100){

    n1=n2;

    n2=sum;

    System.out.println(sum);

    }
    }
    }




  1. Output:
    0
    1
    1
    2
    3
    5
    8
    13
    21
    34
    55
    89






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