count the number of words in a string java

1 public static void main(String[] args)
2    { 
3        //return the number of words in a string 
4        
5       String example = "This is a good exercise"; 
6       
7       int length = example.split(" ").length;
8       
9       System.out.println("The string is " + length + " words long.");
10        
11        
12    }

1public class Frequency   
2{  
3     public static void main(String[] args) {  
4        String str = "picture perfect";  
5        int[] freq = new int[str.length()];  
6        int i, j;  
7          
8        //Converts given string into character array  
9        char string[] = str.toCharArray();  
10          
11        for(i = 0; i <str.length(); i++) {  
12            freq[i] = 1;  
13            for(j = i+1; j <str.length(); j++) {  
14                if(string[i] == string[j]) {  
15                    freq[i]++;             
16                    //Set string[j] to 0 to avoid printing visited character  
17                    string[j] = '0';  
18                }  
19            }  
20        }  
21        //Displays the each character and their corresponding frequency  
22        System.out.println("Characters and their corresponding frequencies");  
23        for(i = 0; i <freq.length; i++) {  
24            if(string[i] != ' ' && string[i] != '0')  
25                System.out.println(string[i] + "-" + freq[i]);  
26        }  
27    }  
28}  

1 String name = "Carmen is a fantastic play"; //arbitrary sentence
2        
3        int numWords = (name.split("\\s+")).length; //split string based on whitespace
4                                                //split returns array - find legth of array
5        
6        System.out.println(numWords);

1  String str = "I am happy and why not
2  and why are you not happy and you should be";
3        String [] arr = str.split(" ");
4        Map<String, Integer> map = new HashMap<>();
5
6        for (int i=0 ; i < arr.length ; i++){
7                if (!map.containsKey(arr[i])){
8                    map.put(arr[i],1);
9                } else{
10                    map.put(arr[i],map.get(arr[i])+1);
11                }
12        }
13        for(Map.Entry<String, Integer> each : map.entrySet()){
14
15  System.out.println(each.getKey()+" occures " + each.getValue() + " times");
16        }