find frequency of characters in a string using java8 code example
Example 1: java count frequency of characters in a string
public class Frequency
{
public static void main(String[] args) {
String str = "picture perfect";
int[] freq = new int[str.length()];
int i, j;
char string[] = str.toCharArray();
for(i = 0; i <str.length(); i++) {
freq[i] = 1;
for(j = i+1; j <str.length(); j++) {
if(string[i] == string[j]) {
freq[i]++;
string[j] = '0';
}
}
}
System.out.println("Characters and their corresponding frequencies");
for(i = 0; i <freq.length; i++) {
if(string[i] != ' ' && string[i] != '0')
System.out.println(string[i] + "-" + freq[i]);
}
}
}
Example 2: string frequency of characters in java
String str = "AAAABBCCDD";
String result1 = "";
String nonDup = "";
for(int i=0; i < str.length(); i++)
if(!nonDup.contains(""+str.charAt(i)))
nonDup+= ""+str.charAt(i);
for( int j=0;j < nonDup.length(); j++) {
int count = 0;
for(int i=0; i < str.length(); i++) {
if(str.charAt(i) == nonDup.charAt(j))
count++;
}
result1 +=nonDup.charAt(j)+"" + count;
}
System.out.println(result1);