CJ_Slip_10A

Slip No.10

A) Write a java program to count the frequency of each character in a given string.

1. Open Notepad.

2. Type the following code:

public class Main
{
public static void main(String[] args)
{
String str = "Hello Students";
int[] freq = new int[str.length()];
System.out.println("The entered string is "+str);
//Convert the given string into character array
char str1[] = str.toCharArray();
for(int i = 0; i {
freq[i] = 1;
for(int j = i+1; j {
if(str1[i] == str1[j])
{
freq[i]++;

//Set str1[j] to 0 to avoid printing visited character
str1[j] = '0';
}
}
}
//Displays the characters and their corresponding frequency
System.out.println("Frequencies of the characters in the string are as below: ");
System.out.println("Characters frequencies");
for(int i = 0; i {
if(str1[i] != ' ' && str1[i] != '0')
System.out.println(str1[i] + " " + freq[i]);
}
}
}

3. Save the file with the name Main.java. Make sure to select "All Files" in the "Save as type" dropdown and add the .java extension manually.

4. Open the Command Prompt.

5. Compile the Java program by typing:
javac Main.java

6. Run the compiled Java program by typing:
java Main