Day_10_Method_Of_String.java

// Welcome to Day 10
// " Today, I tackled a problem involving a for Method of String. ”

/* Problem 1 : Write a code to show all method of string but in one program.
 */
/* Problem 2 : Write a program to difference between equals() and == in String.
 */
public class Day_10_Method_Of_String {
    public static void main(String[] args) {

        // Solving Problem 1
        // here we take three String
        /*String s1 = "refresh java";
        String s2 = "Hello World";
        String s3 = "learn java on refresh java tutorial";
        String str;

        // Getting the length of a string
        System.out.println("length of string s1 = "+s1.length());

        // Comparing two strings
        System.out.println(s1.equals("refresh java"));
        System.out.println("is s1 equals s2 = "+s1.equals(s2));

        // Checking if a string starts with a given substring
        System.out.println("is s1 starts with word refresh = "+s1.startsWith("refresh"));

        // Searching a substring in a string
        System.out.println("index of word java in s3 = "+s3.indexOf("java"));
        System.out.println("index of word hello in s3 = "+s3.indexOf("hello")); // here hello is not found by default print -1

        // Getting the character at given index in a string
        System.out.println("character at index 8 in string s1 = "+s1.charAt(8));

        // Extracting a substring from a given string
        str = s1.substring(8);
        System.out.println("Substring str = "+str);

        // After extracting a substring, value of s1 will still remain same.
        System.out.println("Value of s1 = "+s1);

        // Converting a given string to lower case.
        str = s2.toLowerCase();
        System.out.println("Lower case str = "+str);

        // Concatenating a string to given string.
        str = s1.concat(" tutorial");
        System.out.println("Concatenated str = "+str);

        // Concatenating a string to given string using + operator.
        str = str + " online";
        System.out.println("+ operated value of str = "+str);

        // Replacing a word in a given string.
        str = s3.replaceFirst("java","program");
        System.out.println("Replaced value str = "+str);

        // Splitting a given string using space( ).
        String[] strArray = s3.split(" ");
        for(String strVar : strArray) {
            System.out.print(strVar + ", ");
        }*/

        // Solving Problem 2
        String str1 = "refresh java";
        String str2 = new String("refresh java");
        String str3 = "refresh java";
        String str4 = new String("refresh java");
        String str5 = str2;

        System.out.println("Comparison using equals() method ..........");
        System.out.println("str equals() str2 >> "+str1.equals(str2));
        System.out.println("str equals() str5 >> "+str1.equals(str5));
        System.out.println("str2 equals() str4 >> "+str2.equals(str4));
        System.out.println("str2 equals() str5 >> "+str2.equals(str5));

        System.out.println("Comparison using == operator ..........");
        System.out.println("str == str2 >> "+(str1 == str2));
        System.out.println("str == str3 >> "+(str1 == str3));
        System.out.println("str2 == str4 >> "+(str2 == str4));
        System.out.println("str2 == str5 >> "+(str2 == str5));
        System.out.println("str4 == str5 >> "+(str4 == str5));
    }
}