public class StringMethods {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String str = "John, Jennie, Jim, Jack, Joe";
		int len = str.length();
		System.out.println("Length of str is: " +len);
		System.out.println(str.charAt(0) + "|" + str.charAt(len-1));
		
		
		String s1 = str.toUpperCase();
		System.out.println("str after upper case is: " + str); //no changes, strings are immutable
		System.out.println("s1 is: "+s1); //new string will created, old string will not be changed.
		
		if (str.contains("Jim")) {
			System.out.println("Jim is in the string");
		}
		
		String s2 = str.substring(5);
		System.out.println("s2 is: "+s2);
		
		String s3 = str.substring(6, 10); //start with 6th index till 9 index i.e. less than 10
		System.out.println("s3 is: " +s3);
		
		String s4 = str.replace('J', 'K');
		System.out.println("s4 is: " +s4);
		
		char[] chArr = str.toCharArray();
		for(char ch:chArr) {
			System.out.println(ch + " ");
		}
		System.out.println();
		
		String[] strArr = str.split(",");
		for (String s:strArr) {
			System.out.println(s.trim());
		}
		//trim:
		String s = "   Hello World  ";
		System.out.println(s.trim());
		
		System.out.println(s.replace(" ", ""));
		
		String date = "01-22-2019"; //01/22/2019
		System.out.println(date.replace("-", "/"));
		
		//split:
		String test = "Hello_world_test_selenium";
		String[] testval = test.split("_");
		for(String strtest:testval)
		{
			System.out.println(strtest);
		}
				
	}

}