String Methods in Java

String Methods in Java?

public class StringDemo {

    public static void main(String args[]){
        
        String str="welcome";

        System.out.println("Original String="+str);

        length() method: Return number of characters in a string
        System.out.println("Length of a string="+str.length());

        toUpperCase() method: Converts string into Uppercase
        System.out.println("String in uppercase="+str.toUpperCase());

        toLowerCase() method: Converts string into Lowercase
        System.out.println("String in lowercase="+str.toLowerCase());

        replace() method: It will replace specified character(s) in a string

        replace method have 2 arguments:

        First Argument - Specific character(s) you want to replace

        Second Argument - Replaces with our specified character

        System.out.println("String Replace="+str.replace("l","Z"));

        replaceAll() method: Replaces all characters in string
        replaceAll() method have 2 arguments:
        First Argument - Specific character(s) you want to replace
        Second Argument - Replaces all characters in string with our specified character
System.out.println("String ReplaceAll="+str.replaceAll("e","F"));
        System.out.println("String concat="+str.concat("to Java"));

        String str1=" world ";
        System.out.println("String contains="+str.contains(str1));
        System.out.println("String ReplaceFirst="+str.replaceFirst("l","Z"));
        System.out.println("String Trim="+str1.trim());
        System.out.println("String equals method="+str.equals(str1));
        System.out.println("String equalsIgnoreCase="+str.equalsIgnoreCase(str1));
        System.out.println("String contentEquals="+str.contentEquals(str1));
        System.out.println("String Starts With="+str.startsWith("w"));
        System.out.println("String Ends With="+str.endsWith("e"));
        System.out.println("String substring with begin index="+str.substring(1));
        System.out.println("String substring with begin and end index="+str.substring(1,3));
        System.out.println("String indexOf="+str.indexOf(2));
        System.out.println("String indexOf with String ="+str.indexOf("l"));
        System.out.println("String indexOf from character="+str.indexOf("e",1));
        System.out.println("String lastindexOf with string="+str.lastIndexOf("e"));
        System.out.println("String lastindexOf="+str.lastIndexOf(4));
        System.out.println("String lastindexOf from character="+str.lastIndexOf("c",6));
        System.out.println("String isEmpty="+str.isEmpty());
//        System.out.println("String compareTo="+str.compareTo(str1));//        System.out.println("String compareToIgnoreCase="+str.compareToIgnoreCase(str1));        System.out.println("String toCharArray="+str.toCharArray());

        String exp="one two three";
        System.out.println("String split ="+exp.split(" "));



        for(int i=0;i<str.length();i++){
            System.out.print(str.charAt(i)+" ");
        }

        System.out.println("\nAgain String="+str);
    }