public class MyClass { public static void main(String args[]) { //charAt() // returns the character at specified index String a = "codeyoung"; System.out.println(a.charAt(3)); //co... public class MyClass { public static void main(String args[]) { //charAt() // returns the character at specified index String a = "codeyoung"; System.out.println(a.charAt(3)); //concat() // combines two string together. String b = "coding"; System.out.println(a.concat(b)); //contains() // checks whether a string contains a sequence of character System.out.println(a.contains("yo")); //true //contentEquals() //checks whether a string contains the exact same sequence of characters of the specified charcter sequence System.out.println(b.contentEquals("cod")); System.out.println(b.contentEquals("coding")); //copyValueOf() // returns a string that represents the character of the character array. char[] c = {'P' , 'E' , 'O' , 'P' , 'L' , 'E'}; String d = " "; String r = " "; d = d.copyValueOf(c,1,5); // EOPLE r = r.copyValueOf(c); //PEOPLE System.out.println(d); System.out.println(r); //endsWith() //checks whenther a string ends with a specified charcter or not System.out.println(b.endsWith("ing")); //equals() // it compares two string and case affects the comparsion System.out.println("Java".equals("java")); //false System.out.println("java".equals("java")); //true System.out.println(a.equals(b)); //equalsIngnoreCase() // it comapares two string by ingorning the case System.out.println("Java".equalsIgnoreCase("java")); //true System.out.println("java".equalsIgnoreCase("java")); //true System.out.println(a.equalsIgnoreCase(b)); //getChar() //copies charcters from a string to an array of chars char myarr[] = {'A', 'P', 'P' , 'L' , 'E'}; String g = "hello world"; g.getChars(1,4,myarr,1); System.out.println(myarr); // AellE String ty = "codeyoung"; //indexOf() // returns the position of the first found occurence of specified character in a string System.out.println(ty.indexOf('o')); //lastIndexOf() //returns the position of the last found occurence of specified character in a string System.out.println(ty.lastIndexOf('o')); //isEmpty() //checks whether a string is empty or not System.out.println(ty.isEmpty()); // false //join() //joins one or more string with a specified separator String fruits = String.join("orange","mango","banana"); System.out.println(fruits); //length() //returns the length of a specified string System.out.println(ty.length()); //9 //regionMatches() String str1 = "hello world "; String str2 = "new world"; System.out.println(str1.regionMatches(5,str2,4,5)); //true //replace() //searches a string for a specified value and returns a new string where the specified values are replaced System.out.println(str1.replace('l','p')); //startsWith() / endsWith() //checks whether a string starts with a specified characters. System.out.println(str2.startsWith("ne")); //subString() //returns a new string which is a substring of a specified string String str3 = "hello world"; System.out.println(str3.substring(2,7)); //toCharArray() //converts a string to a new charcter array String str4 = "hello"; char[] myarray = str4.toCharArray(); System.out.println(myarray); //toLowerCase() / toUpperCase() String str5 = "HELLO"; System.out.println(str5.toLowerCase()); } } Read more