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February 21, 2022 07:27 am GMT

2. Basic String operations

Declaring string and assigning value to it

public class main{    public static void main(String[] args){        String str1 = " hello world";        System.out.println(str1);    }}

Concatination of strings

public class main{    public static void main(String[] args){        String str1 = " hello world";        String str2 = "India";        String str3 = str1+str2;        System.out.println(str3);    }}

Accessing element from its position

public class main{    public static void main(String[] args){        String str1 = " hello world";        //charAt(pos) is used to access element in string at pos position.        System.out.println(str1.charAt(2));    }}

Getting substring from string

public class main{    public static void main(String[] args){        String str1 = " hello world";        //substring get substring from a string by accepting starting and ending position.        System.out.println(str1.substring(2,4));    }}

Using split method

public class main{    public static void main(String[] args){        String str1 = "A,B,C,D";        String str2 = "H I J k";        //will split string by using , as identifier        String [] arr1 = str1.split(",");        // will split string by using space as identifier        String [] arr2 = str2.split(" ");    }}

String inbuilt methods

public class main{    public static void main(String[] args){        String str1 = " hello world";        // will return length of string        System.out.println(str1.length());        // will convert all char to uppercase        System.out.println(str1.toUpperCase());        //check if string starts with "h"        System.out.println(str1.startsWith("h"));        //check if string ends with "h"        System.out.println(str1.endsWith("h"));        //will find index of "ll"        System.out.println(str1.indexOf("ll"));        // will return index of last occurence if "hello"        System.out.println(str1.lastIndexOf("hello"));        //will replace hello with bye        System.out.println(str1.replace("hello", "bye"));        System.out.println(str1);        System.out.println(Integer.toBinaryString(a));        System.out.println(Integer.toHexString(a));        System.out.println(Integer.parseInt(Integer.toString(a)));    }}

Original Link: https://dev.to/souravsingpardeshi/2-basic-string-operations-56nj

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