package com.methods;
public class String_Functions {
public static void main(String[] args) {
String Str1="iam learning selenium";
String str2=" iam lazy to practise";
//equals function
System.out.println("comapring two styrings::"+Str1.equals(str2));
//concat function
System.out.println("Concatenation two strings:::"+Str1.concat(str2));
//charAt function
String st1="iam so beautifull";
System.out.println("index of charaAT:::"+st1.charAt(5));
//length function
System.out.println("lenght of st1::"+st1.length());
//toLowerCase function
String s="sELeNIuM";
System.out.println("LOWERCASE::"+s.toLowerCase());
//toUpperCase function
String s1="SEleIuM";
System.out.println("LOWERCASE::"+s1.toUpperCase());
//indexOf function
String t="iam very happy";
System.out.println("index of:::"+t.indexOf("very"));
//valueOf function
int j=100;
System.out.println("convert int to string::"+String.valueOf(j));
//parseInt function
String i="200";
System.out.println("convert string to int::"+Integer.parseInt(i));
//substring function
String st="i want job without practise";
System.out.println("substring is:::"+st.substring(11, 18));
//substring function
String p="RS/-300/-";
System.out.println("price substring is:::"+p.substring(4,7));
//split function
String splt="HCL@INFOSYS@DELOITE@IBM@GOOGLE@TECH";
String arrayvar[]=splt.split("@");
for(String each:arrayvar){
System.out.println("each index::"+each);
}
//split function
String sn="i want job in top mnc but i will not be regualr to class";
String var[]=sn.split(" ");
for(String eachindex:var){
System.out.println("index is::"+eachindex);
}
//trim function
String tr=" testing tools ";
System.out.println("trim vallue is::"+tr.trim());
}
}
Comparing
Strings:
In order to
compare Strings for equality, you should use the String object's equals or
equalsIgnoreCase
methods.
For example,
the following snippet will determine if the two instances of String are equal
on all
characters
String
firstString = "Test123";
String
secondString = "Test" + 123;
if
(firstString.equals(secondString)) {
// Both Strings have the same content.
}
This example
will compare them, independent of their case
import
java.util.*;
import
java.lang.*;
import
java.io.*;
class Ideone
{
public static void main (String[]
args) throws java.lang.Exception
{
String firstString =
"Test123";
String secondString =
"TEST123";
if
(firstString.equalsIgnoreCase(secondString)) {
System.out.print("Equal");
}
}
}
Comparing
Strings in switch statement
String
stringToSwitch = "A";
switch
(stringToSwitch) {
case "a":
System.out.println("a");
break;
case "A":
System.out.println("A");
//the code goes here
break;
case "B":
System.out.println("B");
break;
default:
break;
}
Changing the
case of characters within a String
The String
type provides two methods for converting strings between upper case and lower
case:
toUpperCase
to converts all characters to upper case
toLowerCase
to convert all characters to lower case
These
methods both return the converted strings as new String instances:
the original
String objects are not modified.
String
string = "This is a Random String";
String upper
= string.toUpperCase();
String lower
= string.toLowerCase();
System.out.println(string); // prints "This is a Random
String"
System.out.println(lower); // prints "this is a random
string"
System.out.println(upper); // prints "THIS IS A RANDOM
STRING"
Finding a
String Within Another String
To check
whether a particular String a is being contained in a String b or not, we can
use the method
String.contains() with the following syntax:
b.contains(a);
// Return true if a is contained in b, false otherwise
The
String.contains() method can be used to verify if a CharSequence can be found
in the String.
The method
looks for the String a in the String b in a case-sensitive way.
String str1
= "Hello World";
String str2
= "Hello";
String str3
= "helLO";
System.out.println(str1.contains(str2));
//prints true
System.out.println(str1.contains(str3));
//prints false
Reversing
Strings
There are a
couple ways you can reverse a string to make it backwards.
StringBuilder/StringBuffer:
String code
= "code";
System.out.println(code);
StringBuilder sb = new StringBuilder(code);
code = sb.reverse().toString();
Char array:
String code
= "code";
System.out.println(code);
char[] array
= code.toCharArray();
for (int
index = 0, mirroredIndex = array.length - 1; index < mirroredIndex; index++,
mirroredIndex--) {
char temp = array[index];
array[index] = array[mirroredIndex];
array[mirroredIndex] = temp;
}
// print
reversed
System.out.println(new
String(array));
System.out.println(code);
