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StringMethods.java

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package strings;

public class StringMethods {

public static void main(String[] args) {

String s = "Hello World";

// String s = new String("Hello World");

// Returns the number of characters in the string.

System.out.println("String length: " + s.length());

// Returns the character at ith index

System.out.println("Character at 3rd position: " + s.charAt(3));

// Return the substring from the ith index character to end of string

System.out.println("Substring: "+s.substring(3));

// Return the substring from i to j-1 index

System.out.println("Substring: "+ s.substring(2, 5));

// Concatenates string2 to end of string1

String s1 = "Hello";

String s2 = " World";

System.out.println("Concatenated String: "+ s1.concat(s2));

// Returns the index within the string of the first occurrence of the specified string

String s4 = "Learn Share Learn";

System.out.println("Index of Share " + s4.indexOf("Share"));

// Returns the index within the string of the first occurrence of the specified string

// Starting at the specified index

System.out.println("Index of a: " + s4.indexOf('a', 3));

// Checking equality of Strings

Boolean out = "Hello".equals("Worlds");

System.out.println("Checking Equality: " + out);

out = "Hello".equals("Hello");

System.out.println("Checking Equality: " + out);

out = "Hello".equalsIgnoreCase("hEllo");

System.out.println("Checing Equality: " + out);

int out1 = s1.compareTo(s2);

System.out.println("If s1 = s2 : " + out);

// Converting cases

String word1 = "Hello World" ;

System.out.println("Changing to lower Case: " + word1.toLowerCase());

// Converting cases

String word2 = "Hello World";

System.out.println("Changing to Upper case: " + word2.toUpperCase());

// Trimming the word

String word3 = " Learn Share Learn ";

System.out.println("Trim the word: "+word3.trim());

// Replacing Characters

String str1 = "Hello ";

System.out.println("Orginal String: "+ str1);

String str2 = str1.replace(" ", " World");

System.out.println("Replaced String: " + str2);

}