Create stringMethods.java

String/stringMethods.java

+// Java code to illustrate different constructors and methods
+// String class.
+
+import java.io.*;
+import java.util.*;
+class Test
+{
+	public static void main (String[] args)
+	{
+		String s= "GeeksforGeeks";
+		// or String s= new String ("GeeksforGeeks");
+
+		// 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));
+
+		// Returns the substring from i to j-1 index.
+		System.out.println("Substring = " + s.substring(2,5));
+
+		// Concatenates string2 to the end of string1.
+		String s1 = "Geeks";
+		String s2 = "forGeeks";
+		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 = "Geeks".equals("geeks");
+		System.out.println("Checking Equality " + out);
+		out = "Geeks".equals("Geeks");
+		System.out.println("Checking Equality " + out);
+
+		out = "Geeks".equalsIgnoreCase("gEeks ");
+		System.out.println("Checking Equality " + out);
+		
+		//If ASCII difference is zero then the two strings are similar
+		int out1 = s1.compareTo(s2);
+		System.out.println("the difference between ASCII value is="+out1);
+		// Converting cases
+		String word1 = "GeeKyMe";
+		System.out.println("Changing to lower Case " +
+							word1.toLowerCase());
+
+		// Converting cases
+		String word2 = "GeekyME";
+		System.out.println("Changing to UPPER Case " +
+							word2.toUpperCase());
+
+		// Trimming the word
+		String word4 = " Learn Share Learn ";
+		System.out.println("Trim the word " + word4.trim());
+
+		// Replacing characters
+		String str1 = "feeksforfeeks";
+		System.out.println("Original String " + str1);
+		String str2 = "feeksforfeeks".replace('f' ,'g') ;
+		System.out.println("Replaced f with g -> " + str2);
+	}
+}
+
+// output:
+// String length = 13
+// Character at 3rd position = k
+// Substring ksforGeeks
+// Substring = eks
+// Concatenated string = GeeksforGeeks
+// Index of Share 6
+// Index of a = 8
+// Checking Equality false
+// Checking Equality true
+// Checking Equality false
+// the difference between ASCII value is=-31
+// Changing to lower Case geekyme
+// Changing to UPPER Case GEEKYME
+// Trim the word Learn Share Learn
+// Original String feeksforfeeks
+// Replaced f with g -> geeksgorgeeks