Java String equals Example

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String class equals method example String class equals method example:- This method demonstrates the working of equals() method. it returns boolean values true and false after examining the two objects taken under checking process Syntax:-equals(Object anObject) Here is the code:- /** * @(#) EqualsString.java * EqualsStringString class demonstrates the working of equals() method of String class of lang package */ public class EqualsString { public static void main(String args[]) { Integer in = new Integer(12234); String str = new String("12234"); // since both objects posses same value but the type of value is // different. Here there are two types of objects compared one is // Integer type and the other one is String type so the method returns // false as values types didnot match System.out.println( "value types don't matches: " + in.equals(str)); // method returns true if and only if none of the Strings compared // posses null value and also must that there value matches each other // in sequence, cases and all aspects of equality including value types String str1 = new String(" hare krishna hare rama! rama rama hare hare"); String str2 = str1.substring(0); String str3 = " ", str4 = " "; String str5 = "heram", str6 = "Heram"; //Method returns true here as both Strings str1 and str2 posses same values System.out.println(" 'true' is returned: " + str1.equals(str2)); //Both the String mentioned above don't have any value but still Strings are equal as both are null type objects compared" System.out.println("Method returns true here: " + str3.equals(str4)); //Method here returns false because values of Strings did not match when their respective letters case are concerned System.out.println(" 'false' is returned: " + str5.equals(str6)); } } Output of the program:- -------------------------------- value types don't matches: false 'true' is returned: true Method returns true here: true 'false' is returned: false

Java String format(String format)Example

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String class format(String format) method example String class format(String format) method example. This example shows you how to use format(String format) method.This method Returns a formatted string using the specified format string and arguments. Here is the code:- /* * @(#) Formatstring1.java *Program Returns a formatted string using the specified format string and arguments. */ import java.util.*; public class Formatstring1 { public static void main(String[] args) { long n = 461012; //Returns a formatted string using the specified format string and arguments. System.out.format("%d%n", n); System.out.format("%08d%n", n); } }

Java String substring Example

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String class substring method example String class substring method example:- This example demonstrates the working of substring method example. this method returns a substring of a String , here substring is a new string in which value from certain index passed has been copied and pasted of String under method process Syntax:- substring(int beginIndex) Here is the code:- /** * @(#) SubstringString.java * SubstringString class demonstrates the working of substring() method of String class of lang package */ public class SubstringString { public static void main(String args[]) { String str = "as per einstein conclusion nothing can travel faster than light", str1 = " ", str2 = "he ram"; str1 = str.substring(0); // method substring takes the complete data from specified index // location of the string under taken in to the String in which the // method is invoked // complete value of string str has been copied as zero(0) index // location has been passed inside method parentheses System.out.println("value of String str1 taken by the method : " + str1); System.out.println("value String str2 taken by the method: " + str2.substring(3)); } } Output of the program:- value of String str1 taken by the method : as per einstein conclusion nothing can travel faster than light value String str2 taken by the method: ram

Java String matches Example

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String class matches method example String class matches method example:- This example demonstrates the working of matches() method. this method returns boolean values if it gets same match of object value to the passes argument value in the parentheses. Syntax:-matches(String regex) Here is the code:- /** * @(#) MatchesString.java * MatchesString class demonstrates the working of matches() method of String class of lang package * */ public class MatchesString { public static void main(String args[]) { // method just matches the String value to the specified value in the // parentheses and generates boolean values String str = " heram", str1 = "xaaaaa"; boolean result = str1.matches("aaaaa"); // method not get the same values therefore it returns false System.out.println("Method returns 'false': " + result); // method gets the same values but not able to match there allignments // therefore it returns false result = str.matches("heram"); System.out.println("Method returns 'false': " + result); // method gets the same values with precise allignments therefore it // returns true result = str.matches(" heram"); System.out.println("Method returns 'true': " + result); } } Output of the program:- ------------------------------ Method returns 'false': false Method returns 'false': false Method returns 'true': true

String Array Example

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String Array example. This example shows you how to initialize String Array This example shows you how to initialize String Array. Here is the code /** * @ # StringArray.java * A class repersenting how initialization String Arrays * */ public class StringArray { public static void main(String args[]) { //initialization String Arrays String arr[] = {"Zero", "One", "Three"}; System.out.println("String Array arr ..."); for (int i = 0; i < arr.length; i++) { System.out.println(arr[i]); } String arr1[] = new String[]{"Zero", "One", "Two"}; System.out.println("\nString Array arr1..."); for (int i = 0; i < arr1.length; i++) { System.out.println(arr1[i]); } // This allocates the array but they are all null String arr2[] = new String[3]; // here you start to stuff in the values. arr2[0] = "Zero"; arr2[1] = "One"; arr2[2] = "Two"; System.out.println("\nString Array arr2..."); for (int i = 0; i < arr2.length; i++) { System.out.println(arr2[i]); } } } Output : -------------------- String Array arr ... Zero One Three String Array arr1... Zero One Two String Array arr2... Zero One Two

Java String contains Example

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String class Contains method example String class Contains method example:- This example demonstrates the working of contains() method. this method generates boolean value true if and only if it finds the same sequence of data in the called String. Syntax:-contains(CharSequence s) Here is the code:- /** * @(#) ContainsString.java * ContainsString class demonstrates the working of contains() method of String class of lang package * */ public class ContainsString { public static void main(String args[]) { // contains() method checks the sequence characters and // number or both characters and numbers together passed in parentheses // into the called String String str = "om namah shivaya", str1 = "420_9211", str2, str3; CharSequence char0 = "am", char1 = "_"; boolean result = str.contains(char0); // Method ables to find the sequence of characters(am) therefore it // generates boolean type true System.out.println("Method returns true here: " + "'" + result + "'"); result = str1.contains(char1); System.out.println(); // Method ables to fing the symbol underscore(_) therefore it generates // boolean type true" System.out.println("'true' is returned: " + "'" + result + "'"); System.out.println(); str2 = " hare ram1 hare ram, hare krishna hare ram "; System.out.println("'false' is returned: " + "'" + str2.contains("krishna ram1") + "'"); } } Output of the program:- ---------------------------------- Method returns true here: 'true' 'true' is returned: 'true' 'false' is returned: 'false'

Java String indexOf Example

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Java String indexOf Example String class indexOf method example String class indexOf method example:- This example demonstrates the working of indexOf method. this method returns the index location of character specified. Syntax:-indexOf('h') Here is the code:- /** * @(#) IndexOfString.java * IndexOfString class demonstrates the working of indexOf() method of String class of lang package * */ public class IndexOfString { public static void main(String args[]){ // Method here returns index location or number position of the specified character. String str = "hare krishna hare krishna krishna krishna hare hare"; int prabhu = str.indexOf('h'), heram; System.out.println("Index of 'h' in String 'str' is: " + prabhu); System.out.println("Index of 'k' in String 'str' is: " + str.indexOf("k")); //For a word or sequence of charaters, method returns the index location of letter with which the word starts. System.out.println("Index of 'krishna' in String 'str' is: " + str.indexOf("krishna")); } } Output of the program:- ----------------------- Index of 'h' in String 'str' is: 0 Index of 'k' in String 'str' is: 5 Index of 'krishna' in String 'str' is: 5