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Java Articles
Page 5 of 450
StringTokenizer class in Java
The StringTokenizer class of the java.util package allows an application to break a string into tokens.This class is a legacy class that is retained for compatibility reasons although its use is discouraged in new code.Its methods do not distinguish among identifiers, numbers, and quoted strings.This class methods do not even recognize and skip comments.Exampleimport java.util.*; public class Sample { public static void main(String[] args) { // creating string tokenizer StringTokenizer st = new StringTokenizer("Come to learn"); // checking next token System.out.println("Next token is : " + st.nextToken()); } }OutputNext token is : Come
Read MoreStringTokenizer class in Java
The StringTokenizer class of the java.util package allows an application to break a string into tokens.This class is a legacy class that is retained for compatibility reasons although its use is discouraged in new code.Its methods do not distinguish among identifiers, numbers, and quoted strings.This class methods do not even recognize and skip comments.Exampleimport java.util.*; public class Sample { public static void main(String[] args) { // creating string tokenizer StringTokenizer st = new StringTokenizer("Come to learn"); // checking next token System.out.println("Next token is : " + st.nextToken()); } }OutputNext token is : Come
Read MoreJava String toCharArray() method example.
The toCharArray() method of a String class converts this string to a character array.Exampleimport java.lang.*; public class StringDemo { public static void main(String[] args) { // converts String value to character array type value String str = " Java was developed by James Gosling"; char retval[] = str.toCharArray(); // displays the converted value System.out.println("Converted value to character array = "); System.out.println(retval); } }OutputConverted value to character array = Java was developed by James Gosling
Read MoreHow to test String is null or empty?
We can verify whether the given string is empty using the isEmpty() method of the String class. This method returns true only if length() is 0.Exampleimport java.lang.*; public class StringDemo { public static void main(String[] args) { String str = "tutorialspoint"; // prints length of string System.out.println("length of string = " + str.length()); // checks if the string is empty or not System.out.println("is this string empty? = " + str.isEmpty()); } }Outputlength of string = 14 is this string empty? = false
Read MoreHow to Split a String with Escaped Delimiters?
The split(String regex) method of the String class splits this string around matches of the given regular expression.Examplepublic class Sample{ public static void main(String args[]){ String s = "|A|BB||CCC|||"; String[] words = s.split("\|"); for (String string : words) { System.out.println(string); } } }OutputA BB CCC
Read MoreJava string case change sample code examples.
You can change the cases using the toUpperCase() and toLowerCase() methods of the String class.Examplepublic class Sample { public static void main(String args[]){ String str = "Hello how are you"; String strUpper = str.toUpperCase(); System.out.println("Lower to upper : "+strUpper); String strLower = str.toLowerCase(); System.out.println("Upper to lower : "+strLower); } }OutputLower to upper : HELLO HOW ARE YOU Upper to lower : hello how are you
Read MoreData Conversion Using valueOf() In Java.
Java String class provides several variants of valueOf() method. These accept various data types and convert them into String.Examplepublic class Sample { public static void main(String args[]){ int i = 200; float f = 12.0f; char c = 's'; char[] ch = {'h', 'e', 'l', 'l', 'o'}; String data = String.valueOf(i); System.out.println(String.valueOf(i)); System.out.println(String.valueOf(f)); System.out.println(String.valueOf(c)); System.out.println(String.valueOf(ch)); } }Output200 12.0 s hello
Read MoreHow to Convert Double to String to Double in Java?
Java lang package provides a Double class which has methods to convert Double to String and vice versa. You can convert a String to a double using the parseDouble() method and double to String using the toString() methodExamplepublic class StringDouble { public static void main(String args[]){ Double data1 = 2.2; String str = Double.toString(data1); System.out.println(str); Double data2 = Double.parseDouble(str); System.out.println(data2); } }Output2.2 2.2
Read MoreHow to write Java program to add two matrices
To add two matrices −Create an empty matrixAt each position in the new matrix, assign the sum of the values in the same position from the given two matrices i.e. if A[i][j] and B[i][j] are the two given matrices then, the value of c[i][j] should be A[i][j] + B[i][j]Examplepublic class AddingTwoMatrices{ public static void main(String args[]){ int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int b[][]={{1,1,1},{1,1,1},{1,1,1}}; int c[][]=new int[3][3]; for(int i = 0;i
Read MoreHow to write Java program to add two matrices
To add two matrices −Create an empty matrixAt each position in the new matrix, assign the sum of the values in the same position from the given two matrices i.e. if A[i][j] and B[i][j] are the two given matrices then, the value of c[i][j] should be A[i][j] + B[i][j]Examplepublic class AddingTwoMatrices{ public static void main(String args[]){ int a[][]={{1,2,3},{4,5,6},{7,8,9}}; int b[][]={{1,1,1},{1,1,1},{1,1,1}}; int c[][]=new int[3][3]; for(int i = 0;i
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