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Programming Articles
Page 21 of 2546
Write a java program to tOGGLE each word in string?
You can change the cases of the letters of a word using toUpperCase() and toLowerCase() methods.Split each word in the string using the split() method, change the first letter of each word to lower case and remaining letters to upper case.Examplepublic class Sample{ public static void main(String args[]){ String sample = "Hello How are you"; String[] words = sample.split(" "); String result = ""; for(String word:words){ String firstSub = word.substring(0, 1); String secondSub = word.substring(1); result = result+firstSub.toLowerCase()+secondSub.toUpperCase()+" "; } System.out.println(result); } }OutputhELLO hOW aRE yOU
Read MoreCheck if a string contains a number using Java.
To find whether a given string contains a number, convert it to a character array and find whether each character in the array is a digit using the isDigit() method of the Character class.Examplepublic class ContainsExample { public static void main(String args[]){ String sample = "krishna64"; char[] chars = sample.toCharArray(); StringBuilder sb = new StringBuilder(); for(char c : chars){ if(Character.isDigit(c)){ sb.append(c); } } System.out.println(sb); } }Output64
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 MoreA closer look at Java "Hello World" program
Let us look at a simple code that will print the words Hello World.Examplepublic class MyFirstJavaProgram { /* This is my first java program. * This will print 'Hello World' as the output */ public static void main(String []args) { System.out.println("Hello World"); // prints Hello World } }Let's look at how to save the file, compile, and run the program. Please follow the subsequent steps −Open notepad and add the code as above.Save the file as: MyFirstJavaProgram.java.Open a command prompt window and go to the directory where you saved the class. Assume it's ...
Read MoreWhy can't we define a static method in a Java interface?
From Java 8 onwards, static methods are allowed in Java interfaces.An interface can also have static helper methods from Java 8 onwards. public interface vehicle { default void print() { System.out.println("I am a vehicle!"); } static void blowHorn() { System.out.println("Blowing horn!!!"); } }Default Method ExampleCreate the following Java program using any editor of your choice in, say, C:\> JAVA.Java8Tester.javapublic class Java8Tester { public static void main(String args[]) { Vehicle vehicle = new Car(); vehicle.print(); } } interface Vehicle { default void print() { ...
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