This Java Tutorial is complete coverage of Java Basics Tutorial , Java String Tutorial, Java Array Tutorial , Java Swing Tutorial , and Java Applet. Tutorial . . .
Introduction : The JOptionPane class in the javax.swing package. A class used to create any number of different types of dialog boxes, including attention dialogs, yes/no dialogs, and input dialogs. showMessageDialog () : showMessageDialog( Component parent, Object message) This displays a modal dialog with the default title “Message”. The first argument is the parent for … Read more…
new String vs String literals When you create String object using new operator, it always create a new object in heap(one of memory section). On the other hand, if you create object using string literal, it may return an existing object from String pool(one of memory section), if it’s already exists. Otherwise it will create a … Read more…
Get Substring A substring is a part of another string. For example, the strings “123” and “45” are substrings of the string “12345”. The subString( ) method of the String class enables us to extract the substrings from a string. A substring( ) method of the form substring( int startIndex, int endIndex-1 ) will return a … Read more…
Get Position The indexOf( ) method provides the position of a specific character in the given string. For example, in the following program, the indexOf( ) method will return ‘2‘ as the answer. This method has returned the position of first occurrence of the specified character. There is one more method known as the lastIndexOf( … Read more…
Trimming To remove whitespace from the beginning and end of a string (but not the interior) you can use the trim( ) method. Program Program Source public class Javaapp { public static void main(String[] args){ String str1 = new String(” haj sof “); System.out.println(str1); System.out.println(“str1.length = “+str1.length()); str1 = str1.trim(); System.out.println(str1); System.out.println(“str1.length = “+str1.length()); } … Read more…
Startswith and Endswith The String class provides two more methods that are specialized versions of the equals( ) method. The startWith( ) method enables us to check whether a given string str1 starts with another string str2. For example, in the following program, the startWith( ) method will return true as the string “hajsoftutorial” starts … Read more…