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Articles by Samual Sam
Page 73 of 151
Overflow of DataTypes in Java
Overflow occurs when the given value is more than the maximum prescribed size of a data type. The overflow condition can result to an error or now the implementation of the programming language handles it on its own.To display overflow of datatypes, I have taken an example of float datatype. Float data type is a single-precision 32-bit IEEE 754 floating point.The range of a float datatype is −approximately ±3.40282347E+38FThe following program display overflow of datatypes in Java.Examplepublic class Demo { public static void main(String[] args) { System.out.println("Displaying Overflow... "); float val1 = 3.3976835E38f; ...
Read MoreCheck if a String is whitespace, empty ("") or null in Java
Let’s say the following is our string.String myStr = "";Now, we will check whether the above string is whitespace, empty ("") or null.if(myStr != null && !myStr.isEmpty() && !myStr.trim().isEmpty()) { System.out.println("String is not null or not empty or not whitespace"); } else { System.out.println("String is null or empty or whitespace"); }The following is an example that checks for an empty string.Examplepublic class Demo { public static void main(String[] args) { String myStr = ""; if(myStr != null && !myStr.isEmpty() && !myStr.trim().isEmpty()) { System.out.println("String is not null or ...
Read MoreDisplay time zone with SimpleDateFormat("z") in Java
You can display timezone easily in Java using SimpleDateFormat(“z”).Firstly, to work with SimpleDateFormat class in Java, import the following package −import java.text.SimpleDateFormat;Now, set the format with SimpleDateFormat(“z”) to display timezone −Format f = new SimpleDateFormat(”z”);Now, get the timezone in a string −String strTimeZone = f.format(new Date());The following is an example −Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time Calendar cal = Calendar.getInstance(); ...
Read MoreJava Program to format date time with Join
To format date time with Join, set the date as a string and do not forget to add the delimeter.For delimeter “/” in the dateString.join("/","11","11","2018");For delimeter “:” in the date.String.join(":", "10","20","20");The following is an example.Examplepublic class Demo { public static void main(String[] args) { String d = String.join("/","11","11","2018"); System.out.print("Date: "+d); String t = String.join(":", "10","20","20"); System.out.println("Time: "+t); } }OutputDate: 11/11/2018 Time: 10:20:20
Read MoreJava Program to subtract long integers and check for overflow
To check for Long overflow, we need to check the Long.MAX_VALUE with the subtracted long result. Here, Long.MAX_VALUE is the maximum value of Long type in Java.Let us see an example wherein long integers are subtracted and if the result is still more than the Long.MAX_VALUE, then an exception is thrown −The following is an example showing how to check for Long overflow −Examplepublic class Demo { public static void main(String[] args) { long val1 = 70123; long val2 = 10567; ...
Read MoreJava Program to convert an int to a boolean specifying the conversion values
To convert int to boolean, let us first take the following int.int one = 1; int two = 1; int three = 0;We have nested if-else statement to display the true or false values. Here, the value “one” is the same as “two” i.e. 1; therefore, the following works −else if (one.equals(two)) { System.out.println(true); }The above display “true” and in this way we converted int to boolean.Let us now see the complete example to learn how to convert int to Boolean.Examplepublic class Demo { public static void main(String[] args) { int one = 1; ...
Read MoreCount how many times the substring appears in the larger String in Java
Let’s say we have the following string.String str = "Learning never ends! Learning never stops!";In the above string, we need to find out how many times the substring “Learning” appears.For this, loop until the index is not equal to 1 and calculate.while ((index = str.indexOf(subString, index)) != -1) { subStrCount++; index = index + subString.length(); }The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str = "Learning never ends! Learning never stops!"; System.out.println("String: "+str); int subStrCount = 0; String subString = ...
Read MoreJava Program to display double and single quote in a string
The following are our strings with single and double quote.String str1 = "This is Jack's mobile"; String str2 = ""This is it"!";Above, for single quote, we have to mention it normally like.This is Jack's mobileHowever, for double quotes, use the following and add a slash in the beginning as well as at the end.String str2 = ""This is it"!";The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str1 = "This is Jack's mobile"; String str2 = ""This is it"!"; System.out.println("Displaying Single Quote: "+str1); ...
Read MoreJava Program to split a string with dot
Let’s say the following is our string.String str = "Java is a programming language. James Gosling developed it.";We will now see how to split a string using the split() method. Include the delimiter as the parameter.String[] strSplit = str.split("\.");Above, we have split the string with dot as you can see under the split methods parameter.The following is an example.Examplepublic class Demo { public static void main(String[] args) { String str = "Java is a programming language. James Gosling developed it."; System.out.println("String: "+str); String[] strSplit = str.split("\."); System.out.println("Splitting ...
Read MoreDisplay hour in KK (00-11) format in Java
The “KK” format in Java Date is used to display hour in 00-11.. Use SimpleDateFormat("KK") to get the same format −// displaying hour in KK format SimpleDateFormat simpleformat = new SimpleDateFormat("KK"); String strHour = simpleformat.format(new Date()); System.out.println("Hour in KK format = "+strHour);Above, we have used the SimpleDateFormat class, therefore the following package is imported −import java.text.SimpleDateFormat;The following is an example −Exampleimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public class Demo { public static void main(String[] args) throws Exception { // displaying current date and time ...
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