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To create a Boolean object from Boolean value is quite easy. Create an object with Boolean and set the Boolean value “true” or “false”, which are the Boolean literals.Let us now see how “true” value is added.Boolean bool = new Boolean("true");In the same way, “False” value is added.Boolean bool = new Boolean("false");The following is an example displaying how to create a Boolean object from Boolean value.Example Live Demopublic class Demo { public static void main(String[] args) { Boolean bool = new Boolean("true"); System.out.println(bool); bool = new Boolean("false"); System.out.println(bool); ... Read More
To read integers from console, use Scanner class.Scanner myInput = new Scanner( System.in );Allow a use to add an integer using the nextInt() method.System.out.print( "Enter first integer: " ); int a = myInput.nextInt();In the same way, take another input in a new variable.System.out.print( "Enter second integer: " ); Int b = myInput.nextInt();Let us see the complete example.Exampleimport java.util.Scanner; public class Demo { public static void main( String args[] ) { Scanner myInput = new Scanner( System.in ); int a; int b; int sum; System.out.print( ... Read More
To convert Short to numeric primitive data types, use the following methods −byteValue() shortValue() intValue() longValue() floatValue()Firstly, let us declare a Short.Short shortObj = new Short("40");Now, let us see how to convert it to long type, for a simple example.long val5 = shortObj.longValue(); System.out.println("Long: "+val5);In the same way, you can convert it to other primitive data types as shown in the complete example below.Example Live Demopublic class Demo { public static void main(String []args) { Short shortObj = new Short("40"); byte val1 = shortObj.byteValue(); System.out.println("Byte: "+val1); int val2 ... Read More
To convert byte primitive type to Byte object, use the Byte constructor.Here is our byte primitive type.byte b = 100;Now let us convert it to Byte object.Byte res = new Byte(b);Let us see the complete example.Example Live Demopublic class Demo { public static void main(String[] args) { byte b = 100; Byte res = new Byte(b); System.out.println(res); } }Output100
You can combine date and time from different MySQL columns to compare with the entire date time with the help of CONCAT() function. The syntax is as follows −SELECT *FROM yourTableName WHERE CONCAT(yourDateColumnName, '', yourTimeColumnName) > 'yourDateTimeValue';To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table DifferentDateTime -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ArrivalDate date, -> ArrivalTime time -> ); Query OK, 0 rows affected (1.53 sec)Insert some records in the table using ... Read More
Let’s say we have the following decimal number, which is binary 100100110.int dec = 294;To perform bit manipulation, let us count the number of 1 bits in it. We have used bitCount() method for this purpose.Integer.bitCount(dec);The following is an example to display bit manipulation in given Integer.Example Live Demopublic class Demo { public static void main(String []args) { // binary 100100110 int dec = 294; System.out.println("Count of one bits = " + Integer.bitCount(dec)); } }OutputCount of one bits = 4
To fetch rows where a field value is less than 5 chars, you need to use LENGTH() function. The syntax is as follows −SELECT *FROM yourTableName WHERE LENGTH(yourColumnName) < 5;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table fieldLessThan5Chars -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> yourZipCode varchar(10) -> ); Query OK, 0 rows affected (0.52 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into fieldLessThan5Chars(yourZipCode) values('35801'); Query ... Read More
You can easily add more than one column that does not exist in a query using multiple AS keywords.Let us first create a table. The query to create a table is as follows −mysql> create table ColumnDoesNotExists -> ( -> UserId int, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ColumnDoesNotExists(UserId, UserName) values(100, 'Larry'); Query OK, 1 row affected (0.14 sec) mysql> insert into ColumnDoesNotExists(UserId, UserName) values(101, 'Sam'); Query OK, 1 row affected (0.22 sec) mysql> ... Read More
Every data type in Java has a minimum as well as maximum range, for example, for Integer.Minimum = -2147483648 Maximum = 2147483647Let’s say for Integer, if the value extends the maximum range display above, it leads to Overflow. However, if the value is less than the minimum range displayed above, it leads to Underflow.The following program displays the limits on datatypes in Java.Example Live Demopublic class Demo { public static void main(String[] args) { System.out.println("Limits of primitive DataTypes"); System.out.println("Byte Datatype values..."); System.out.println("Min = " + Byte.MIN_VALUE); System.out.println("Max = ... Read More
To display default initial values of a datatype, you need to just declare a variable of the same datatype and display it.The following is a Java program to display initial values of DataTypes.Example Live Demopublic class Demo { boolean t; byte b; short s; int i; long l; float f; double d; void Display() { System.out.println("boolean (Initial Value) = " + t); System.out.println("byte (Initial Value) = " + b); System.out.println("short (Initial Value) = " + s); System.out.println("int (Initial Value) = " ... Read More