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In Java, there are different ways to convert byte to string.Using toString() method, you can easily convert byte to string as shown below −Example Live Demopublic class Demo { public static void main(String[] args) { byte res = 87; // byte to string System.out.println(Byte.toString(res)); } }Output87In the above example, we have taken a byte value.byte res = 87;With that, to convert to string, the method toString() is used as shown below −Byte.toString(res);Let us see another example to convert byte to string.Example Live Demopublic class Demo { public static void main(String[] ... Read More
To compare two Byte Arrays, use the Arrays.equals() method. Here we have declared and initialized a total of 4 arrays.byte[] arr1 = new byte[] { 11, 13, 30, 45, 77, 89 }; byte[] arr2 = new byte[] { 12, 13, 34, 87, 99, 33}; byte[] arr3 = new byte[] { 11, 13, 30, 45, 77, 89 }; byte[] arr4 = new byte[] { 13, 16, 56, 78, 98, 99 };Now, using the Arrays.equals() method, we will be compare two arrays.Arrays.equals(arr1, arr2);In the same way, other arrays would be compared one by one.Let us see the complete example to compare two ... Read More
You can add auto_increment to a column in MySQL database with the help of ALTER command.The syntax is as follows −ALTER TABLE yourTableName MODIFY yourColumnName INT NOT NULL AUTO_INCREMENT;To open PhpMyAdmin on localhost, you need to type the following on localhost and press enter −localhost/phpmyadminThe screenshot is as follows −Above, we already have a table “AutoIncrementDemo”. In that, we have a column “UserId” set as Primary key. Let’s say we need to add auto_increment to the same column.For auto_increment, check the A.I as shown above. The same is marked below as well −After that press the Save button.Let us also ... Read More
Firstly, let us declare byte values.byte val1 = 127; byte val2 = -128;To convert the above given unsigned byte, you can use the following. Here, we are first implementing it for the variable “val1”.(int) val1 & 0xFFNow for the second variable “val2”.(int) val2 & 0xFFLet us see the complete example to convert an UNSIGNED bye to a JAVA type.Example Live Demoimport java.util.*; public class Demo { public static void main(String[] args) { byte val1 = 127; byte val2 = -128; System.out.println(val1); System.out.println((int) val1 & 0xFF); System.out.println(val2); System.out.println((int) val2 & 0xFF); } }Output127 127 -128 128
To convert a byte to hexadecimal equivalent, use the toHexString() method in Java.Firstly, let us take a byte value.byte val1 = (byte)90;Before using the method, let us do some more manipulations. Mask the byte value now:int res = val1 & 0xFF;Let us now see the complete example and use the toHexString() method to convert a byte to hexadecimal equivalent.Example Live Demopublic class Demo { public static void main(String[] args) { byte val1 = (byte)90; System.out.println("Byte = "+val1); int res = val1 & 0xFF; System.out.println("Hexadecimal = "+Integer.toHexString(res)); } }OutputByte = 90 Hexadecimal = 5a
The method Integer.lowestOneBit() returns an int value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit in the specified int value.Here we have a decimal value 294, whose binary is −100100110The lowest one bit is calculated using the lowestOneBit() method in Java.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)); System.out.println("Lowest one bit: " + Integer.lowestOneBit(dec)); } }OutputCount of one bits = 4 Lowest one bit: 2
To check for Integer overflow, we need to check the Integer.MAX_VALUE with the multiplied integers result, Here, Integer.MAX_VALUE is the maximum value of an integer in Java.Let us see an example wherein integers are multiplied and if the result is more than the Integer.MAX_VALUE, then an exception is thrown.The following is an example showing how to check for Integer overflow.Example Live Demopublic class Demo { public static void main(String[] args) { int val1 = 9898; int val2 = 6784; System.out.println("Value1: "+val1); System.out.println("Value2: "+val2); long mul ... Read More
To check whether a character is in Lowercase or not in Java, use the Character.isLowerCase() method.We have a character to be checked.char val = 'q';Now let us use the Character.isLowerCase() method.if (Character.isLowerCase(val)) { System.out.println("Character is in Lowercase!"); }else { System.out.println("Character is in Uppercase!"); }Let us see the complete example now to check for Lowercase in Java.Example Live Demopublic class Demo { public static void main(String []args) { System.out.println("Checking for Lowercase character..."); char val = 'q'; System.out.println("Character: "+val); if (Character.isLowerCase(val)) { System.out.println("Character is ... Read More
The following is the syntax to check whether a table is empty or not using MySQL EXISTS −SELECT EXISTS(SELECT 1 FROM yourTableName);ExampleFirst, let us create a table. The query to create a table is as follows −mysql> create table ReturnDemo -> ( -> Id int, -> Name varchar(10) -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ReturnDemo values(100, 'Larry'); Query OK, 1 row affected (0.18 sec) mysql> insert into ReturnDemo values(101, 'Bob'); Query OK, 1 row affected (0.28 sec) ... Read More
To convert integer to boolean, firstly let us initialize an integer.int val = 100;Now we will declare a variable with primitive boolean. While declaration, we will initialize it with the val value comparing it with an integer using the == operator. If the value matches, the value “True” is returned, else “False” is returned.boolean bool = (val == 100);Let us now see the complete example displaying how to convert integer to boolean.Example Live Demopublic class Demo { public static void main(String[] args) { int val = 100; System.out.println("Integer: "+val); boolean bool ... Read More